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Data Structure II

Day 1 Array
0136 Single Number Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) 1 99.86
0169 Majority Element Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 1 99.89
0015 3Sum Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 29 72.02

Day 2 Array
0075 Sort Colors Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 0 100.00
0056 Merge Intervals Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) 7 98.37
0706 Design HashMap Easy Array, Hash_Table, Design, Linked_List, Hash_Function 13 95.71

Day 3 Array
0119 Pascal’s Triangle II Easy Array, Dynamic_Programming 0 100.00
0048 Rotate Image Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) 0 100.00
0059 Spiral Matrix II Medium Array, Matrix, Simulation 0 100.00

Day 4 Array
0240 Search a 2D Matrix II Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1) 5 99.92
0435 Non-overlapping Intervals Medium Array, Dynamic_Programming, Sorting, Greedy 96 47.37

Day 5 Array
0334 Increasing Triplet Subsequence Medium Array, Greedy 2 99.33
0238 Product of Array Except Self Medium Top_100_Liked_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n) 1 99.66
0560 Subarray Sum Equals K Medium Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Big_O_Time_O(n)_Space_O(n) 22 95.17

Day 6 String
0415 Add Strings Easy String, Math, Simulation 3 82.41
0409 Longest Palindrome Easy String, Hash_Table, Greedy 2 92.90

Day 7 String
0290 Word Pattern Easy String, Hash_Table 1 97.26
0763 Partition Labels Medium String, Hash_Table, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 2 100.00

Day 8 String
0049 Group Anagrams Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n) 6 97.61
0043 Multiply Strings Medium String, Math, Simulation 1 100.00

Day 9 String
0187 Repeated DNA Sequences Medium String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash 29 77.11
0005 Longest Palindromic Substring Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 7 97.82

Day 10 Linked List
0002 Add Two Numbers Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M)), AI_can_be_used_to_solve_the_task 1 100.00
0142 Linked List Cycle II Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00

Day 11 Linked List
0160 Intersection of Two Linked Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1) 1 99.92
0082 Remove Duplicates from Sorted List II Medium Two_Pointers, Linked_List 0 100.00

Day 12 Linked List
0024 Swap Nodes in Pairs Medium Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 0 100.00
0707 Design Linked List Medium Design, Linked_List 10 70.60

Day 13 Linked List
0025 Reverse Nodes in k-Group Hard Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k) 0 100.00
0143 Reorder List Medium Two_Pointers, Stack, Linked_List, Recursion 2 72.59

Day 14 Stack Queue
0155 Min Stack Medium Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 4 96.54
1249 Minimum Remove to Make Valid Parentheses Medium String, Stack 13 94.62
1823 Find the Winner of the Circular Game Medium Array, Math, Simulation, Recursion, Queue 3 64.85

Day 15 Tree
0108 Convert Sorted Array to Binary Search Tree Easy Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer 0 100.00
0105 Construct Binary Tree from Preorder and Inorder Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Big_O_Time_O(N)_Space_O(N) 1 96.33
0103 Binary Tree Zigzag Level Order Traversal Medium Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree 1 95.00

Day 16 Tree
0199 Binary Tree Right Side View Medium Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 94.57
0113 Path Sum II Medium Depth_First_Search, Tree, Binary_Tree, Backtracking 1 100.00
0450 Delete Node in a BST Medium Tree, Binary_Tree, Binary_Search_Tree 0 100.00

Day 17 Tree
0230 Kth Smallest Element in a BST Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0173 Binary Search Tree Iterator Medium Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator 18 84.18

Day 18 Tree
0236 Lowest Common Ancestor of a Binary Tree Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 6 100.00
0297 Serialize and Deserialize Binary Tree Hard String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design 7 98.13

Day 19 Graph
0997 Find the Town Judge Easy Array, Hash_Table, Graph 3 80.64
1557 Minimum Number of Vertices to Reach All Nodes Medium Graph 8 99.94
0841 Keys and Rooms Medium Depth_First_Search, Breadth_First_Search, Graph 3 51.54

Day 20 Heap Priority Queue
0215 Kth Largest Element in an Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Big_O_Time_O(n*log(n))_Space_O(log(n)) 5 70.82
0347 Top K Frequent Elements Medium Top_100_Liked_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Big_O_Time_O(n*log(n))_Space_O(k) 9 97.30

Day 21 Heap Priority Queue
0451 Sort Characters By Frequency Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort 13 89.63
0973 K Closest Points to Origin Medium Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect 4 98.26

Algorithm I
0704 Binary Search Easy Top_100_Liked_Questions, Array, Binary_Search 0 100.00
0278 First Bad Version Easy Binary_Search, Interactive 15 87.89
0035 Search Insert Position Easy Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00

Day 2 Two Pointers
0977 Squares of a Sorted Array Easy Array, Sorting, Two_Pointers 1 100.00
0189 Rotate Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 0 100.00

Day 3 Two Pointers
0283 Move Zeroes Easy Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 2 83.99
0167 Two Sum II - Input Array Is Sorted Medium Array, Binary_Search, Two_Pointers 1 99.21

Day 4 Two Pointers
0344 Reverse String Easy String, Two_Pointers, Recursion 1 99.91
0557 Reverse Words in a String III Easy String, Two_Pointers 4 97.75

Day 5 Two Pointers
0876 Middle of the Linked List Easy Two_Pointers, Linked_List 0 100.00
0019 Remove Nth Node From End of List Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L) 0 100.00

Day 6 Sliding Window
0003 Longest Substring Without Repeating Characters Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task 2 98.59
0567 Permutation in String Medium Top_100_Liked_Questions, String, Hash_Table, Two_Pointers, Sliding_Window 5 93.93
0733 Flood Fill Easy Array, Depth_First_Search, Breadth_First_Search, Matrix 1 85.36
0695 Max Area of Island Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 3 76.79
0617 Merge Two Binary Trees Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 72.47
0116 Populating Next Right Pointers in Each Node Medium Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List 0 100.00
0542 01 Matrix Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix 7 95.83
0994 Rotting Oranges Medium Top_100_Liked_Questions, Array, Breadth_First_Search, Matrix 3 74.27

Day 10 Recursion Backtracking
0021 Merge Two Sorted Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 0 100.00
0206 Reverse Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 0 100.00

Day 11 Recursion Backtracking
0077 Combinations Medium Backtracking 11 77.40
0046 Permutations Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!) 1 94.08
0784 Letter Case Permutation Medium String, Bit_Manipulation, Backtracking 10 40.38

Day 12 Dynamic Programming
0070 Climbing Stairs Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 0 100.00
0198 House Robber Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 0 100.00
0120 Triangle Medium Array, Dynamic_Programming 2 94.63

Day 13 Bit Manipulation
0231 Power of Two Easy Math, Bit_Manipulation, Recursion 1 100.00
0191 Number of 1 Bits Easy Top_Interview_Questions, Bit_Manipulation 1 84.87

Day 14 Bit Manipulation
0190 Reverse Bits Easy Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer 1 98.66
0136 Single Number Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) 1 99.86

Algorithm II

Day 1 Binary Search
0034 Find First and Last Position of Element in Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0033 Search in Rotated Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 0 100.00
0153 Find Minimum in Rotated Sorted Array Medium Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 0 100.00
0162 Find Peak Element Medium Top_Interview_Questions, Array, Binary_Search 0 100.00

Day 3 Two Pointers
0082 Remove Duplicates from Sorted List II Medium Two_Pointers, Linked_List 0 100.00
0015 3Sum Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 29 72.02

Day 4 Two Pointers
0844 Backspace String Compare Easy String, Two_Pointers, Stack, Simulation 0 100.00
0986 Interval List Intersections Medium Array, Two_Pointers 2 99.95
0011 Container With Most Water Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 3 96.01

Day 5 Sliding Window
0438 Find All Anagrams in a String Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) 3 99.83
0713 Subarray Product Less Than K Medium Array, Sliding_Window 8 39.00
0209 Minimum Size Subarray Sum Medium Array, Binary_Search, Prefix_Sum, Sliding_Window 1 100.00
0200 Number of Islands Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 3 87.24
0547 Number of Provinces Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 2 69.51

Day 7 Breadth First Search Depth First Search
0117 Populating Next Right Pointers in Each Node II Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List 0 100.00
0572 Subtree of Another Tree Easy Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching 2 97.06

Day 8 Breadth First Search Depth First Search
1091 Shortest Path in Binary Matrix Medium Array, Breadth_First_Search, Matrix 22 69.99
0130 Surrounded Regions Medium Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 2 84.66
0797 All Paths From Source to Target Medium Depth_First_Search, Breadth_First_Search, Graph, Backtracking 2 90.53

Day 9 Recursion Backtracking
0078 Subsets Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n) 0 100.00
0090 Subsets II Medium Array, Bit_Manipulation, Backtracking 2 82.94

Day 10 Recursion Backtracking
0047 Permutations II Medium Array, Backtracking 1 99.86
0039 Combination Sum Medium Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) 1 99.99
0040 Combination Sum II Medium Array, Backtracking 2 99.75

Day 11 Recursion Backtracking
0017 Letter Combinations of a Phone Number Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n) 0 100.00
0022 Generate Parentheses Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n) 0 100.00
0079 Word Search Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n) 64 98.51

Day 12 Dynamic Programming
0213 House Robber II Medium Array, Dynamic_Programming 0 100.00
0055 Jump Game Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 1 100.00

Day 13 Dynamic Programming
0045 Jump Game II Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 0 100.00
0062 Unique Paths Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n) 0 100.00

Day 14 Dynamic Programming
0005 Longest Palindromic Substring Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 7 97.82
0413 Arithmetic Slices Medium Array, Dynamic_Programming 0 100.00

Day 15 Dynamic Programming
0091 Decode Ways Medium Top_Interview_Questions, String, Dynamic_Programming 2 66.37
0139 Word Break Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 1 99.42

Day 16 Dynamic Programming
0300 Longest Increasing Subsequence Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 3 95.75
0673 Number of Longest Increasing Subsequence Medium Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree 25 68.75

Day 17 Dynamic Programming
1143 Longest Common Subsequence Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 19 89.05
0583 Delete Operation for Two Strings Medium String, Dynamic_Programming 12 79.10

Day 18 Dynamic Programming
0072 Edit Distance Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 3 97.19
0322 Coin Change Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount) 12 92.59
0343 Integer Break Medium Dynamic_Programming, Math 0 100.00

Day 19 Bit Manipulation
0201 Bitwise AND of Numbers Range Medium Bit_Manipulation 8 74.15

Day 20 Others
0384 Shuffle an Array Medium Array, Math, Randomized 52 91.77

Day 21 Others
0202 Happy Number Easy Top_Interview_Questions, Hash_Table, Math, Two_Pointers 1 98.59
0149 Max Points on a Line Hard Top_Interview_Questions, Array, Hash_Table, Math, Geometry 11 99.21

Binary Search I

Day 1
0704 Binary Search Easy Top_100_Liked_Questions, Array, Binary_Search 0 100.00
0374 Guess Number Higher or Lower Easy Binary_Search, Interactive 0 100.00

Day 2
0035 Search Insert Position Easy Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0852 Peak Index in a Mountain Array Medium Array, Binary_Search 0 100.00

Day 3
0367 Valid Perfect Square Easy Math, Binary_Search 0 100.00
1385 Find the Distance Value Between Two Arrays Easy Array, Sorting, Binary_Search, Two_Pointers 5 65.78

Day 4
0069 Sqrt(x) Easy Top_Interview_Questions, Math, Binary_Search 1 99.51
0744 Find Smallest Letter Greater Than Target Easy Array, Binary_Search 0 100.00

Day 5
0278 First Bad Version Easy Binary_Search, Interactive 15 87.89
0034 Find First and Last Position of Element in Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00

Day 6
0441 Arranging Coins Easy Math, Binary_Search 2 95.97
1539 Kth Missing Positive Number Easy Array, Binary_Search 0 100.00

Day 7
0167 Two Sum II - Input Array Is Sorted Medium Array, Binary_Search, Two_Pointers 1 99.21
1608 Special Array With X Elements Greater Than or Equal X Easy Array, Sorting, Binary_Search 2 61.14

Day 8
1351 Count Negative Numbers in a Sorted Matrix Easy Array, Binary_Search, Matrix 1 49.66
0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 0 100.00

Day 9
1337 The K Weakest Rows in a Matrix Easy Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue 1 99.77
1346 Check If N and Its Double Exist Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 1 99.64

Day 10
0350 Intersection of Two Arrays II Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 4 69.62
0633 Sum of Square Numbers Medium Math, Binary_Search, Two_Pointers 4 82.92

Day 11
1855 Maximum Distance Between a Pair of Values Medium Array, Greedy, Binary_Search, Two_Pointers 4 62.20
0033 Search in Rotated Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00

Day 12
0153 Find Minimum in Rotated Sorted Array Medium Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 0 100.00

Binary Search II

Day 1
0209 Minimum Size Subarray Sum Medium Array, Binary_Search, Prefix_Sum, Sliding_Window 1 100.00
0611 Valid Triangle Number Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers 10 100.00

Day 2
0658 Find K Closest Elements Medium Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue 3 99.20
1894 Find the Student that Will Replace the Chalk Medium Array, Binary_Search, Simulation, Prefix_Sum 2 76.67

Day 3
0300 Longest Increasing Subsequence Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 3 95.75
1760 Minimum Limit of Balls in a Bag Medium Array, Binary_Search 44 78.49

Day 4
0875 Koko Eating Bananas Medium Array, Binary_Search 15 91.32
1552 Magnetic Force Between Two Balls Medium Array, Sorting, Binary_Search 39 99.65

Day 5
0287 Find the Duplicate Number Medium Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Big_O_Time_O(n)_Space_O(n) 2 97.52
1283 Find the Smallest Divisor Given a Threshold Medium Array, Binary_Search 9 95.49

Day 6
1898 Maximum Number of Removable Characters Medium Array, String, Binary_Search 121 72.51
1870 Minimum Speed to Arrive on Time Medium Array, Binary_Search 86 88.58

Day 7
1482 Minimum Number of Days to Make m Bouquets Medium Array, Binary_Search 25 69.18
1818 Minimum Absolute Sum Difference Medium Array, Sorting, Binary_Search, Ordered_Set 13 99.44

Day 8
0240 Search a 2D Matrix II Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Big_O_Time_O(n+m)_Space_O(1) 5 99.92
0275 H-Index II Medium Array, Binary_Search 0 100.00

Day 9
1838 Frequency of the Most Frequent Element Medium Array, Sorting, Greedy, Binary_Search, Prefix_Sum, Sliding_Window 11 100.00
0540 Single Element in a Sorted Array Medium Array, Binary_Search 0 100.00

Day 10
0222 Count Complete Tree Nodes Easy Depth_First_Search, Tree, Binary_Search, Binary_Tree 0 100.00
1712 Ways to Split Array Into Three Subarrays Medium Array, Binary_Search, Two_Pointers, Prefix_Sum 16 84.24

Day 11
0826 Most Profit Assigning Work Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers 21 83.83
0436 Find Right Interval Medium Array, Sorting, Binary_Search 20 81.51

Day 12
0081 Search in Rotated Sorted Array II Medium Array, Binary_Search 1 82.83
0162 Find Peak Element Medium Top_Interview_Questions, Array, Binary_Search 0 100.00

Day 13
0154 Find Minimum in Rotated Sorted Array II Hard Array, Binary_Search 1 77.09
0528 Random Pick with Weight Medium Math, Binary_Search, Prefix_Sum, Randomized 42 50.90

Day 14
1508 Range Sum of Sorted Subarray Sums Medium Array, Sorting, Binary_Search, Two_Pointers 60 93.84
1574 Shortest Subarray to be Removed to Make Array Sorted Medium Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack 2 84.97

Day 15
1292 Maximum Side Length of a Square with Sum Less than or Equal to Threshold Medium Array, Binary_Search, Matrix, Prefix_Sum 23 32.97
1498 Number of Subsequences That Satisfy the Given Sum Condition Medium Array, Sorting, Binary_Search, Two_Pointers 27 99.13

Day 16
0981 Time Based Key-Value Store Medium String, Hash_Table, Binary_Search, Design 239 72.78
1300 Sum of Mutated Array Closest to Target Medium Array, Sorting, Binary_Search 7 33.33

Day 17
1802 Maximum Value at a Given Index in a Bounded Array Medium Greedy, Binary_Search 2 58.44
1901 Find a Peak Element II Medium Array, Binary_Search, Matrix, Divide_and_Conquer 0 100.00

Day 18
1146 Snapshot Array Medium Array, Hash_Table, Binary_Search, Design 68 45.86
1488 Avoid Flood in The City Medium Array, Hash_Table, Greedy, Binary_Search, Heap_Priority_Queue 82 75.08

Day 19
1562 Find Latest Group of Size M Medium Array, Binary_Search, Simulation 8 90.00
1648 Sell Diminishing-Valued Colored Balls Medium Array, Math, Sorting, Greedy, Binary_Search, Heap_Priority_Queue 27 80.64

Day 20
1201 Ugly Number III Medium Math, Binary_Search, Number_Theory 0 100.00
0911 Online Election Medium Array, Hash_Table, Binary_Search, Design 63 98.81

Dynamic Programming I

Day 1
0509 Fibonacci Number Easy Dynamic_Programming, Math, Recursion, Memoization 0 100.00
1137 N-th Tribonacci Number Easy Dynamic_Programming, Math, Memoization 0 100.00

Day 2
0070 Climbing Stairs Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 0 100.00
0746 Min Cost Climbing Stairs Easy Array, Dynamic_Programming 1 86.38

Day 3
0198 House Robber Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 0 100.00
0213 House Robber II Medium Array, Dynamic_Programming 0 100.00
0740 Delete and Earn Medium Array, Hash_Table, Dynamic_Programming 4 77.68

Day 4
0055 Jump Game Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 1 100.00
0045 Jump Game II Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 0 100.00

Day 5
0053 Maximum Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 1 99.32
0918 Maximum Sum Circular Subarray Medium Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue 3 92.86

Day 6
0152 Maximum Product Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 92.74
1567 Maximum Length of Subarray With Positive Product Medium Array, Dynamic_Programming, Greedy 4 80.86

Day 7
1014 Best Sightseeing Pair Medium Array, Dynamic_Programming 2 99.86
0121 Best Time to Buy and Sell Stock Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 99.78
0122 Best Time to Buy and Sell Stock II Medium Top_Interview_Questions, Array, Dynamic_Programming, Greedy 1 96.82

Day 8
0309 Best Time to Buy and Sell Stock with Cooldown Medium Array, Dynamic_Programming 0 100.00
0714 Best Time to Buy and Sell Stock with Transaction Fee Medium Array, Dynamic_Programming, Greedy 4 78.57

Day 9
0139 Word Break Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 1 99.42
0042 Trapping Rain Water Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1) 0 100.00

Day 10
0413 Arithmetic Slices Medium Array, Dynamic_Programming 0 100.00
0091 Decode Ways Medium Top_Interview_Questions, String, Dynamic_Programming 2 66.37

Day 11
0264 Ugly Number II Medium Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue 2 99.91
0096 Unique Binary Search Trees Medium Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(1) 0 100.00

Day 12
0118 Pascal’s Triangle Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming 1 67.08
0119 Pascal’s Triangle II Easy Array, Dynamic_Programming 0 100.00

Day 13
0931 Minimum Falling Path Sum Medium Array, Dynamic_Programming, Matrix 4 72.19
0120 Triangle Medium Array, Dynamic_Programming 2 94.63

Day 14
1314 Matrix Block Sum Medium Array, Matrix, Prefix_Sum 5 67.46
0304 Range Sum Query 2D - Immutable Medium Array, Matrix, Design, Prefix_Sum 153 87.51

Day 15
0062 Unique Paths Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n) 0 100.00
0063 Unique Paths II Medium Array, Dynamic_Programming, Matrix 0 100.00

Day 16
0064 Minimum Path Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n) 1 99.73
0221 Maximal Square Medium Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n) 6 97.07

Day 17
0005 Longest Palindromic Substring Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 7 97.82
0516 Longest Palindromic Subsequence Medium String, Dynamic_Programming 88 58.87

Day 18
0300 Longest Increasing Subsequence Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 3 95.75
0376 Wiggle Subsequence Medium Array, Dynamic_Programming, Greedy 0 100.00

Day 19
0392 Is Subsequence Easy String, Dynamic_Programming, Two_Pointers 1 93.01
1143 Longest Common Subsequence Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 19 89.05
0072 Edit Distance Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 3 97.19

Day 20
0322 Coin Change Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount) 12 92.59
0518 Coin Change 2 Medium Array, Dynamic_Programming 4 84.67

Day 21
0377 Combination Sum IV Medium Array, Dynamic_Programming 1 92.54
0343 Integer Break Medium Dynamic_Programming, Math 0 100.00
0279 Perfect Squares Medium Dynamic_Programming, Math, Breadth_First_Search 1 100.00

Programming Skills I

Day 1 Basic Data Type
1523 Count Odd Numbers in an Interval Range Easy Math 0 100.00
1491 Average Salary Excluding the Minimum and Maximum Salary Easy Array, Sorting 0 100.00

Day 2 Operator
0191 Number of 1 Bits Easy Top_Interview_Questions, Bit_Manipulation 1 84.87
1281 Subtract the Product and Sum of Digits of an Integer Easy Math 0 100.00

Day 3 Conditional Statements
0976 Largest Perimeter Triangle Easy Array, Math, Sorting, Greedy 12 26.01
1779 Find Nearest Point That Has the Same X or Y Coordinate Easy Array 1 100.00

Day 4 Loop
1822 Sign of the Product of an Array Easy Array, Math 1 58.05
1502 Can Make Arithmetic Progression From Sequence Easy Array, Sorting 2 90.55
0202 Happy Number Easy Top_Interview_Questions, Hash_Table, Math, Two_Pointers 1 98.59
1790 Check if One String Swap Can Make Strings Equal Easy String, Hash_Table, Counting 0 100.00

Day 5 Function
0589 N-ary Tree Preorder Traversal Easy Depth_First_Search, Tree, Stack 1 90.98
0496 Next Greater Element I Easy Array, Hash_Table, Stack, Monotonic_Stack 4 81.18
1232 Check If It Is a Straight Line Easy Array, Math, Geometry 0 100.00

Day 6 Array
1588 Sum of All Odd Length Subarrays Easy Array, Math, Prefix_Sum 0 100.00
0283 Move Zeroes Easy Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 2 83.99
1672 Richest Customer Wealth Easy Array, Matrix 0 100.00

Day 7 Array
1572 Matrix Diagonal Sum Easy Array, Matrix 0 100.00
0566 Reshape the Matrix Easy Array, Matrix, Simulation 1 90.08

Day 8 String
1768 Merge Strings Alternately Easy String, Two_Pointers 1 86.26
1678 Goal Parser Interpretation Easy String 0 100.00
0389 Find the Difference Easy String, Hash_Table, Sorting, Bit_Manipulation 1 100.00

Day 9 String
0709 To Lower Case Easy String 1 71.74
1309 Decrypt String from Alphabet to Integer Mapping Easy String 6 28.25
0953 Verifying an Alien Dictionary Easy Array, String, Hash_Table 0 100.00

Day 10 Linked List and Tree
1290 Convert Binary Number in a Linked List to Integer Easy Math, Linked_List 0 100.00
0876 Middle of the Linked List Easy Two_Pointers, Linked_List 0 100.00
0104 Maximum Depth of Binary Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) 0 100.00
0404 Sum of Left Leaves Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 29.26

Day 11 Containers and Libraries
1356 Sort Integers by The Number of 1 Bits Easy Array, Sorting, Bit_Manipulation, Counting 10 65.50
0232 Implement Queue using Stacks Easy Stack, Design, Queue 1 67.21
0242 Valid Anagram Easy String, Hash_Table, Sorting 2 99.01
0217 Contains Duplicate Easy Top_Interview_Questions, Array, Hash_Table, Sorting 6 96.68

Day 12 Class and Object
1603 Design Parking System Easy Design, Simulation, Counting 8 76.16
0303 Range Sum Query - Immutable Easy Array, Design, Prefix_Sum 7 100.00

Programming Skills II

Day 1
0896 Monotonic Array Easy Array 2 86.21
0028 Implement strStr() Easy Top_Interview_Questions, String, Two_Pointers, String_Matching 0 100.00

Day 2
0110 Balanced Binary Tree Easy Depth_First_Search, Tree, Binary_Tree 1 98.82
0459 Repeated Substring Pattern Easy String, String_Matching 8 96.64

Day 3
0150 Evaluate Reverse Polish Notation Medium Top_Interview_Questions, Array, Math, Stack 9 51.23
0066 Plus One Easy Top_Interview_Questions, Array, Math 0 100.00

Day 4
1367 Linked List in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List 2 61.23
0043 Multiply Strings Medium String, Math, Simulation 1 100.00

Day 5
0067 Add Binary Easy String, Math, Bit_Manipulation, Simulation 1 100.00
0989 Add to Array-Form of Integer Easy Array, Math 7 65.92

Day 6
0739 Daily Temperatures Medium Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(n) 8 96.83
0058 Length of Last Word Easy String 0 100.00

Day 7
0048 Rotate Image Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) 0 100.00
1886 Determine Whether Matrix Can Be Obtained By Rotation Easy Array, Matrix 1 78.38

Day 8
0054 Spiral Matrix Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation 0 100.00
0973 K Closest Points to Origin Medium Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect 4 98.26

Day 9
1630 Arithmetic Subarrays Medium Array, Sorting 8 93.62
0429 N-ary Tree Level Order Traversal Medium Breadth_First_Search, Tree 3 80.26

Day 10
0503 Next Greater Element II Medium Array, Stack, Monotonic_Stack 7 97.03
0556 Next Greater Element III Medium String, Math, Two_Pointers 0 100.00

Day 11
1376 Time Needed to Inform All Employees Medium Depth_First_Search, Breadth_First_Search, Tree 8 99.85
0049 Group Anagrams Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n) 6 97.61

Day 12
0438 Find All Anagrams in a String Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) 3 99.83
0713 Subarray Product Less Than K Medium Array, Sliding_Window 8 39.00

Day 13
0304 Range Sum Query 2D - Immutable Medium Array, Matrix, Design, Prefix_Sum 153 87.51
0910 Smallest Range II Medium Array, Math, Sorting, Greedy 10 73.16

Day 14
0143 Reorder List Medium Two_Pointers, Stack, Linked_List, Recursion 2 72.59
0138 Copy List with Random Pointer Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Big_O_Time_O(N)_Space_O(N) 0 100.00

Day 15
0002 Add Two Numbers Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Big_O_Time_O(max(N,M))_Space_O(max(N,M)), AI_can_be_used_to_solve_the_task 1 100.00
0445 Add Two Numbers II Medium Math, Stack, Linked_List 3 90.38

Day 16
0061 Rotate List Medium Two_Pointers, Linked_List 0 100.00
0173 Binary Search Tree Iterator Medium Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator 18 84.18

Day 17
1845 Seat Reservation Manager Medium Design, Heap_Priority_Queue 47 87.63
0860 Lemonade Change Easy Array, Greedy 2 90.84

Day 18
0155 Min Stack Medium Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 4 96.54
0341 Flatten Nested List Iterator Medium Depth_First_Search, Tree, Stack, Design, Queue, Iterator 2 99.95

Day 19
1797 Design Authentication Manager Medium Hash_Table, Design 41 92.67
0707 Design Linked List Medium Design, Linked_List 10 70.60

Day 20
0380 Insert Delete GetRandom O(1) Medium Array, Hash_Table, Math, Design, Randomized 27 93.44
0622 Design Circular Queue Medium Array, Design, Linked_List, Queue 3 100.00
0729 My Calendar I Medium Binary_Search, Design, Ordered_Set, Segment_Tree 17 97.23

Graph Theory I
0733 Flood Fill Easy Array, Depth_First_Search, Breadth_First_Search, Matrix 1 85.36
0200 Number of Islands Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 3 87.24
0695 Max Area of Island Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 3 76.79
1254 Number of Closed Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 3 55.59
1020 Number of Enclaves Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 6 68.24
1905 Count Sub Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 24 85.54
1162 As Far from Land as Possible Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix 16 62.40
0417 Pacific Atlantic Water Flow Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 5 92.62
1091 Shortest Path in Binary Matrix Medium Array, Breadth_First_Search, Matrix 22 69.99
0542 01 Matrix Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix 7 95.83
0934 Shortest Bridge Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 6 97.87
1926 Nearest Exit from Entrance in Maze Medium Array, Breadth_First_Search, Matrix 12 40.55

Day 7 Standard Traversal
0797 All Paths From Source to Target Medium Depth_First_Search, Breadth_First_Search, Graph, Backtracking 2 90.53
0841 Keys and Rooms Medium Depth_First_Search, Breadth_First_Search, Graph 3 51.54

Day 8 Standard Traversal
0547 Number of Provinces Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 2 69.51
1319 Number of Operations to Make Network Connected Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 9 67.64

Day 9 Standard Traversal
1376 Time Needed to Inform All Employees Medium Depth_First_Search, Breadth_First_Search, Tree 8 99.85
0802 Find Eventual Safe States Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 7 74.93

Day 10 Standard Traversal
1129 Shortest Path with Alternating Colors Medium Breadth_First_Search, Graph 4 96.63
1466 Reorder Routes to Make All Paths Lead to the City Zero Medium Depth_First_Search, Breadth_First_Search, Graph 39 97.71
0847 Shortest Path Visiting All Nodes Hard Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask 14 78.72
1306 Jump Game III Medium Array, Depth_First_Search, Breadth_First_Search 2 96.23
1654 Minimum Jumps to Reach Home Medium Array, Dynamic_Programming, Breadth_First_Search 6 99.87
0365 Water and Jug Problem Medium Math, Depth_First_Search, Breadth_First_Search 0 100.00
0433 Minimum Genetic Mutation Medium String, Hash_Table, Breadth_First_Search 1 90.95
0752 Open the Lock Medium Array, String, Hash_Table, Breadth_First_Search 72 91.06
0127 Word Ladder Hard Top_Interview_Questions, String, Hash_Table, Breadth_First_Search 37 94.58

Day 13 Graph Theory
0997 Find the Town Judge Easy Array, Hash_Table, Graph 3 80.64
1557 Minimum Number of Vertices to Reach All Nodes Medium Graph 8 99.94

Day 14 Graph Theory
1615 Maximal Network Rank Medium Graph 3 97.34
0886 Possible Bipartition Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 20 80.12
0785 Is Graph Bipartite? Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 0 100.00

SQL I

Day 1 Select
0595 Big Countries Easy Database 262 84.64
1757 Recyclable and Low Fat Products Easy Database 475 71.54
0584 Find Customer Referee Easy Database 531 58.63
0183 Customers Who Never Order Easy Database 376 98.73

Day 2 Select and Order
1873 Calculate Special Bonus Easy Database 543 71.60
0627 Swap Salary Easy Database 191 96.89
0196 Delete Duplicate Emails Easy Database 903 48.10

Day 3 String Processing Functions
1667 Fix Names in a Table Easy Database 559 80.29
1484 Group Sold Products By The Date Easy LeetCode_Curated_SQL_70, Database 395 77.20
1527 Patients With a Condition Easy Database 308 66.93

Day 4 Union and Select
1965 Employees With Missing Information Easy Database 617 30.40
1795 Rearrange Products Table Easy Database 497 64.83
0608 Tree Node Medium LeetCode_Curated_SQL_70, Database 347 95.17
0176 Second Highest Salary Medium Database 225 73.10

Day 5 Union
0175 Combine Two Tables Easy Database 491 32.30
1581 Customer Who Visited but Did Not Make Any Transactions Easy Database 1039 76.99
1148 Article Views I Easy LeetCode_Curated_SQL_70, Database 783 64.09

Day 6 Union
0197 Rising Temperature Easy Database 342 93.76
0607 Sales Person Easy LeetCode_Curated_SQL_70, Database 1046 86.04

Day 7 Function
1141 User Activity for the Past 30 Days I Easy LeetCode_Curated_SQL_70, Database 849 72.54
1693 Daily Leads and Partners Easy Database 463 78.98
1729 Find Followers Count Easy Database 456 88.39

Day 8 Function
0586 Customer Placing the Largest Number of Orders Easy LeetCode_Curated_SQL_70, Database 484 66.42
0511 Game Play Analysis I Easy LeetCode_Curated_SQL_70, Database 586 56.94
1890 The Latest Login in 2020 Easy Database 571 73.59
1741 Find Total Time Spent by Each Employee Easy Database 414 93.27

Day 9 Control of Flow
1393 Capital Gain/Loss Medium LeetCode_Curated_SQL_70, Database 428 92.01
1407 Top Travellers Easy LeetCode_Curated_SQL_70, Database 682 70.16
1158 Market Analysis I Medium Database 2511 78.92

Day 10 Where
0182 Duplicate Emails Easy Database 303 92.08
1050 Actors and Directors Who Cooperated At Least Three Times Easy LeetCode_Curated_SQL_70, Database 344 76.48
1587 Bank Account Summary II Easy Database 630 60.32
1084 Sales Analysis III Easy LeetCode_Curated_SQL_70, Database 1066 69.71

Level 1

Day 1 Prefix Sum
1480 Running Sum of 1d Array Easy Array, Prefix_Sum 0 100.00
0724 Find Pivot Index Easy Array, Prefix_Sum 2 69.67

Day 2 String
0205 Isomorphic Strings Easy String, Hash_Table 2 99.97
0392 Is Subsequence Easy String, Dynamic_Programming, Two_Pointers 1 93.01

Day 3 Linked List
0021 Merge Two Sorted Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 0 100.00
0206 Reverse Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 0 100.00

Day 4 Linked List
0876 Middle of the Linked List Easy Two_Pointers, Linked_List 0 100.00
0142 Linked List Cycle II Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00

Day 5 Greedy
0121 Best Time to Buy and Sell Stock Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 99.78
0409 Longest Palindrome Easy String, Hash_Table, Greedy 2 92.90

Day 6 Tree
0589 N-ary Tree Preorder Traversal Easy Depth_First_Search, Tree, Stack 1 90.98
0102 Binary Tree Level Order Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 1 91.19
0704 Binary Search Easy Top_100_Liked_Questions, Array, Binary_Search 0 100.00
0278 First Bad Version Easy Binary_Search, Interactive 15 87.89

Day 8 Binary Search Tree
0098 Validate Binary Search Tree Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00
0235 Lowest Common Ancestor of a Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 4 100.00

Day 9 Graph/BFS/DFS
0733 Flood Fill Easy Array, Depth_First_Search, Breadth_First_Search, Matrix 1 85.36
0200 Number of Islands Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 3 87.24

Day 10 Dynamic Programming
0509 Fibonacci Number Easy Dynamic_Programming, Math, Recursion, Memoization 0 100.00
0070 Climbing Stairs Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 0 100.00

Day 11 Dynamic Programming
0746 Min Cost Climbing Stairs Easy Array, Dynamic_Programming 1 86.38
0062 Unique Paths Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Big_O_Time_O(m*n)_Space_O(m*n) 0 100.00

Day 12 Sliding Window/Two Pointer
0438 Find All Anagrams in a String Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n+m)_Space_O(1) 3 99.83
0424 Longest Repeating Character Replacement Medium String, Hash_Table, Sliding_Window 5 95.15

Day 13 Hashmap
0001 Two Sum Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task 2 98.90
0299 Bulls and Cows Medium String, Hash_Table, Counting 6 86.69

Day 14 Stack
0844 Backspace String Compare Easy String, Two_Pointers, Stack, Simulation 0 100.00
0394 Decode String Medium Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) 0 100.00

Day 15 Heap
1046 Last Stone Weight Easy Array, Heap_Priority_Queue 2 73.81
0692 Top K Frequent Words Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort 11 38.54

Level 2

Day 1 Implementation/Simulation
0202 Happy Number Easy Top_Interview_Questions, Hash_Table, Math, Two_Pointers 1 98.59
0054 Spiral Matrix Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation 0 100.00
1706 Where Will the Ball Fall Medium Array, Dynamic_Programming, Depth_First_Search, Matrix, Simulation 2 64.55

Day 2 String
0014 Longest Common Prefix Easy Top_100_Liked_Questions, Top_Interview_Questions, String 0 100.00
0043 Multiply Strings Medium String, Math, Simulation 1 100.00

Day 3 Linked List
0019 Remove Nth Node From End of List Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Big_O_Time_O(L)_Space_O(L) 0 100.00
0234 Palindrome Linked List Easy Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 4 84.46

Day 4 Linked List
0328 Odd Even Linked List Medium Linked_List 0 100.00
0148 Sort List Medium Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(log(N))_Space_O(log(N)) 9 93.90

Day 5 Greedy
2131 Longest Palindrome by Concatenating Two Letter Words Medium Array, String, Hash_Table, Greedy, Counting 73 76.60
0621 Task Scheduler Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 3 84.32

Day 6 Tree
0226 Invert Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0110 Balanced Binary Tree Easy Depth_First_Search, Tree, Binary_Tree 1 98.82

Day 7 Tree
0543 Diameter of Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0437 Path Sum III Medium Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 2 100.00
0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 0 100.00
0033 Search in Rotated Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00

Day 9 Binary Search Tree
0108 Convert Sorted Array to Binary Search Tree Easy Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer 0 100.00
0230 Kth Smallest Element in a BST Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0173 Binary Search Tree Iterator Medium Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator 18 84.18

Day 10 Graph/BFS/DFS
0994 Rotting Oranges Medium Top_100_Liked_Questions, Array, Breadth_First_Search, Matrix 3 74.27
0417 Pacific Atlantic Water Flow Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 5 92.62

Day 11 Graph/BFS/DFS
0210 Course Schedule II Medium Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 13 35.17
0815 Bus Routes Hard Array, Hash_Table, Breadth_First_Search 49 89.11

Day 12 Dynamic Programming
0198 House Robber Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 0 100.00
0322 Coin Change Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount) 12 92.59

Day 13 Dynamic Programming
0416 Partition Equal Subset Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums) 5 99.88
0152 Maximum Product Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 92.74

Day 14 Sliding Window/Two Pointer
0003 Longest Substring Without Repeating Characters Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task 2 98.59
0016 3Sum Closest Medium Array, Sorting, Two_Pointers 4 98.21
0076 Minimum Window Substring Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(s.length())_Space_O(1) 2 99.83

Day 15 Tree
0100 Same Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00
0101 Symmetric Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00
0199 Binary Tree Right Side View Medium Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 94.57

Day 16 Design
0232 Implement Queue using Stacks Easy Stack, Design, Queue 1 67.21
0155 Min Stack Medium Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 4 96.54
0208 Implement Trie (Prefix Tree) Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) 32 95.05

Day 17 Interval
0057 Insert Interval Medium Array 0 100.00
0056 Merge Intervals Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) 7 98.37

Day 18 Stack
0735 Asteroid Collision Medium Array, Stack 2 99.59
0227 Basic Calculator II Medium String, Math, Stack 8 95.32

Day 19 Union Find
0547 Number of Provinces Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 2 69.51
0947 Most Stones Removed with Same Row or Column Medium Depth_First_Search, Graph, Union_Find 7 98.83

Day 20 Brute Force/Backtracking
0039 Combination Sum Medium Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) 1 99.99
0046 Permutations Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!) 1 94.08

Udemy

Udemy Integers
0412 Fizz Buzz Easy String, Math, Simulation 1 100.00
0136 Single Number Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Big_O_Time_O(N)_Space_O(1) 1 99.86
0007 Reverse Integer Medium Top_Interview_Questions, Math 0 100.00
0009 Palindrome Number Easy Math 4 100.00
0172 Factorial Trailing Zeroes Medium Top_Interview_Questions, Math 1 85.61
0050 Pow(x, n) Medium Top_Interview_Questions, Math, Recursion 0 100.00

Udemy Strings
0344 Reverse String Easy String, Two_Pointers, Recursion 1 99.91
0014 Longest Common Prefix Easy Top_100_Liked_Questions, Top_Interview_Questions, String 0 100.00
0187 Repeated DNA Sequences Medium String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash 29 77.11
0003 Longest Substring Without Repeating Characters Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task 2 98.59
0020 Valid Parentheses Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) 2 97.19
0005 Longest Palindromic Substring Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 7 97.82
0394 Decode String Medium Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n) 0 100.00
0242 Valid Anagram Easy String, Hash_Table, Sorting 2 99.01
0049 Group Anagrams Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Big_O_Time_O(n*k_log_k)_Space_O(n) 6 97.61
0151 Reverse Words in a String Medium String, Two_Pointers 2 99.94
0273 Integer to English Words Hard String, Math, Recursion 3 95.67
0704 Binary Search Easy Top_100_Liked_Questions, Array, Binary_Search 0 100.00
0033 Search in Rotated Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0153 Find Minimum in Rotated Sorted Array Medium Top_100_Liked_Questions, Array, Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 0 100.00

Udemy Arrays
0121 Best Time to Buy and Sell Stock Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 99.78
0283 Move Zeroes Easy Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 2 83.99
0001 Two Sum Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task 2 98.90
0217 Contains Duplicate Easy Top_Interview_Questions, Array, Hash_Table, Sorting 6 96.68
0058 Length of Last Word Easy String 0 100.00
0605 Can Place Flowers Easy Array, Greedy 1 96.77
0122 Best Time to Buy and Sell Stock II Medium Top_Interview_Questions, Array, Dynamic_Programming, Greedy 1 96.82
0080 Remove Duplicates from Sorted Array II Medium Array, Two_Pointers 0 100.00
0189 Rotate Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 0 100.00
0055 Jump Game Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1) 1 100.00
0075 Sort Colors Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 0 100.00
0066 Plus One Easy Top_Interview_Questions, Array, Math 0 100.00
0238 Product of Array Except Self Medium Top_100_Liked_Questions, Array, Prefix_Sum, Big_O_Time_O(n^2)_Space_O(n) 1 99.66
1291 Sequential Digits Medium Enumeration 0 100.00
0448 Find All Numbers Disappeared in an Array Easy Array, Hash_Table 3 100.00
0442 Find All Duplicates in an Array Medium Array, Hash_Table 5 98.83
0041 First Missing Positive Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n) 1 100.00
0697 Degree of an Array Easy Array, Hash_Table 14 93.19
0532 K-diff Pairs in an Array Medium Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 13 58.23
0713 Subarray Product Less Than K Medium Array, Sliding_Window 8 39.00
1007 Minimum Domino Rotations For Equal Row Medium Array, Greedy 5 79.64
1306 Jump Game III Medium Array, Depth_First_Search, Breadth_First_Search 2 96.23
0456 132 Pattern Medium Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack 16 82.41
0239 Sliding Window Maximum Hard Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Big_O_Time_O(n*k)_Space_O(n+k) 26 95.89

Udemy Two Pointers
0392 Is Subsequence Easy String, Dynamic_Programming, Two_Pointers 1 93.01
0125 Valid Palindrome Easy Top_Interview_Questions, String, Two_Pointers 3 98.64
0977 Squares of a Sorted Array Easy Array, Sorting, Two_Pointers 1 100.00
0026 Remove Duplicates from Sorted Array Easy Top_Interview_Questions, Array, Two_Pointers 1 98.56
0042 Trapping Rain Water Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Big_O_Time_O(n)_Space_O(1) 0 100.00
0015 3Sum Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 29 72.02

Udemy Famous Algorithm
0053 Maximum Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 1 99.32
0169 Majority Element Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 1 99.89

Udemy Sorting Algorithms
0912 Sort an Array Medium Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort 25 38.15

Udemy 2D Arrays/Matrix
0304 Range Sum Query 2D - Immutable Medium Array, Matrix, Design, Prefix_Sum 153 87.51
0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 0 100.00
0054 Spiral Matrix Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation 0 100.00
0048 Rotate Image Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Big_O_Time_O(n^2)_Space_O(1) 0 100.00
1572 Matrix Diagonal Sum Easy Array, Matrix 0 100.00
0073 Set Matrix Zeroes Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Big_O_Time_O(m*n)_Space_O(1) 0 100.00
0056 Merge Intervals Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n) 7 98.37

Udemy Linked List
0114 Flatten Binary Tree to Linked List Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Big_O_Time_O(N)_Space_O(N) 0 100.00
0445 Add Two Numbers II Medium Math, Stack, Linked_List 3 90.38
0328 Odd Even Linked List Medium Linked_List 0 100.00
0061 Rotate List Medium Two_Pointers, Linked_List 0 100.00
0024 Swap Nodes in Pairs Medium Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 0 100.00
0876 Middle of the Linked List Easy Two_Pointers, Linked_List 0 100.00
0142 Linked List Cycle II Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00
0141 Linked List Cycle Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00
0206 Reverse Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 0 100.00
0021 Merge Two Sorted Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 0 100.00
0160 Intersection of Two Linked Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(M+N)_Space_O(1) 1 99.92
0234 Palindrome Linked List Easy Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1) 4 84.46
0138 Copy List with Random Pointer Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Big_O_Time_O(N)_Space_O(N) 0 100.00
0025 Reverse Nodes in k-Group Hard Top_100_Liked_Questions, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(k) 0 100.00
0146 LRU Cache Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Big_O_Time_O(1)_Space_O(capacity) 40 98.20
0707 Design Linked List Medium Design, Linked_List 10 70.60

Udemy Tree Stack Queue
0144 Binary Tree Preorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack 1 48.38
0094 Binary Tree Inorder Traversal Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) 0 100.00
0145 Binary Tree Postorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack 1 49.11
0102 Binary Tree Level Order Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 1 91.19
0103 Binary Tree Zigzag Level Order Traversal Medium Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree 1 95.00
0108 Convert Sorted Array to Binary Search Tree Easy Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer 0 100.00
1008 Construct Binary Search Tree from Preorder Traversal Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree 0 100.00
0543 Diameter of Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0938 Range Sum of BST Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00
0100 Same Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00
0226 Invert Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0111 Minimum Depth of Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 97.49
0104 Maximum Depth of Binary Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) 0 100.00
0110 Balanced Binary Tree Easy Depth_First_Search, Tree, Binary_Tree 1 98.82
0701 Insert into a Binary Search Tree Medium Tree, Binary_Tree, Binary_Search_Tree 0 100.00
0297 Serialize and Deserialize Binary Tree Hard String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design 7 98.13
0124 Binary Tree Maximum Path Sum Hard Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 0 100.00
0098 Validate Binary Search Tree Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00
0337 House Robber III Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 1 91.77
0236 Lowest Common Ancestor of a Binary Tree Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 6 100.00
0968 Binary Tree Cameras Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 0 100.00

Udemy Trie and Heap
0208 Implement Trie (Prefix Tree) Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) 32 95.05
0745 Prefix and Suffix Search Hard String, Design, Trie 366 76.15

Udemy Graph
0200 Number of Islands Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Big_O_Time_O(M*N)_Space_O(M*N) 3 87.24
0133 Clone Graph Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Graph 45 29.80
0417 Pacific Atlantic Water Flow Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 5 92.62

Udemy Dynamic Programming
0120 Triangle Medium Array, Dynamic_Programming 2 94.63
0118 Pascal’s Triangle Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming 1 67.08
0119 Pascal’s Triangle II Easy Array, Dynamic_Programming 0 100.00
0139 Word Break Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 1 99.42
0152 Maximum Product Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 92.74
0198 House Robber Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 0 100.00
0213 House Robber II Medium Array, Dynamic_Programming 0 100.00
0509 Fibonacci Number Easy Dynamic_Programming, Math, Recursion, Memoization 0 100.00
0070 Climbing Stairs Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Big_O_Time_O(n)_Space_O(n) 0 100.00
0064 Minimum Path Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n) 1 99.73
0300 Longest Increasing Subsequence Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Big_O_Time_O(n*log_n)_Space_O(n) 3 95.75
1143 Longest Common Subsequence Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 19 89.05
0072 Edit Distance Medium Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 3 97.19
0044 Wildcard Matching Hard Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion 2 99.87
0010 Regular Expression Matching Hard Top_Interview_Questions, String, Dynamic_Programming, Recursion, Big_O_Time_O(m*n)_Space_O(m*n) 1 100.00

Udemy Backtracking/Recursion
0022 Generate Parentheses Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(2^n)_Space_O(n) 0 100.00
0039 Combination Sum Medium Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(2^n)_Space_O(n+2^n) 1 99.99
0216 Combination Sum III Medium Array, Backtracking 1 81.35
0078 Subsets Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Big_O_Time_O(2^n)_Space_O(n*2^n) 0 100.00
0017 Letter Combinations of a Phone Number Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Big_O_Time_O(4^n)_Space_O(n) 0 100.00
0046 Permutations Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Big_O_Time_O(n*n!)_Space_O(n+n!) 1 94.08

Udemy Bit Manipulation
0191 Number of 1 Bits Easy Top_Interview_Questions, Bit_Manipulation 1 84.87
0389 Find the Difference Easy String, Hash_Table, Sorting, Bit_Manipulation 1 100.00
0190 Reverse Bits Easy Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer 1 98.66
0461 Hamming Distance Easy Bit_Manipulation 0 100.00
1009 Complement of Base 10 Integer Easy Bit_Manipulation 1 41.56
0338 Counting Bits Easy Dynamic_Programming, Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) 2 96.37
0371 Sum of Two Integers Medium Math, Bit_Manipulation 0 100.00
0029 Divide Two Integers Medium Top_Interview_Questions, Math, Bit_Manipulation 1 97.44

Udemy Design
0155 Min Stack Medium Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Big_O_Time_O(1)_Space_O(N) 4 96.54

Data Structure I

Day 1 Array
0217 Contains Duplicate Easy Top_Interview_Questions, Array, Hash_Table, Sorting 6 96.68
0053 Maximum Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Big_O_Time_O(n)_Space_O(1) 1 99.32

Day 2 Array
0001 Two Sum Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task 2 98.90
0088 Merge Sorted Array Easy Top_Interview_Questions, Array, Sorting, Two_Pointers 0 100.00

Day 3 Array
0350 Intersection of Two Arrays II Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 4 69.62
0121 Best Time to Buy and Sell Stock Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 99.78

Day 4 Array
0566 Reshape the Matrix Easy Array, Matrix, Simulation 1 90.08
0118 Pascal’s Triangle Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming 1 67.08

Day 5 Array
0036 Valid Sudoku Medium Top_Interview_Questions, Array, Hash_Table, Matrix 1 100.00
0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 0 100.00

Day 6 String
0387 First Unique Character in a String Easy String, Hash_Table, Counting, Queue 1 100.00
0383 Ransom Note Easy String, Hash_Table, Counting 1 99.97
0242 Valid Anagram Easy String, Hash_Table, Sorting 2 99.01

Day 7 Linked List
0141 Linked List Cycle Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00
0021 Merge Two Sorted Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(m+n)_Space_O(m+n) 0 100.00
0203 Remove Linked List Elements Easy Linked_List, Recursion 1 98.82

Day 8 Linked List
0206 Reverse Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Big_O_Time_O(N)_Space_O(1) 0 100.00
0083 Remove Duplicates from Sorted List Easy Linked_List 0 100.00

Day 9 Stack Queue
0020 Valid Parentheses Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n) 2 97.19
0232 Implement Queue using Stacks Easy Stack, Design, Queue 1 67.21

Day 10 Tree
0144 Binary Tree Preorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack 1 48.38
0094 Binary Tree Inorder Traversal Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Big_O_Time_O(n)_Space_O(n) 0 100.00
0145 Binary Tree Postorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack 1 49.11

Day 11 Tree
0102 Binary Tree Level Order Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(N) 1 91.19
0104 Maximum Depth of Binary Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(H) 0 100.00
0101 Symmetric Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00

Day 12 Tree
0226 Invert Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0112 Path Sum Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00

Day 13 Tree
0700 Search in a Binary Search Tree Easy Tree, Binary_Tree, Binary_Search_Tree 0 100.00
0701 Insert into a Binary Search Tree Medium Tree, Binary_Tree, Binary_Search_Tree 0 100.00

Day 14 Tree
0098 Validate Binary Search Tree Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00
0653 Two Sum IV - Input is a BST Easy Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree 5 74.23
0235 Lowest Common Ancestor of a Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 4 100.00

Algorithms

# Title Difficulty Tag Time, ms Time, %
3352 Count K-Reducible Numbers Less Than N Hard String, Dynamic_Programming, Math, Combinatorics 11 99.58
3351 Sum of Good Subsequences Hard Array, Hash_Table, Dynamic_Programming 13 99.09
3350 Adjacent Increasing Subarrays Detection II Medium Array, Binary_Search 10 99.76
3349 Adjacent Increasing Subarrays Detection I Easy Array 1 100.00
3348 Smallest Divisible Digit Product II Hard String, Math, Greedy, Backtracking, Number_Theory 21 100.00
3347 Maximum Frequency of an Element After Performing Operations II Hard Array, Sorting, Binary_Search, Prefix_Sum, Sliding_Window 30 98.88
3346 Maximum Frequency of an Element After Performing Operations I Medium Array, Sorting, Binary_Search, Prefix_Sum, Sliding_Window 7 96.84
3345 Smallest Divisible Digit Product I Easy Math, Enumeration 0 100.00
3343 Count Number of Balanced Permutations Hard String, Dynamic_Programming, Math, Combinatorics 64 85.37
3342 Find Minimum Time to Reach Last Room II Medium Array, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 495 37.48
3341 Find Minimum Time to Reach Last Room I Medium Array, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 8 67.58
3340 Check Balanced String Easy String 1 99.60
3337 Total Characters in String After Transformations II Hard String, Hash_Table, Dynamic_Programming, Math, Counting 67 99.31
3336 Find the Number of Subsequences With Equal GCD Hard Array, Dynamic_Programming, Math, Number_Theory 408 50.28
3335 Total Characters in String After Transformations I Medium String, Hash_Table, Dynamic_Programming, Math, Counting 77 77.83
3334 Find the Maximum Factor Score of Array Medium Array, Math, Number_Theory 5 95.93
3333 Find the Original Typed String II Hard String, Dynamic_Programming, Prefix_Sum 89 90.20
3332 Maximum Points Tourist Can Earn Medium Array, Dynamic_Programming, Matrix 53 100.00
3331 Find Subtree Sizes After Changes Medium Array, String, Hash_Table, Depth_First_Search, Tree 166 52.73
3330 Find the Original Typed String I Easy String 1 96.13
3327 Check if DFS Strings Are Palindromes Hard Array, String, Hash_Table, Depth_First_Search, Tree, Hash_Function 159 90.40
3326 Minimum Division Operations to Make Array Non Decreasing Medium Array, Math, Greedy, Number_Theory 20 97.34
3325 Count Substrings With K-Frequency Characters I Medium String, Hash_Table, Sliding_Window 1 100.00
3324 Find the Sequence of Strings Appeared on the Screen Medium String, Simulation 6 92.04
3321 Find X-Sum of All K-Long Subarrays II Hard Array, Hash_Table, Heap_Priority_Queue, Sliding_Window 410 94.03
3320 Count The Number of Winning Sequences Hard String, Dynamic_Programming 43 99.76
3319 K-th Largest Perfect Subtree Size in Binary Tree Medium Sorting, Depth_First_Search, Tree, Binary_Tree 10 87.48
3318 Find X-Sum of All K-Long Subarrays I Easy Array, Hash_Table, Heap_Priority_Queue, Sliding_Window 11 77.35
3317 Find the Number of Possible Ways for an Event Hard Dynamic_Programming, Math, Combinatorics 20 97.08
3316 Find Maximum Removals From Source String Medium Array, String, Hash_Table, Dynamic_Programming, Two_Pointers 10 100.00
3315 Construct the Minimum Bitwise Array II Medium Array, Bit_Manipulation 1 100.00
3314 Construct the Minimum Bitwise Array I Easy Array, Bit_Manipulation 3 92.32
3312 Sorted GCD Pair Queries Hard Array, Hash_Table, Math, Binary_Search, Prefix_Sum, Counting, Number_Theory, Combinatorics 29 94.69
3311 Construct 2D Grid Matching Graph Layout Hard Array, Hash_Table, Matrix, Graph 43 94.34
3310 Remove Methods From Project Medium Depth_First_Search, Breadth_First_Search, Graph 41 99.76
3309 Maximum Possible Number by Binary Concatenation Medium Array, Bit_Manipulation, Enumeration 3 97.01
3307 Find the K-th Character in String Game II Hard Math, Bit_Manipulation, Recursion 1 99.65
3306 Count of Substrings Containing Every Vowel and K Consonants II Medium String, Hash_Table, Sliding_Window 340 44.09
3305 Count of Substrings Containing Every Vowel and K Consonants I Medium String, Hash_Table, Sliding_Window 2 99.72
3304 Find the K-th Character in String Game I Easy Math, Bit_Manipulation, Simulation, Recursion 0 100.00
3303 Find the Occurrence of First Almost Equal Substring Hard String, String_Matching 39 100.00
3302 Find the Lexicographically Smallest Valid Sequence Medium String, Dynamic_Programming, Greedy, Two_Pointers 21 97.32
3301 Maximize the Total Height of Unique Towers Medium Array, Sorting, Greedy 49 92.39
3300 Minimum Element After Replacement With Digit Sum Easy Array, Math 1 100.00
3298 Count Substrings That Can Be Rearranged to Contain a String II Hard String, Hash_Table, Sliding_Window 31 100.00
3297 Count Substrings That Can Be Rearranged to Contain a String I Medium String, Hash_Table, Sliding_Window 5 99.40
3296 Minimum Number of Seconds to Make Mountain Height Zero Medium Array, Math, Binary_Search 6 100.00
3295 Report Spam Message Medium Array, String, Hash_Table 39 98.87
3292 Minimum Number of Valid Strings to Form Target II Hard Array, String, Dynamic_Programming, Binary_Search, Segment_Tree, Hash_Function, String_Matching, Rolling_Hash 103 100.00
3291 Minimum Number of Valid Strings to Form Target I Medium Array, String, Dynamic_Programming, Binary_Search, Trie, Segment_Tree, Hash_Function, String_Matching, Rolling_Hash 263 60.00
3290 Maximum Multiplication Score Medium Array, Dynamic_Programming 8 100.00
3289 The Two Sneaky Numbers of Digitville Easy Array, Hash_Table, Math 3 100.00
3288 Length of the Longest Increasing Path Hard Array, Sorting, Binary_Search 34 100.00
3287 Find the Maximum Sequence Value of Array Hard Array, Dynamic_Programming, Bit_Manipulation 1140 100.00
3286 Find a Safe Walk Through a Grid Medium Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 90 100.00
3285 Find Indices of Stable Mountains Easy Array 1 100.00
3283 Maximum Number of Moves to Kill All Pawns Hard Array, Math, Breadth_First_Search, Bit_Manipulation, Bitmask, Game_Theory 250 98.43
3282 Reach End of Array With Max Score Medium Array, Greedy 9 100.00
3281 Maximize Score of Numbers in Ranges Medium Array, Sorting, Greedy, Binary_Search 47 100.00
3280 Convert Date to Binary Easy String, Math 3 100.00
3277 Maximum XOR Score Subarray Queries Hard Array, Dynamic_Programming 29 98.87
3276 Select Cells in Grid With Maximum Score Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 6 99.82
3275 K-th Nearest Obstacle Queries Medium Array, Heap_Priority_Queue 33 100.00
3274 Check if Two Chessboard Squares Have the Same Color Easy String, Math 0 100.00
3273 Minimum Amount of Damage Dealt to Bob Hard Array, Sorting, Greedy 76 100.00
3272 Find the Count of Good Integers Hard Hash_Table, Math, Enumeration, Combinatorics 167 100.00
3271 Hash Divided String Medium String, Simulation 2 100.00
3270 Find the Key of the Numbers Easy Math 0 100.00
3267 Count Almost Equal Pairs II Hard Array, Hash_Table, Sorting, Counting, Enumeration 353 99.78
3266 Final Array State After K Multiplication Operations II Hard Array, Heap_Priority_Queue, Simulation 26 100.00
3265 Count Almost Equal Pairs I Medium Array, Hash_Table, Sorting, Counting, Enumeration 5 100.00
3264 Final Array State After K Multiplication Operations I Easy Array, Math, Heap_Priority_Queue, Simulation 1 100.00
3261 Count Substrings That Satisfy K-Constraint II Hard Array, String, Binary_Search, Prefix_Sum, Sliding_Window 8 100.00
3260 Find the Largest Palindrome Divisible by K Hard String, Dynamic_Programming, Math, Greedy, Number_Theory 4 97.21
3259 Maximum Energy Boost From Two Drinks Medium Array, Dynamic_Programming 3 100.00
3258 Count Substrings That Satisfy K-Constraint I Easy String, Sliding_Window 1 100.00
3257 Maximum Value Sum by Placing Three Rooks II Hard Array, Dynamic_Programming, Matrix, Enumeration 18 99.59
3256 Maximum Value Sum by Placing Three Rooks I Hard Array, Dynamic_Programming, Matrix, Enumeration 7 100.00
3255 Find the Power of K-Size Subarrays II Medium Array, Sliding_Window 3 99.24
3254 Find the Power of K-Size Subarrays I Medium Array, Sliding_Window 1 100.00
3251 Find the Count of Monotonic Pairs II Hard Array, Dynamic_Programming, Math, Prefix_Sum, Combinatorics 24 100.00
3250 Find the Count of Monotonic Pairs I Hard Array, Dynamic_Programming, Math, Prefix_Sum, Combinatorics 3 100.00
3249 Count the Number of Good Nodes Medium Depth_First_Search, Tree 34 100.00
3248 Snake in Matrix Easy Array, String, Simulation 2 98.05
3245 Alternating Groups III Hard Array, Binary_Indexed_Tree 36 82.22
3244 Shortest Distance After Road Addition Queries II Hard Array, Greedy, Graph, Ordered_Set 5 97.43
3243 Shortest Distance After Road Addition Queries I Medium Array, Breadth_First_Search, Graph 6 100.00
3242 Design Neighbor Sum Service Easy Array, Hash_Table, Matrix, Design, Simulation 14 100.00
3241 Time Taken to Mark All Nodes Hard Dynamic_Programming, Depth_First_Search, Tree, Graph 39 100.00
3240 Minimum Number of Flips to Make Binary Grid Palindromic II Medium Array, Matrix, Two_Pointers 3 96.90
3239 Minimum Number of Flips to Make Binary Grid Palindromic I Medium Array, Matrix, Two_Pointers 3 100.00
3238 Find the Number of Winning Players Easy Array, Hash_Table, Counting 1 100.00
3235 Check if the Rectangle Corner Is Reachable Hard Array, Math, Depth_First_Search, Breadth_First_Search, Union_Find, Geometry 95 59.46
3234 Count the Number of Substrings With Dominant Ones Medium String, Sliding_Window, Enumeration 163 93.90
3233 Find the Count of Numbers Which Are Not Special Medium Array, Math, Number_Theory 20 70.12
3232 Find if Digit Game Can Be Won Easy Array, Math 0 100.00
3229 Minimum Operations to Make Array Equal to Target Hard Array, Dynamic_Programming, Greedy, Stack, Monotonic_Stack 2 100.00
3228 Maximum Number of Operations to Move Ones to the End Medium String, Greedy, Counting 5 100.00
3227 Vowels Game in a String Medium String, Math, Game_Theory, Brainteaser 4 96.15
3226 Number of Bit Changes to Make Two Integers Equal Easy Bit_Manipulation 0 100.00
3225 Maximum Score From Grid Operations Hard Array, Dynamic_Programming, Matrix, Prefix_Sum 21 100.00
3224 Minimum Array Changes to Make Differences Equal Medium Array, Hash_Table, Prefix_Sum 4 100.00
3223 Minimum Length of String After Operations Medium String, Hash_Table, Counting 9 94.23
3222 Find the Winning Player in Coin Game Easy Math, Simulation, Game_Theory 0 100.00
3220 Odd and Even Transactions Medium Database 248 85.85
3219 Minimum Cost for Cutting Cake II Hard Array, Sorting, Greedy 3 100.00
3218 Minimum Cost for Cutting Cake I Medium Array, Dynamic_Programming, Sorting, Greedy 0 100.00
3217 Delete Nodes From Linked List Present in Array Medium Array, Hash_Table, Linked_List 3 100.00
3216 Lexicographically Smallest String After a Swap Easy String, Greedy 1 100.00
3213 Construct String with Minimum Cost Hard Array, String, Dynamic_Programming, Suffix_Array 261 88.55
3212 Count Submatrices With Equal Frequency of X and Y Medium Array, Matrix, Prefix_Sum 15 100.00
3211 Generate Binary Strings Without Adjacent Zeros Medium String, Bit_Manipulation, Recursion 1 100.00
3210 Find the Encrypted String Easy String 1 100.00
3209 Number of Subarrays With AND Value of K Hard Array, Binary_Search, Bit_Manipulation, Segment_Tree 7 100.00
3208 Alternating Groups II Medium Array, Sliding_Window 2 99.02
3207 Maximum Points After Enemy Battles Medium Array, Greedy 1 100.00
3206 Alternating Groups I Easy Array, Sliding_Window 1 97.24
3203 Find Minimum Diameter After Merging Two Trees Hard Depth_First_Search, Breadth_First_Search, Tree, Graph 29 99.83
3202 Find the Maximum Length of Valid Subsequence II Medium Array, Dynamic_Programming 34 92.46
3201 Find the Maximum Length of Valid Subsequence I Medium Array, Dynamic_Programming 5 82.23
3200 Maximum Height of a Triangle Easy Array, Enumeration 1 86.34
3197 Find the Minimum Area to Cover All Ones II Hard Array, Matrix, Enumeration 10 99.66
3196 Maximize Total Cost of Alternating Subarrays Medium Array, Dynamic_Programming 1 100.00
3195 Find the Minimum Area to Cover All Ones I Medium Array, Matrix 5 94.40
3194 Minimum Average of Smallest and Largest Elements Easy Array, Sorting, Two_Pointers 2 98.88
3193 Count the Number of Inversions Hard Array, Dynamic_Programming 11 96.54
3192 Minimum Operations to Make Binary Array Elements Equal to One II Medium Array, Dynamic_Programming, Greedy 6 99.64
3191 Minimum Operations to Make Binary Array Elements Equal to One I Medium Array, Bit_Manipulation, Prefix_Sum, Sliding_Window, Queue 6 99.99
3190 Find Minimum Operations to Make All Elements Divisible by Three Easy Array, Math 0 100.00
3187 Peaks in Array Hard Array, Segment_Tree, Binary_Indexed_Tree 18 100.00
3186 Maximum Total Damage With Spell Casting Medium Array, Hash_Table, Dynamic_Programming, Sorting, Binary_Search, Two_Pointers, Counting 51 99.29
3185 Count Pairs That Form a Complete Day II Medium Array, Hash_Table, Counting 3 97.60
3184 Count Pairs That Form a Complete Day I Easy Array, Hash_Table, Counting 1 98.20
3181 Maximum Total Reward Using Operations II Hard Array, Dynamic_Programming, Bit_Manipulation 2 100.00
3180 Maximum Total Reward Using Operations I Medium Array, Dynamic_Programming 1 100.00
3179 Find the N-th Value After K Seconds Medium Array, Math, Simulation, Prefix_Sum, Combinatorics 2 99.86
3178 Find the Child Who Has the Ball After K Seconds Easy Math, Simulation 0 100.00
3177 Find the Maximum Length of a Good Subsequence II Hard Array, Hash_Table, Dynamic_Programming 11 100.00
3176 Find the Maximum Length of a Good Subsequence I Medium Array, Hash_Table, Dynamic_Programming 4 99.70
3175 Find The First Player to win K Games in a Row Medium Array, Simulation 1 100.00
3174 Clear Digits Easy String, Hash_Table, Simulation 1 100.00
3171 Find Subarray With Bitwise AND Closest to K Hard Array, Binary_Search, Bit_Manipulation, Segment_Tree 10 98.04
3170 Lexicographically Minimum String After Removing Stars Medium String, Hash_Table, Greedy, Stack, Heap_Priority_Queue 29 99.93
3169 Count Days Without Meetings Medium Array, Sorting 11 99.96
3168 Minimum Number of Chairs in a Waiting Room Easy String, Simulation 1 100.00
3165 Maximum Sum of Subsequence With Non-adjacent Elements Hard Array, Dynamic_Programming, Divide_and_Conquer, Segment_Tree 64 100.00
3164 Find the Number of Good Pairs II Medium Array, Hash_Table 407 75.28
3163 String Compression III Medium String 17 88.10
3162 Find the Number of Good Pairs I Easy Array, Hash_Table 1 99.96
3161 Block Placement Queries Hard Array, Binary_Search, Segment_Tree, Binary_Indexed_Tree 137 99.38
3160 Find the Number of Distinct Colors Among the Balls Medium Array, Hash_Table, Simulation 36 98.82
3159 Find Occurrences of an Element in an Array Medium Array, Hash_Table 4 96.74
3158 Find the XOR of Numbers Which Appear Twice Easy Array, Hash_Table, Bit_Manipulation 1 99.87
3154 Find Number of Ways to Reach the K-th Stair Hard Dynamic_Programming, Math, Bit_Manipulation, Memoization, Combinatorics 0 100.00
3153 Sum of Digit Differences of All Pairs Medium Array, Hash_Table, Math, Counting 12 100.00
3152 Special Array II Medium Array, Binary_Search, Prefix_Sum 2 99.93
3151 Special Array I Easy Array 0 100.00
3149 Find the Minimum Cost Array Permutation Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 105 88.11
3148 Maximum Difference Score in a Grid Medium Array, Dynamic_Programming, Matrix 5 100.00
3147 Taking Maximum Energy From the Mystic Dungeon Medium Array, Prefix_Sum 2 97.58
3146 Permutation Difference between Two Strings Easy String, Hash_Table 1 100.00
3145 Find Products of Elements of Big Array Hard Array, Binary_Search, Bit_Manipulation 3 98.41
3144 Minimum Substring Partition of Equal Character Frequency Medium String, Hash_Table, Dynamic_Programming, Counting 37 100.00
3143 Maximum Points Inside the Square Medium Array, String, Hash_Table, Sorting, Binary_Search 2 100.00
3142 Check if Grid Satisfies Conditions Easy Array, Matrix 1 95.76
3139 Minimum Cost to Equalize Array Hard Array, Greedy, Enumeration 1 100.00
3138 Minimum Length of Anagram Concatenation Medium String, Hash_Table, Counting 4 84.18
3137 Minimum Number of Operations to Make Word K-Periodic Medium String, Hash_Table, Counting 19 99.53
3136 Valid Word Easy String 1 99.39
3134 Find the Median of the Uniqueness Array Hard Array, Hash_Table, Binary_Search, Sliding_Window 47 100.00
3133 Minimum Array End Medium Bit_Manipulation 1 92.38
3132 Find the Integer Added to Array II Medium Array, Sorting, Two_Pointers, Enumeration 2 100.00
3131 Find the Integer Added to Array I Easy Array 0 100.00
3130 Find All Possible Stable Binary Arrays II Hard Dynamic_Programming, Prefix_Sum 3 100.00
3129 Find All Possible Stable Binary Arrays I Medium Dynamic_Programming, Prefix_Sum 3 100.00
3128 Right Triangles Medium Array, Hash_Table, Math, Counting, Combinatorics 6 100.00
3127 Make a Square with the Same Color Easy Array, Matrix, Enumeration 0 100.00
3123 Find Edges in Shortest Paths Hard Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 24 100.00
3122 Minimum Number of Operations to Satisfy Conditions Medium Array, Dynamic_Programming, Matrix 6 100.00
3121 Count the Number of Special Characters II Medium String, Hash_Table 6 100.00
3120 Count the Number of Special Characters I Easy String, Hash_Table 1 100.00
3117 Minimum Sum of Values by Dividing Array Hard Array, Dynamic_Programming, Binary_Search, Bit_Manipulation, Queue, Segment_Tree 6 100.00
3116 Kth Smallest Amount With Single Denomination Combination Hard Array, Math, Binary_Search, Bit_Manipulation, Number_Theory, Combinatorics 2 100.00
3115 Maximum Prime Difference Medium Array, Math, Number_Theory 1 99.91
3114 Latest Time You Can Obtain After Replacing Characters Easy String, Enumeration 1 100.00
3113 Find the Number of Subarrays Where Boundary Elements Are Maximum Hard Array, Binary_Search, Stack, Monotonic_Stack 13 98.83
3112 Minimum Time to Visit Disappearing Nodes Medium Array, Heap_Priority_Queue, Graph, Shortest_Path 10 100.00
3111 Minimum Rectangles to Cover Points Medium Array, Sorting, Greedy 4 99.55
3110 Score of a String Easy String 1 99.93
3108 Minimum Cost Walk in Weighted Graph Hard Array, Bit_Manipulation, Graph, Union_Find 3 100.00
3107 Minimum Operations to Make Median of Array Equal to K Medium Array, Sorting, Greedy 28 98.49
3106 Lexicographically Smallest String After Operations With Constraint Medium String, Greedy 1 100.00
3105 Longest Strictly Increasing or Strictly Decreasing Subarray Easy Array 1 98.13
3102 Minimize Manhattan Distances Hard Array, Math 3 99.73
3101 Count Alternating Subarrays Medium Array, Math 3 97.51
3100 Water Bottles II Medium Math, Simulation 0 100.00
3099 Harshad Number Easy Math 0 100.00
3098 Find the Sum of Subsequence Powers Hard Array, Dynamic_Programming, Sorting 34 91.54
3097 Shortest Subarray With OR at Least K II Medium Array, Bit_Manipulation, Sliding_Window 7 98.43
3096 Minimum Levels to Gain More Points Medium Array, Prefix_Sum 3 99.97
3095 Shortest Subarray With OR at Least K I Easy Array, Bit_Manipulation, Sliding_Window 1 98.94
3093 Longest Common Suffix Queries Hard Array, String, Trie 39 93.67
3092 Most Frequent IDs Medium Array, Hash_Table, Heap_Priority_Queue, Ordered_Set 3 100.00
3091 Apply Operations to Make Sum of Array Greater Than or Equal to k Medium Math, Greedy, Enumeration 0 100.00
3090 Maximum Length Substring With Two Occurrences Easy String, Hash_Table, Sliding_Window 1 100.00
3086 Minimum Moves to Pick K Ones Hard Array, Greedy, Prefix_Sum, Sliding_Window 4 97.63
3085 Minimum Deletions to Make String K-Special Medium String, Hash_Table, Sorting, Greedy, Counting 4 100.00
3084 Count Substrings Starting and Ending with Given Character Medium String, Math, Counting 1 100.00
3083 Existence of a Substring in a String and Its Reverse Easy String, Hash_Table 1 99.84
3082 Find the Sum of the Power of All Subsequences Hard Array, Dynamic_Programming 1 100.00
3081 Replace Question Marks in String to Minimize Its Value Medium String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 12 99.56
3080 Mark Elements on Array by Performing Queries Medium Array, Hash_Table, Sorting, Heap_Priority_Queue, Simulation 50 99.96
3079 Find the Sum of Encrypted Integers Easy Array, Math 1 99.95
3077 Maximum Strength of K Disjoint Subarrays Hard Array, Dynamic_Programming, Prefix_Sum 20 97.16
3076 Shortest Uncommon Substring in an Array Medium Array, String, Hash_Table, Trie 9 99.97
3075 Maximize Happiness of Selected Children Medium Array, Sorting, Greedy 34 97.43
3074 Apple Redistribution into Boxes Easy Array, Sorting, Greedy 1 99.81
3072 Distribute Elements Into Two Arrays II Hard Array, Simulation, Segment_Tree, Binary_Indexed_Tree 48 99.90
3071 Minimum Operations to Write the Letter Y on a Grid Medium Array, Hash_Table, Matrix, Counting 1 100.00
3070 Count Submatrices with Top-Left Element and Sum Less Than k Medium Array, Matrix, Prefix_Sum 2 100.00
3069 Distribute Elements Into Two Arrays I Easy Array, Simulation 0 100.00
3068 Find the Maximum Sum of Node Values Hard Array, Dynamic_Programming, Sorting, Greedy, Tree, Bit_Manipulation 1 100.00
3067 Count Pairs of Connectable Servers in a Weighted Tree Network Medium Array, Depth_First_Search, Tree 69 99.83
3066 Minimum Operations to Exceed Threshold Value II Medium Array, Heap_Priority_Queue, Simulation 26 99.91
3065 Minimum Operations to Exceed Threshold Value I Easy Array 0 100.00
3049 Earliest Second to Mark Indices II Hard Array, Greedy, Binary_Search, Heap_Priority_Queue 5 92.03
3048 Earliest Second to Mark Indices I Medium Array, Binary_Search 2 91.18
3047 Find the Largest Area of Square Inside Two Rectangles Medium Array, Math, Geometry 50 97.63
3046 Split the Array Easy Array, Hash_Table, Counting 1 98.82
3045 Count Prefix and Suffix Pairs II Hard Array, String, Trie, Hash_Function, String_Matching, Rolling_Hash 19 100.00
3044 Most Frequent Prime Medium Array, Hash_Table, Math, Matrix, Counting, Enumeration, Number_Theory 6 100.00
3043 Find the Length of the Longest Common Prefix Medium Array, String, Hash_Table, Trie 27 99.94
3042 Count Prefix and Suffix Pairs I Easy Array, String, Trie, Hash_Function, String_Matching, Rolling_Hash 2 99.56
3041 Maximize Consecutive Elements in an Array After Modification Hard Array, Dynamic_Programming, Sorting 13 100.00
3040 Maximum Number of Operations With the Same Score II Medium Array, Dynamic_Programming, Memoization 3 99.75
3039 Apply Operations to Make String Empty Medium Array, Hash_Table, Sorting, Counting 18 93.00
3038 Maximum Number of Operations With the Same Score I Easy Array, Simulation 0 100.00
3036 Number of Subarrays That Match a Pattern II Hard Array, Hash_Function, String_Matching, Rolling_Hash 5 98.27
3035 Maximum Palindromes After Operations Medium Array, String, Hash_Table, Sorting, Greedy, Counting 4 99.13
3034 Number of Subarrays That Match a Pattern I Medium Array, Hash_Function, String_Matching, Rolling_Hash 1 100.00
3033 Modify the Matrix Easy Array, Matrix 1 100.00
3031 Minimum Time to Revert Word to Initial State II Hard String, Hash_Function, String_Matching, Rolling_Hash 24 74.98
3030 Find the Grid of Region Average Medium Array, Matrix 53 98.79
3029 Minimum Time to Revert Word to Initial State I Medium String, Hash_Function, String_Matching, Rolling_Hash 1 99.70
3028 Ant on the Boundary Easy Array, Simulation, Prefix_Sum 0 100.00
3027 Find the Number of Ways to Place People II Hard Array, Math, Sorting, Enumeration, Geometry 59 69.95
3026 Maximum Good Subarray Sum Medium Array, Hash_Table, Prefix_Sum 62 93.52
3025 Find the Number of Ways to Place People I Medium Array, Math, Sorting, Enumeration, Geometry 5 99.84
3024 Type of Triangle Easy Array, Math, Sorting 0 100.00
3022 Minimize OR of Remaining Elements Using Operations Hard Array, Greedy, Bit_Manipulation 43 78.48
3021 Alice and Bob Playing Flower Game Medium Math 0 100.00
3020 Find the Maximum Number of Elements in Subset Medium Array, Hash_Table, Enumeration 51 94.80
3019 Number of Changing Keys Easy String, Breadth_First_Search, Graph, Prefix_Sum 1 99.99
3017 Count the Number of Houses at a Certain Distance II Hard Breadth_First_Search, Graph, Prefix_Sum 6 93.62
3016 Minimum Number of Pushes to Type Word II Medium String, Hash_Table, Sorting, Greedy, Breadth_First_Search, Graph, Prefix_Sum, Counting 7 100.00
3015 Count the Number of Houses at a Certain Distance I Medium Breadth_First_Search, Graph, Prefix_Sum 2 98.98
3014 Minimum Number of Pushes to Type Word I Easy String, Math, Greedy 0 100.00
3013 Divide an Array Into Subarrays With Minimum Cost II Hard Array, Hash_Table, Heap_Priority_Queue, Sliding_Window 276 90.86
3012 Minimize Length of Array Using Operations Medium Array, Math, Greedy, Number_Theory 2 96.82
3011 Find if Array Can Be Sorted Medium Array, Sorting, Bit_Manipulation 1 100.00
3010 Divide an Array Into Subarrays With Minimum Cost I Easy Array, Sorting, Enumeration 1 99.09
3008 Find Beautiful Indices in the Given Array II Hard String, Binary_Search, Two_Pointers, Hash_Function, String_Matching, Rolling_Hash 36 99.66
3007 Maximum Number That Sum of the Prices Is Less Than or Equal to K Medium Dynamic_Programming, Binary_Search, Bit_Manipulation 1 100.00
3006 Find Beautiful Indices in the Given Array I Medium String, Binary_Search, Two_Pointers, Hash_Function, String_Matching, Rolling_Hash 8 95.86
3005 Count Elements With Maximum Frequency Easy Array, Hash_Table, Counting 1 99.76
3003 Maximize the Number of Partitions After Operations Hard String, Dynamic_Programming, Bit_Manipulation, Bitmask 1 100.00
3002 Maximum Size of a Set After Removals Medium Array, Hash_Table, Greedy 26 94.01
3001 Minimum Moves to Capture The Queen Medium Array, Enumeration 0 100.00
3000 Maximum Area of Longest Diagonal Rectangle Easy Array 1 99.67
2999 Count the Number of Powerful Integers Hard String, Dynamic_Programming, Math 1 100.00
2998 Minimum Number of Operations to Make X and Y Equal Medium Dynamic_Programming, Breadth_First_Search, Memoization 0 100.00
2997 Minimum Number of Operations to Make Array XOR Equal to K Medium Array, Bit_Manipulation 1 100.00
2996 Smallest Missing Integer Greater Than Sequential Prefix Sum Easy Array, Hash_Table, Sorting 1 93.13
2983 Palindrome Rearrangement Queries Hard String, Hash_Table, Prefix_Sum 14 88.19
2982 Find Longest Special Substring That Occurs Thrice II Medium String, Hash_Table, Binary_Search, Counting, Sliding_Window 18 99.35
2981 Find Longest Special Substring That Occurs Thrice I Medium String, Hash_Table, Binary_Search, Counting, Sliding_Window 6 89.21
2980 Check if Bitwise OR Has Trailing Zeros Easy Array, Bit_Manipulation 1 88.11
2977 Minimum Cost to Convert String II Hard Array, String, Dynamic_Programming, Graph, Trie, Shortest_Path 167 62.13
2976 Minimum Cost to Convert String I Medium Array, String, Graph, Shortest_Path 18 92.47
2975 Maximum Square Area by Removing Fences From a Field Medium Array, Hash_Table, Enumeration 413 78.25
2974 Minimum Number Game Easy Array, Sorting, Heap_Priority_Queue, Simulation 2 98.98
2973 Find Number of Coins to Place in Tree Nodes Hard Dynamic_Programming, Sorting, Depth_First_Search, Tree, Heap_Priority_Queue 93 72.11
2972 Count the Number of Incremovable Subarrays II Hard Array, Binary_Search, Two_Pointers 1 100.00
2971 Find Polygon With the Largest Perimeter Medium Array, Sorting, Greedy, Prefix_Sum 21 98.77
2970 Count the Number of Incremovable Subarrays I Easy Array, Binary_Search, Two_Pointers, Enumeration 0 100.00
2968 Apply Operations to Maximize Frequency Score Hard Array, Sorting, Binary_Search, Prefix_Sum, Sliding_Window 27 78.37
2967 Minimum Cost to Make Array Equalindromic Medium Array, Math, Sorting, Greedy 15 97.78
2966 Divide Array Into Arrays With Max Difference Medium Array, Sorting, Greedy 20 99.04
2965 Find Missing and Repeated Values Easy Array, Hash_Table, Math, Matrix 1 100.00
2963 Count the Number of Good Partitions Hard Array, Hash_Table, Math, Combinatorics 30 80.04
2962 Count Subarrays Where Max Element Appears at Least K Times Medium Array, Sliding_Window 3 100.00
2961 Double Modular Exponentiation Medium Array, Math, Simulation 1 100.00
2960 Count Tested Devices After Test Operations Easy Array, Simulation 0 100.00
2959 Number of Possible Sets of Closing Branches Hard Bit_Manipulation, Heap_Priority_Queue, Graph, Enumeration, Shortest_Path 36 83.41
2958 Length of Longest Subarray With at Most K Frequency Medium Array, Hash_Table, Sliding_Window 28 100.00
2957 Remove Adjacent Almost-Equal Characters Medium String, Dynamic_Programming, Greedy 1 100.00
2956 Find Common Elements Between Two Arrays Easy Array, Hash_Table 1 100.00
2954 Count the Number of Infection Sequences Hard Array, Math, Combinatorics 11 99.61
2953 Count Complete Substrings Hard String, Hash_Table, Sliding_Window 107 89.47
2952 Minimum Number of Coins to be Added Medium Array, Sorting, Greedy 21 98.49
2951 Find the Peaks Easy Array, Enumeration 1 100.00
2949 Count Beautiful Substrings II Hard String, Hash_Table, Math, Prefix_Sum, Number_Theory 29 92.10
2948 Make Lexicographically Smallest Array by Swapping Elements Medium Array, Sorting, Union_Find 41 99.61
2947 Count Beautiful Substrings I Medium String, Prefix_Sum, Enumeration 2 100.00
2946 Matrix Similarity After Cyclic Shifts Easy Array, Math, Matrix, Simulation 1 100.00
2945 Find Maximum Non-decreasing Array Length Hard Array, Dynamic_Programming, Binary_Search, Stack, Monotonic_Stack, Queue, Monotonic_Queue 11 98.10
2944 Minimum Number of Coins for Fruits Medium Array, Dynamic_Programming, Heap_Priority_Queue, Queue, Monotonic_Queue 2 99.43
2943 Maximize Area of Square Hole in Grid Medium Array, Sorting 2 100.00
2942 Find Words Containing Character Easy Array, String 2 72.65
2940 Find Building Where Alice and Bob Can Meet Hard Array, Binary_Search, Stack, Heap_Priority_Queue, Monotonic_Stack, Segment_Tree, Binary_Indexed_Tree 19 94.91
2939 Maximum Xor Product Medium Math, Greedy, Bit_Manipulation 1 100.00
2938 Separate Black and White Balls Medium String, Greedy, Two_Pointers 7 99.65
2937 Make Three Strings Equal Easy String 1 100.00
2935 Maximum Strong Pair XOR II Hard Array, Hash_Table, Bit_Manipulation, Sliding_Window, Trie 126 76.94
2934 Minimum Operations to Maximize Last Elements in Arrays Medium Array, Greedy 1 100.00
2933 High-Access Employees Medium Array, String, Hash_Table, Sorting 9 87.94
2932 Maximum Strong Pair XOR I Easy Array, Hash_Table, Bit_Manipulation, Sliding_Window, Trie 2 98.64
2931 Maximum Spending After Buying Items Hard Array, Sorting, Greedy, Matrix, Heap_Priority_Queue 18 79.00
2930 Number of Strings Which Can Be Rearranged to Contain Substring Medium Dynamic_Programming, Math, Combinatorics 1 80.56
2929 Distribute Candies Among Children II Medium Math, Enumeration, Combinatorics 0 100.00
2928 Distribute Candies Among Children I Easy Math, Enumeration, Combinatorics 1 98.72
2926 Maximum Balanced Subsequence Sum Hard Array, Dynamic_Programming, Binary_Search, Segment_Tree, Binary_Indexed_Tree 37 99.23
2925 Maximum Score After Applying Operations on a Tree Medium Dynamic_Programming, Depth_First_Search, Tree 22 79.74
2924 Find Champion II Medium Graph 1 100.00
2923 Find Champion I Easy Array, Matrix 1 96.00
2920 Maximum Points After Collecting Coins From All Nodes Hard Array, Dynamic_Programming, Depth_First_Search, Tree, Bit_Manipulation 113 77.94
2919 Minimum Increment Operations to Make Array Beautiful Medium Array, Dynamic_Programming 4 64.62
2918 Minimum Equal Sum of Two Arrays After Replacing Zeros Medium Array, Greedy 1 100.00
2917 Find the K-or of an Array Easy Array, Bit_Manipulation 2 96.79
2916 Subarrays Distinct Element Sum of Squares II Hard Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree 77 83.65
2915 Length of the Longest Subsequence That Sums to Target Medium Array, Dynamic_Programming 23 91.30
2914 Minimum Number of Changes to Make Binary String Beautiful Medium String 3 99.56
2913 Subarrays Distinct Element Sum of Squares I Easy Array, Hash_Table 1 100.00
2911 Minimum Changes to Make K Semi-palindromes Hard String, Dynamic_Programming, Two_Pointers 15 98.23
2910 Minimum Number of Groups to Create a Valid Assignment Medium Array, Hash_Table, Greedy 36 68.99
2909 Minimum Sum of Mountain Triplets II Medium Array 2 99.79
2908 Minimum Sum of Mountain Triplets I Easy Array 1 99.90
2906 Construct Product Matrix Medium Array, Matrix, Prefix_Sum 11 84.62
2905 Find Indices With Index and Value Difference II Medium Array 1 100.00
2904 Shortest and Lexicographically Smallest Beautiful String Medium String, Sliding_Window 1 100.00
2903 Find Indices With Index and Value Difference I Easy Array 1 99.89
2902 Count of Sub-Multisets With Bounded Sum Hard Array, Hash_Table, Dynamic_Programming, Sliding_Window 17 100.00
2901 Longest Unequal Adjacent Groups Subsequence II Medium Array, String, Dynamic_Programming 40 92.26
2900 Longest Unequal Adjacent Groups Subsequence I Easy Array, String, Dynamic_Programming, Greedy 1 100.00
2899 Last Visited Integers Easy Array, String, Simulation 2 96.41
2897 Apply Operations on Array to Maximize Sum of Squares Hard Array, Hash_Table, Greedy, Bit_Manipulation 29 98.00
2896 Apply Operations to Make Two Strings Equal Medium String, Dynamic_Programming 1 100.00
2895 Minimum Processing Time Medium Array, Sorting, Greedy 23 99.30
2894 Divisible and Non-divisible Sums Difference Easy Math 1 92.30
2891 Method Chaining Easy   412 99.23
2890 Reshape Data: Melt Easy   446 97.89
2889 Reshape Data: Pivot Easy   416 99.87
2888 Reshape Data: Concatenate Easy   441 96.26
2887 Fill Missing Data Easy   404 97.11
2886 Change Data Type Easy   421 94.57
2885 Rename Columns Easy   467 68.13
2884 Modify Columns Easy   401 96.35
2883 Drop Missing Data Easy   429 94.97
2882 Drop Duplicate Rows Easy   405 97.36
2881 Create a New Column Easy   437 81.98
2880 Select Data Easy   428 94.99
2879 Display the First Three Rows Easy   406 96.44
2878 Get the Size of a DataFrame Easy   413 94.68
2877 Create a DataFrame from List Easy   406 82.57
2876 Count Visited Nodes in a Directed Graph Hard Dynamic_Programming, Graph, Memoization 36 93.33
2875 Minimum Size Subarray in Infinite Array Medium Array, Hash_Table, Prefix_Sum, Sliding_Window 6 87.63
2874 Maximum Value of an Ordered Triplet II Medium Array 2 99.67
2873 Maximum Value of an Ordered Triplet I Easy Array 0 100.00
2872 Maximum Number of K-Divisible Components Hard Dynamic_Programming, Depth_First_Search, Tree 24 93.51
2871 Split Array Into Maximum Number of Subarrays Medium Array, Greedy, Bit_Manipulation 3 100.00
2870 Minimum Number of Operations to Make Array Empty Medium Array, Hash_Table, Greedy, Counting 6 98.16
2869 Minimum Operations to Collect Elements Easy Array, Hash_Table 1 100.00
2867 Count Valid Paths in a Tree Hard Dynamic_Programming, Math, Depth_First_Search, Tree, Number_Theory 26 97.33
2866 Beautiful Towers II Medium Array, Stack, Monotonic_Stack 35 89.02
2865 Beautiful Towers I Medium Array, Stack, Monotonic_Stack 13 74.26
2864 Maximum Odd Binary Number Easy String, Math, Greedy 1 100.00
2862 Maximum Element-Sum of a Complete Subset of Indices Hard Array, Math, Number_Theory 3 78.95
2861 Maximum Number of Alloys Medium Array, Binary_Search 16 91.51
2860 Happy Students Medium Array, Sorting, Enumeration 33 91.76
2859 Sum of Values at Indices With K Set Bits Easy Array, Bit_Manipulation 1 100.00
2858 Minimum Edge Reversals So Every Node Is Reachable Hard Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph 52 92.31
2857 Count Pairs of Points With Distance k Medium Array, Hash_Table, Bit_Manipulation 250 84.21
2856 Minimum Array Length After Pair Removals Medium Array, Hash_Table, Greedy, Binary_Search, Two_Pointers, Counting 5 97.63
2855 Minimum Right Shifts to Sort the Array Easy Array 1 100.00
2851 String Transformation Hard String, Dynamic_Programming, Math, String_Matching 54 78.45
2850 Minimum Moves to Spread Stones Over Grid Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix 1 100.00
2849 Determine if a Cell Is Reachable at a Given Time Medium Math 1 91.15
2848 Points That Intersect With Cars Easy Hash_Table, Math, Prefix_Sum 1 100.00
2846 Minimum Edge Weight Equilibrium Queries in a Tree Hard Array, Tree, Graph, Strongly_Connected_Component 74 66.04
2845 Count of Interesting Subarrays Medium Array, Hash_Table, Prefix_Sum 27 97.76
2844 Minimum Operations to Make a Special Number Medium String, Math, Greedy, Enumeration 1 100.00
2843 Count Symmetric Integers Easy Math, Enumeration 26 80.87
2842 Count K-Subsequences of a String With Maximum Beauty Hard String, Hash_Table, Math, Greedy, Combinatorics 5 80.91
2841 Maximum Sum of Almost Unique Subarray Medium Array, Hash_Table, Sliding_Window 18 97.37
2840 Check if Strings Can be Made Equal With Operations II Medium String, Hash_Table, Sorting 4 100.00
2839 Check if Strings Can be Made Equal With Operations I Easy String 1 99.09
2836 Maximize Value of Function in a Ball Passing Game Hard Array, Dynamic_Programming, Bit_Manipulation 235 45.00
2835 Minimum Operations to Form Subsequence With Target Sum Hard Array, Greedy, Bit_Manipulation 2 94.66
2834 Find the Minimum Possible Sum of a Beautiful Array Medium Math, Greedy 0 100.00
2833 Furthest Point From Origin Easy Array, Counting 1 100.00
2831 Find the Longest Equal Subarray Medium Array, Hash_Table, Binary_Search, Sliding_Window 15 96.81
2830 Maximize the Profit as the Salesman Medium Array, Dynamic_Programming, Sorting, Binary_Search 36 80.00
2829 Determine the Minimum Sum of a k-avoiding Array Medium Math, Greedy 1 100.00
2828 Check if a String Is an Acronym of Words Easy Array, String 1 100.00
2827 Number of Beautiful Integers in the Range Hard Dynamic_Programming, Math 7 96.77
2826 Sorting Three Groups Medium Array, Dynamic_Programming 4 100.00
2825 Make String a Subsequence Using Cyclic Increments Medium String, Two_Pointers 5 99.69
2824 Count Pairs Whose Sum is Less than Target Easy Array, Sorting, Two_Pointers 2 98.16
2818 Apply Operations to Maximize Score Hard Array, Math, Greedy, Stack, Monotonic_Stack, Number_Theory 94 100.00
2817 Minimum Absolute Difference Between Elements With Constraint Medium Array, Binary_Search, Ordered_Set 104 96.69
2816 Double a Number Represented as a Linked List Medium Math, Stack, Linked_List 4 81.41
2815 Max Pair Sum in an Array Easy Array, Hash_Table 8 67.30
2813 Maximum Elegance of a K-Length Subsequence Hard Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue 35 100.00
2812 Find the Safest Path in a Grid Medium Array, Breadth_First_Search, Binary_Search, Matrix, Union_Find 57 100.00
2811 Check if it is Possible to Split Array Medium Array, Dynamic_Programming, Greedy 1 98.31
2810 Faulty Keyboard Easy String, Simulation 3 96.04
2809 Minimum Time to Make Array Sum At Most x Hard Array, Dynamic_Programming, Sorting 14 100.00
2808 Minimum Seconds to Equalize a Circular Array Medium Array, Hash_Table, Greedy 59 88.86
2807 Insert Greatest Common Divisors in Linked List Medium Array, Math, Linked_List 1 100.00
2806 Account Balance After Rounded Purchase Easy Math 0 100.00
2801 Count Stepping Numbers in Range Hard String, Dynamic_Programming 22 74.37
2800 Shortest String That Contains Three Strings Medium String, Greedy, Enumeration 12 100.00
2799 Count Complete Subarrays in an Array Medium Array, Hash_Table, Sliding_Window 3 99.82
2798 Number of Employees Who Met the Target Easy Array, Enumeration 0 100.00
2791 Count Paths That Can Form a Palindrome in a Tree Hard Dynamic_Programming, Depth_First_Search, Tree, Bit_Manipulation, Bitmask 97 99.78
2790 Maximum Number of Groups With Increasing Length Hard Array, Math, Sorting, Greedy, Binary_Search 14 99.59
2789 Largest Element in an Array after Merge Operations Medium Array, Greedy, Prefix_Sum 1 100.00
2788 Split Strings by Separator Easy Array, String 3 99.98
2787 Ways to Express an Integer as Sum of Powers Medium Dynamic_Programming 12 98.96
2786 Visit Array Positions to Maximize Score Medium Array, Dynamic_Programming 5 100.00
2785 Sort Vowels in a String Medium String, Sorting 5 100.00
2784 Check if Array is Good Easy Array, Hash_Table, Sorting 1 99.49
2781 Length of the Longest Valid Substring Hard Array, String, Hash_Table, Sliding_Window 137 75.23
2780 Minimum Index of a Valid Split Medium Array, Hash_Table, Sorting 5 99.77
2779 Maximum Beauty of an Array After Applying Operation Medium Array, Sorting, Binary_Search, Sliding_Window 37 93.81
2778 Sum of Squares of Special Elements Easy Array, Simulation 1 100.00
2772 Apply Operations to Make All Array Elements Equal to Zero Medium Array, Prefix_Sum 1 100.00
2771 Longest Non-decreasing Subarray From Two Arrays Medium Array, Dynamic_Programming 4 97.62
2770 Maximum Number of Jumps to Reach the Last Index Medium Array, Dynamic_Programming 17 60.93
2769 Find the Maximum Achievable Number Easy Math 1 100.00
2768 Number of Black Blocks Medium Array, Hash_Table, Enumeration 94 98.91
2767 Partition String Into Minimum Beautiful Substrings Medium String, Hash_Table, Dynamic_Programming, Backtracking 1 100.00
2766 Relocate Marbles Medium Array, Hash_Table, Sorting, Simulation 47 91.67
2765 Longest Alternating Subarray Easy Array, Enumeration 2 82.60
2763 Sum of Imbalance Numbers of All Subarrays Hard Array, Hash_Table, Ordered_Set 1 100.00
2762 Continuous Subarrays Medium Array, Heap_Priority_Queue, Sliding_Window, Ordered_Set, Queue, Monotonic_Queue 3 98.28
2761 Prime Pairs With Target Sum Medium Array, Math, Enumeration, Number_Theory 57 99.24
2760 Longest Even Odd Subarray With Threshold Easy Array, Sliding_Window 4 96.92
2751 Robot Collisions Hard Array, Sorting, Stack, Simulation 29 98.29
2750 Ways to Split Array Into Good Subarrays Medium Array, Dynamic_Programming, Math 7 96.36
2749 Minimum Operations to Make the Integer Zero Medium Bit_Manipulation, Brainteaser 1 91.11
2748 Number of Beautiful Pairs Easy Array, Math, Number_Theory 11 91.00
2747 Count Zero Request Servers Medium Array, Hash_Table, Sorting, Sliding_Window 43 76.92
2746 Decremental String Concatenation Medium Array, String, Dynamic_Programming 34 85.89
2745 Construct the Longest New String Medium Math, Greedy, Brainteaser 1 100.00
2744 Find Maximum Number of String Pairs Easy Array, String, Hash_Table, Simulation 1 100.00
2742 Painting the Walls Hard Array, Dynamic_Programming 8 98.78
2741 Special Permutations Medium Array, Dynamic_Programming, Bit_Manipulation, Bitmask 105 96.58
2740 Find the Value of the Partition Medium Array, Sorting 18 100.00
2739 Total Distance Traveled Easy Math, Simulation 4 100.00
2736 Maximum Sum Queries Hard Array, Sorting, Binary_Search, Stack, Monotonic_Stack, Segment_Tree, Binary_Indexed_Tree 66 78.43
2735 Collecting Chocolates Medium Array, Enumeration 24 96.97
2734 Lexicographically Smallest String After Substring Operation Medium String, Greedy 12 86.26
2733 Neither Minimum nor Maximum Easy Array, Sorting 4 99.76
2732 Find a Good Subset of the Matrix Hard Array, Greedy, Matrix, Bit_Manipulation 7 70.65
2731 Movement of Robots Medium Array, Sorting, Prefix_Sum, Brainteaser 9 100.00
2730 Find the Longest Semi-Repetitive Substring Medium String, Sliding_Window 5 100.00
2729 Check if The Number is Fascinating Easy Hash_Table, Math 1 96.07
2727 Is Object Empty Easy   52 79.26
2726 Calculator with Method Chaining Easy   39 99.67
2725 Interval Cancellation Easy   51 98.87
2724 Sort By Easy   124 86.52
2723 Add Two Promises Easy   53 95.40
2722 Join Two Arrays by ID Medium   246 96.81
2721 Execute Asynchronous Functions in Parallel Medium   67 84.73
2719 Count of Integers Hard String, Dynamic_Programming, Math 15 97.70
2718 Sum of Matrix After Queries Medium Array, Hash_Table 3 100.00
2717 Semi-Ordered Permutation Easy Array, Simulation 3 100.00
2716 Minimize String Length Easy String, Hash_Table 3 100.00
2715 Timeout Cancellation Easy   53 97.68
2713 Maximum Strictly Increasing Cells in a Matrix Hard Array, Dynamic_Programming, Sorting, Binary_Search, Matrix, Memoization 116 96.53
2712 Minimum Cost to Make All Characters Equal Medium String, Dynamic_Programming, Greedy 7 94.19
2711 Difference of Number of Distinct Values on Diagonals Medium Array, Hash_Table, Matrix 7 90.98
2710 Remove Trailing Zeros From a String Easy String 1 100.00
2709 Greatest Common Divisor Traversal Hard Array, Math, Union_Find, Number_Theory 244 64.71
2708 Maximum Strength of a Group Medium Array, Sorting, Greedy, Backtracking 2 85.08
2707 Extra Characters in a String Medium Array, String, Hash_Table, Dynamic_Programming, Trie 37 74.40
2706 Buy Two Chocolates Easy Array, Sorting 1 100.00
2705 Compact Object Medium   80 88.30
2704 To Be Or Not To Be Easy   45 96.05
2703 Return Length of Arguments Passed Easy   49 86.01
2699 Modify Graph Edge Weights Hard Heap_Priority_Queue, Graph, Shortest_Path 88 85.25
2698 Find the Punishment Number of an Integer Medium Math, Backtracking 5 97.06
2697 Lexicographically Smallest Palindrome Easy String, Two_Pointers 6 93.45
2696 Minimum String Length After Removing Substrings Easy String, Stack, Simulation 44 97.86
2695 Array Wrapper Easy   44 97.86
2694 Event Emitter Medium   50 90.72
2693 Call Function with Custom Context Medium Array, Dynamic_Programming, Matrix 51 97.92
2685 Count the Number of Complete Components Medium Array, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Matrix, Graph 5 98.65
2684 Maximum Number of Moves in a Grid Medium Array, Dynamic_Programming, Matrix 3 99.53
2683 Neighboring Bitwise XOR Medium Array, Bit_Manipulation 2 100.00
2682 Find the Losers of the Circular Game Easy Array, Hash_Table, Simulation 1 100.00
2681 Power of Heroes Hard Array, Math, Sorting, Prefix_Sum 13 88.24
2680 Maximum OR Medium Array, Greedy, Bit_Manipulation, Prefix_Sum 2 100.00
2679 Sum in a Matrix Medium Array, Sorting, Matrix, Heap_Priority_Queue, Simulation 13 99.66
2678 Number of Senior Citizens Easy Array, String 0 100.00
2677 Chunk Array Easy   49 96.15
2673 Make Costs of Paths Equal in a Binary Tree Medium Array, Dynamic_Programming, Greedy, Tree, Binary_Tree 4 96.98
2672 Number of Adjacent Elements With the Same Color Medium Array 4 100.00
2671 Frequency Tracker Medium Hash_Table, Design 31 83.08
2670 Find the Distinct Difference Array Easy Array, Hash_Table 5 92.12
2667 Create Hello World Function Easy   45 94.20
2666 Allow One Function Call Easy   50 88.35
2665 Counter II Easy   54 94.09
2663 Lexicographically Smallest Beautiful String Hard String, Greedy 8 90.48
2662 Minimum Cost of a Path With Special Roads Medium Array, Heap_Priority_Queue, Graph, Shortest_Path 3 100.00
2661 First Completely Painted Row or Column Medium Array, Hash_Table, Matrix 22 85.61
2660 Determine the Winner of a Bowling Game Easy Array, Simulation 1 100.00
2659 Make Array Empty Hard Array, Sorting, Greedy, Binary_Search, Ordered_Set, Segment_Tree, Binary_Indexed_Tree 42 98.92
2658 Maximum Number of Fish in a Grid Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 3 100.00
2657 Find the Prefix Common Array of Two Arrays Medium Array, Hash_Table 2 99.04
2656 Maximum Sum With Exactly K Elements Easy Array, Greedy 1 100.00
2654 Minimum Number of Operations to Make All Array Elements Equal to 1 Medium Array, Math, Number_Theory 1 100.00
2653 Sliding Subarray Beauty Medium Array, Hash_Table, Sliding_Window 33 86.67
2652 Sum Multiples Easy Array, Math, Number_Theory 1 99.87
2651 Calculate Delayed Arrival Time Easy Math 0 100.00
2650 Design Cancellable Function Hard   58 93.15
2649 Nested Array Generator Medium   138 86.92
2648 Generate Fibonacci Sequence Easy   42 98.08
2646 Minimize the Total Price of the Trips Hard Array, Dynamic_Programming, Depth_First_Search, Tree, Graph 7 100.00
2645 Minimum Additions to Make Valid String Medium String, Dynamic_Programming, Greedy, Stack 1 100.00
2644 Find the Maximum Divisibility Score Easy Array 173 98.62
2643 Row With Maximum Ones Easy Array, Matrix 1 100.00
2642 Design Graph With Shortest Path Calculator Hard Design, Heap_Priority_Queue, Graph, Shortest_Path 94 81.68
2641 Cousins in Binary Tree II Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 24 72.10
2640 Find the Score of All Prefixes of an Array Medium Array, Prefix_Sum 3 70.00
2639 Find the Width of Columns of a Grid Easy Array, Matrix 2 99.70
2637 Promise Time Limit Medium   57 84.99
2635 Apply Transform Over Each Element in Array Easy   43 98.46
2634 Filter Elements from Array Easy   44 98.04
2631 Group By Medium   101 99.50
2630 Memoize II Hard   264 98.86
2629 Function Composition Easy   58 95.63
2627 Debounce Medium   50 98.23
2626 Array Reduce Transformation Easy   52 91.40
2625 Flatten Deeply Nested Array Medium   84 98.71
2624 Snail Traversal Medium   175 92.96
2623 Memoize Medium   264 97.20
2622 Cache With Time Limit Medium   51 94.82
2621 Sleep Easy   40 99.59
2620 Counter Easy   43 98.60
2619 Array Prototype Last Easy   41 98.99
2618 Check if Object Instance of Class Medium   82 99.55
2617 Minimum Number of Visited Cells in a Grid Hard Array, Dynamic_Programming, Binary_Search, Stack, Union_Find, Segment_Tree, Binary_Indexed_Tree 34 100.00
2616 Minimize the Maximum Difference of Pairs Medium Array, Greedy, Binary_Search 16 91.77
2615 Sum of Distances Medium Array, Hash_Table, Prefix_Sum 13 100.00
2614 Prime In Diagonal Easy Array, Math, Matrix, Number_Theory 0 100.00
2612 Minimum Reverse Operations Hard Array, Breadth_First_Search, Ordered_Set 19 100.00
2611 Mice and Cheese Medium Array, Sorting, Greedy, Heap_Priority_Queue 11 99.56
2610 Convert an Array Into a 2D Array With Conditions Medium Array, Hash_Table 2 97.24
2609 Find the Longest Balanced Substring of a Binary String Easy String 1 100.00
2608 Shortest Cycle in a Graph Hard Breadth_First_Search, Graph 11 100.00
2607 Make K-Subarray Sums Equal Medium Array, Math, Sorting, Number_Theory 24 99.15
2606 Find the Substring With Maximum Cost Medium Array, String, Hash_Table, Dynamic_Programming 3 100.00
2605 Form Smallest Number From Two Digit Arrays Easy Array, Hash_Table, Enumeration 1 95.34
2603 Collect Coins in a Tree Hard Array, Tree, Graph, Topological_Sort 26 100.00
2602 Minimum Operations to Make All Array Elements Equal Medium Array, Sorting, Binary_Search, Prefix_Sum 41 97.39
2601 Prime Subtraction Operation Medium Array, Math, Greedy, Binary_Search, Number_Theory 2 100.00
2600 K Items With the Maximum Sum Easy Math, Greedy 1 100.00
2598 Smallest Missing Non-negative Integer After Operations Medium Array, Hash_Table, Math, Greedy 4 99.19
2597 The Number of Beautiful Subsets Medium Array, Dynamic_Programming, Backtracking 4 100.00
2596 Check Knight Tour Configuration Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation 1 100.00
2595 Number of Even and Odd Bits Easy Bit_Manipulation 1 100.00
2594 Minimum Time to Repair Cars Medium Array, Binary_Search 15 97.28
2593 Find Score of an Array After Marking All Elements Medium Array, Sorting, Heap_Priority_Queue, Simulation 159 96.76
2592 Maximize Greatness of an Array Medium Array, Sorting, Greedy, Two_Pointers 8 100.00
2591 Distribute Money to Maximum Children Easy Math, Greedy 1 100.00
2589 Minimum Time to Complete All Tasks Hard Array, Sorting, Greedy, Binary_Search, Stack 19 97.26
2588 Count the Number of Beautiful Subarrays Medium Array, Hash_Table, Bit_Manipulation, Prefix_Sum 38 96.52
2587 Rearrange Array to Maximize Prefix Score Medium Array, Sorting, Greedy, Prefix_Sum 28 92.55
2586 Count the Number of Vowel Strings in Range Easy Array, String 1 100.00
2585 Number of Ways to Earn Points Hard Array, Dynamic_Programming 56 76.40
2584 Split the Array to Make Coprime Products Hard Array, Hash_Table, Math, Number_Theory 236 58.73
2583 Kth Largest Sum in a Binary Tree Medium Breadth_First_Search, Tree, Binary_Search 13 99.83
2582 Pass the Pillow Easy Math, Simulation 0 100.00
2581 Count Number of Possible Root Nodes Hard Hash_Table, Dynamic_Programming, Depth_First_Search, Tree 38 100.00
2580 Count Ways to Group Overlapping Ranges Medium Array, Sorting 16 98.28
2579 Count Total Number of Colored Cells Medium Math 0 100.00
2578 Split With Minimum Sum Easy Math, Sorting, Greedy 0 100.00
2577 Minimum Time to Visit a Cell In a Grid Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 132 85.82
2576 Find the Maximum Number of Marked Indices Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers 27 95.36
2575 Find the Divisibility Array of a String Medium Array, String, Math 6 100.00
2574 Left and Right Sum Differences Easy Array, Prefix_Sum 2 74.57
2573 Find the String with LCP Hard String, Dynamic_Programming, Greedy, Union_Find 5 100.00
2572 Count the Number of Square-Free Subsets Medium Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 1 100.00
2571 Minimum Operations to Reduce an Integer to 0 Medium Dynamic_Programming, Greedy, Bit_Manipulation 0 100.00
2570 Merge Two 2D Arrays by Summing Values Easy Array, Hash_Table, Two_Pointers 0 100.00
2569 Handling Sum Queries After Update Hard Array, Segment_Tree 27 94.87
2568 Minimum Impossible OR Medium Array, Bit_Manipulation, Brainteaser 14 81.48
2567 Minimum Score by Changing Two Elements Medium Array, Sorting, Greedy 15 98.21
2566 Maximum Difference by Remapping a Digit Easy Math, Greedy 1 98.06
2565 Subsequence With the Minimum Score Hard String, Binary_Search, Two_Pointers 7 92.54
2564 Substring XOR Queries Medium Array, String, Hash_Table, Bit_Manipulation 26 95.83
2563 Count the Number of Fair Pairs Medium Array, Sorting, Binary_Search, Two_Pointers 23 100.00
2562 Find the Array Concatenation Value Easy Array, Two_Pointers, Simulation 0 100.00
2561 Rearranging Fruits Hard Array, Hash_Table, Greedy 36 96.81
2560 House Robber IV Medium Array, Binary_Search 16 98.78
2559 Count Vowel Strings in Ranges Medium Array, String, Prefix_Sum 4 99.59
2558 Take Gifts From the Richest Pile Easy Array, Heap_Priority_Queue, Simulation 5 97.80
2556 Disconnect Path in a Binary Matrix by at Most One Flip Medium Array, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Matrix 0 100.00
2555 Maximize Win From Two Segments Medium Array, Binary_Search, Sliding_Window 5 90.10
2554 Maximum Number of Integers to Choose From a Range I Medium Array, Hash_Table, Sorting, Greedy, Binary_Search 4 100.00
2553 Separate the Digits in an Array Easy Array, Simulation 3 92.00
2552 Count Increasing Quadruplets Hard Array, Dynamic_Programming, Prefix_Sum, Enumeration, Binary_Indexed_Tree 48 97.29
2551 Put Marbles in Bags Hard Array, Sorting, Greedy, Heap_Priority_Queue 33 99.82
2550 Count Collisions of Monkeys on a Polygon Medium Math, Recursion 0 100.00
2549 Count Distinct Numbers on Board Easy Array, Hash_Table, Math, Simulation 0 100.00
2547 Minimum Cost to Split an Array Hard Array, Hash_Table, Dynamic_Programming, Counting 32 98.70
2546 Apply Bitwise Operations to Make Strings Equal Medium String, Bit_Manipulation 0 100.00
2545 Sort the Students by Their Kth Score Medium Array, Sorting, Matrix 1 99.50
2544 Alternating Digit Sum Easy Math 0 100.00
2543 Check if Point Is Reachable Hard Math, Number_Theory 0 100.00
2542 Maximum Subsequence Score Medium Array, Sorting, Greedy, Heap_Priority_Queue 94 84.75
2541 Minimum Operations to Make Array Equal II Medium Array, Math, Greedy 3 100.00
2540 Minimum Common Value Easy Array, Hash_Table, Binary_Search, Two_Pointers 0 100.00
2538 Difference Between Maximum and Minimum Price Sum Hard Array, Dynamic_Programming, Depth_First_Search, Tree 43 95.19
2537 Count the Number of Good Subarrays Medium Array, Hash_Table, Sliding_Window 38 99.07
2536 Increment Submatrices by One Medium Array, Matrix, Prefix_Sum 12 88.15
2535 Difference Between Element Sum and Digit Sum of an Array Easy Array, Math 3 77.42
2532 Time to Cross a Bridge Hard Array, Heap_Priority_Queue, Simulation 67 72.50
2531 Make Number of Distinct Characters Equal Medium String, Hash_Table, Counting 7 100.00
2530 Maximal Score After Applying K Operations Medium Array, Greedy, Heap_Priority_Queue 168 67.97
2529 Maximum Count of Positive Integer and Negative Integer Easy Array, Binary_Search, Counting 0 100.00
2528 Maximize the Minimum Powered City Hard Array, Greedy, Binary_Search, Prefix_Sum, Sliding_Window, Queue 51 77.59
2527 Find Xor-Beauty of Array Medium Array, Math, Bit_Manipulation 1 100.00
2526 Find Consecutive Integers from a Data Stream Medium Hash_Table, Design, Counting, Queue, Data_Stream 32 94.65
2525 Categorize Box According to Criteria Easy Math 0 100.00
2523 Closest Prime Numbers in Range Medium Math, Number_Theory 1 100.00
2522 Partition String Into Substrings With Values at Most K Medium String, Dynamic_Programming, Greedy 6 84.66
2521 Distinct Prime Factors of Product of Array Medium Array, Hash_Table, Math, Number_Theory 2 100.00
2520 Count the Digits That Divide a Number Easy Math 0 100.00
2518 Number of Great Partitions Hard Array, Dynamic_Programming 4 100.00
2517 Maximum Tastiness of Candy Basket Medium Array, Sorting, Binary_Search 38 100.00
2516 Take K of Each Character From Left and Right Medium String, Hash_Table, Sliding_Window 6 94.24
2515 Shortest Distance to Target String in a Circular Array Easy Array, String 1 62.21
2514 Count Anagrams Hard String, Hash_Table, Math, Counting, Combinatorics 22 100.00
2513 Minimize the Maximum of Two Arrays Medium Math, Binary_Search, Number_Theory 0 100.00
2512 Reward Top K Students Medium Array, String, Hash_Table, Sorting, Heap_Priority_Queue 72 94.76
2511 Maximum Enemy Forts That Can Be Captured Easy Array, Two_Pointers 0 100.00
2509 Cycle Length Queries in a Tree Hard Tree, Binary_Tree 12 99.26
2508 Add Edges to Make Degrees of All Nodes Even Hard Hash_Table, Graph 36 95.00
2507 Smallest Value After Replacing With Sum of Prime Factors Medium Math, Number_Theory 1 84.27
2506 Count Pairs Of Similar Strings Easy Array, String, Hash_Table 6 85.15
2503 Maximum Number of Points From Grid Queries Hard Array, Sorting, Breadth_First_Search, Heap_Priority_Queue, Union_Find 47 96.38
2502 Design Memory Allocator Medium Array, Hash_Table, Design, Simulation 9 100.00
2501 Longest Square Streak in an Array Medium Array, Hash_Table, Dynamic_Programming, Sorting, Binary_Search 4 99.73
2500 Delete Greatest Value in Each Row Easy Array, Sorting, Matrix 3 98.16
2499 Minimum Total Cost to Make Arrays Unequal Hard Array, Hash_Table, Greedy, Counting 3 100.00
2498 Frog Jump II Medium Array, Greedy, Binary_Search 1 100.00
2497 Maximum Star Sum of a Graph Medium Array, Sorting, Greedy, Heap_Priority_Queue, Graph 36 97.50
2496 Maximum Value of a String in an Array Easy Array, String 1 92.00
2493 Divide Nodes Into the Maximum Number of Groups Hard Breadth_First_Search, Graph, Union_Find 443 77.02
2492 Minimum Score of a Path Between Two Cities Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 13 92.82
2491 Divide Players Into Teams of Equal Skill Medium Array, Hash_Table, Sorting, Two_Pointers 21 70.31
2490 Circular Sentence Easy String 1 99.85
2488 Count Subarrays With Median K Hard Array, Hash_Table, Prefix_Sum 24 72.25
2487 Remove Nodes From Linked List Medium Stack, Linked_List, Monotonic_Stack, Recursion 5 99.79
2486 Append Characters to String to Make Subsequence Medium String, Greedy, Two_Pointers 2 99.89
2485 Find the Pivot Integer Easy Math, Prefix_Sum 1 95.67
2484 Count Palindromic Subsequences Hard String, Dynamic_Programming 93 76.16
2483 Minimum Penalty for a Shop Medium String, Prefix_Sum 17 69.62
2482 Difference Between Ones and Zeros in Row and Column Medium Array, Matrix, Simulation 9 94.05
2481 Minimum Cuts to Divide a Circle Easy Math, Geometry 0 100.00
2478 Number of Beautiful Partitions Hard String, Dynamic_Programming 44 90.08
2477 Minimum Fuel Cost to Report to the Capital Medium Depth_First_Search, Breadth_First_Search, Tree, Graph 70 72.49
2476 Closest Nodes Queries in a Binary Search Tree Medium Array, Depth_First_Search, Tree, Binary_Search, Binary_Tree 185 51.92
2475 Number of Unequal Triplets in Array Easy Array, Hash_Table 1 97.49
2472 Maximum Number of Non-overlapping Palindrome Substrings Hard String, Dynamic_Programming 2 91.04
2471 Minimum Number of Operations to Sort a Binary Tree by Level Medium Breadth_First_Search, Tree, Binary_Tree 76 76.46
2470 Number of Subarrays With LCM Equal to K Medium Array, Math, Number_Theory 23 62.35
2469 Convert the Temperature Easy Math 0 100.00
2468 Split Message Based on Limit Hard String, Binary_Search 27 99.08
2467 Most Profitable Path in a Tree Medium Array, Depth_First_Search, Breadth_First_Search, Tree, Graph 20 100.00
2466 Count Ways To Build Good Strings Medium Dynamic_Programming 8 99.59
2465 Number of Distinct Averages Easy Array, Hash_Table, Sorting, Two_Pointers 1 99.48
2463 Minimum Total Distance Traveled Hard Array, Dynamic_Programming, Sorting 2 100.00
2462 Total Cost to Hire K Workers Medium Array, Two_Pointers, Heap_Priority_Queue, Simulation 57 96.24
2461 Maximum Sum of Distinct Subarrays With Length K Medium Array, Hash_Table, Sliding_Window 40 93.40
2460 Apply Operations to an Array Easy Array, Simulation 1 87.93
2458 Height of Binary Tree After Subtree Removal Queries Hard Array, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 52 87.45
2457 Minimum Addition to Make Integer Beautiful Medium Math, Greedy 0 100.00
2456 Most Popular Video Creator Medium Array, String, Hash_Table, Sorting, Heap_Priority_Queue 57 97.10
2455 Average Value of Even Numbers That Are Divisible by Three Easy Array, Math 1 100.00
2454 Next Greater Element IV Hard Array, Sorting, Binary_Search, Stack, Heap_Priority_Queue, Monotonic_Stack 29 95.84
2453 Destroy Sequential Targets Medium Array, Hash_Table, Counting 33 96.27
2452 Words Within Two Edits of Dictionary Medium Array, String 16 70.33
2451 Odd String Difference Easy String, Hash_Table, Math 0 100.00
2449 Minimum Number of Operations to Make Arrays Similar Hard Array, Sorting, Greedy 57 87.86
2448 Minimum Cost to Make Array Equal Hard Array, Sorting, Binary_Search, Prefix_Sum 19 92.19
2447 Number of Subarrays With GCD Equal to K Medium Array, Math, Number_Theory 7 96.60
2446 Determine if Two Events Have Conflict Easy Array, String 0 100.00
2444 Count Subarrays With Fixed Bounds Hard Array, Sliding_Window, Queue, Monotonic_Queue 9 83.94
2443 Sum of Number and Its Reverse Medium Math, Enumeration 265 80.33
2442 Count Number of Distinct Integers After Reverse Operations Medium Array, Hash_Table, Math 73 96.81
2441 Largest Positive Integer That Exists With Its Negative Easy Array, Hash_Table 8 79.93
2440 Create Components With Same Value Hard Array, Math, Depth_First_Search, Tree, Enumeration 114 73.23
2439 Minimize Maximum of Array Medium Array, Dynamic_Programming, Greedy, Binary_Search, Prefix_Sum 10 90.25
2438 Range Product Queries of Powers Medium Array, Bit_Manipulation, Prefix_Sum 73 65.07
2437 Number of Valid Clock Times Easy String, Enumeration 0 100.00
2435 Paths in Matrix Whose Sum Is Divisible by K Hard Array, Dynamic_Programming, Matrix 70 99.20
2434 Using a Robot to Print the Lexicographically Smallest String Medium String, Hash_Table, Greedy, Stack 32 99.61
2433 Find The Original Array of Prefix Xor Medium Array, Bit_Manipulation 2 96.00
2432 The Employee That Worked on the Longest Task Easy Array 2 74.60
2430 Maximum Deletions on a String Hard String, Dynamic_Programming, Hash_Function, String_Matching, Rolling_Hash 159 93.39
2429 Minimize XOR Medium Greedy, Bit_Manipulation 0 100.00
2428 Maximum Sum of an Hourglass Medium Array, Matrix, Prefix_Sum 4 93.51
2427 Number of Common Factors Easy Math, Enumeration, Number_Theory 1 81.93
2426 Number of Pairs Satisfying Inequality Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 12 99.69
2425 Bitwise XOR of All Pairings Medium Array, Bit_Manipulation, Brainteaser 5 38.15
2424 Longest Uploaded Prefix Medium Binary_Search, Design, Heap_Priority_Queue, Union_Find, Ordered_Set, Segment_Tree, Binary_Indexed_Tree 35 99.68
2423 Remove Letter To Equalize Frequency Easy String, Hash_Table, Counting 1 75.41
2421 Number of Good Paths Hard Array, Tree, Graph, Union_Find 31 99.43
2420 Find All Good Indices Medium Array, Dynamic_Programming, Prefix_Sum 13 82.76
2419 Longest Subarray With Maximum Bitwise AND Medium Array, Bit_Manipulation, Brainteaser 4 83.94
2418 Sort the People Easy Array, String, Hash_Table, Sorting 3 99.81
2416 Sum of Prefix Scores of Strings Hard Array, String, Counting, Trie 179 94.98
2415 Reverse Odd Levels of Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 12 64.14
2414 Length of the Longest Alphabetical Continuous Substring Medium String 19 74.13
2413 Smallest Even Multiple Easy Math, Number_Theory 0 100.00
2412 Minimum Money Required Before Transactions Hard Array, Sorting, Greedy 4 97.57
2411 Smallest Subarrays With Maximum Bitwise OR Medium Array, Binary_Search, Bit_Manipulation, Sliding_Window 31 95.05
2410 Maximum Matching of Players With Trainers Medium Array, Sorting, Greedy, Two_Pointers 28 98.31
2409 Count Days Spent Together Easy String, Math 0 100.00
2407 Longest Increasing Subsequence II Hard Array, Dynamic_Programming, Divide_and_Conquer, Queue, Segment_Tree, Binary_Indexed_Tree, Monotonic_Queue 24 99.21
2406 Divide Intervals Into Minimum Number of Groups Medium Array, Sorting, Greedy, Two_Pointers, Heap_Priority_Queue, Prefix_Sum 144 71.27
2405 Optimal Partition of String Medium String, Hash_Table, Greedy 7 99.40
2404 Most Frequent Even Element Easy Array, Hash_Table, Counting 32 81.60
2402 Meeting Rooms III Hard Array, Sorting, Heap_Priority_Queue 124 72.79
2401 Longest Nice Subarray Medium Array, Bit_Manipulation, Sliding_Window 4 87.45
2400 Number of Ways to Reach a Position After Exactly k Steps Medium Dynamic_Programming, Math, Combinatorics 1 99.66
2399 Check Distances Between Same Letters Easy Array, String, Hash_Table 1 99.88
2398 Maximum Number of Robots Within Budget Hard Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue 15 99.75
2397 Maximum Rows Covered by Columns Medium Array, Matrix, Bit_Manipulation, Backtracking, Enumeration 1 100.00
2396 Strictly Palindromic Number Medium Math, Two_Pointers, Brainteaser 0 100.00
2395 Find Subarrays With Equal Sum Easy Array, Hash_Table 0 100.00
2392 Build a Matrix With Conditions Hard Array, Matrix, Graph, Topological_Sort 9 97.22
2391 Minimum Amount of Time to Collect Garbage Medium Array, String, Prefix_Sum 7 98.86
2390 Removing Stars From a String Medium String, Stack, Simulation 31 90.55
2389 Longest Subsequence With Limited Sum Easy Array, Sorting, Greedy, Binary_Search, Prefix_Sum 4 99.97
2386 Find the K-Sum of an Array Hard Array, Sorting, Heap_Priority_Queue 75 100.00
2385 Amount of Time for Binary Tree to Be Infected Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 20 100.00
2384 Largest Palindromic Number Medium String, Hash_Table, Greedy 26 100.00
2383 Minimum Hours of Training to Win a Competition Easy Array, Greedy 0 100.00
2382 Maximum Segment Sum After Removals Hard Array, Prefix_Sum, Union_Find, Ordered_Set 28 100.00
2381 Shifting Letters II Medium Array, String, Prefix_Sum 10 75.00
2380 Time Needed to Rearrange a Binary String Medium String, Dynamic_Programming, Simulation 3 70.00
2379 Minimum Recolors to Get K Consecutive Black Blocks Easy String, Sliding_Window 1 80.00
2376 Count Special Integers Hard Dynamic_Programming, Math 0 100.00
2375 Construct Smallest Number From DI String Medium String, Greedy, Stack, Backtracking 0 100.00
2374 Node With Highest Edge Score Medium Hash_Table, Graph 4 97.68
2373 Largest Local Values in a Matrix Easy Array, Matrix 2 99.97
2370 Longest Ideal Subsequence Medium String, Hash_Table, Dynamic_Programming 28 85.71
2369 Check if There is a Valid Partition For The Array Medium Array, Dynamic_Programming 7 81.82
2368 Reachable Nodes With Restrictions Medium Array, Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Graph 59 85.71
2367 Number of Arithmetic Triplets Easy Array, Hash_Table, Two_Pointers, Enumeration 3 66.67
2366 Minimum Replacements to Sort the Array Hard Array, Math, Greedy 10 28.57
2365 Task Scheduler II Medium Array, Hash_Table, Simulation 70 55.56
2364 Count Number of Bad Pairs Medium Array, Hash_Table 44 80.00
2363 Merge Similar Items Easy Array, Hash_Table, Sorting, Ordered_Set 3 100.00
2360 Longest Cycle in a Graph Hard Depth_First_Search, Graph, Topological_Sort 37 90.19
2359 Find Closest Node to Given Two Nodes Medium Depth_First_Search, Graph 18 89.33
2358 Maximum Number of Groups Entering a Competition Medium Array, Math, Greedy, Binary_Search 0 100.00
2357 Make Array Zero by Subtracting Equal Amounts Easy Array, Hash_Table, Sorting, Heap_Priority_Queue, Simulation 1 98.24
2356 Number of Unique Subjects Taught by Each Teacher Easy Database 964 79.65
2354 Number of Excellent Pairs Hard Array, Hash_Table, Binary_Search, Bit_Manipulation 80 86.77
2353 Design a Food Rating System Medium Hash_Table, Design, Heap_Priority_Queue, Ordered_Set 364 83.35
2352 Equal Row and Column Pairs Medium Array, Hash_Table, Matrix, Simulation 7 98.94
2351 First Letter to Appear Twice Easy String, Hash_Table, Counting 0 100.00
2350 Shortest Impossible Sequence of Rolls Hard Array, Hash_Table, Greedy 12 87.73
2349 Design a Number Container System Medium Hash_Table, Design, Heap_Priority_Queue, Ordered_Set 208 54.57
2348 Number of Zero-Filled Subarrays Medium Array, Math 3 99.90
2347 Best Poker Hand Easy Array, Hash_Table, Counting 1 76.92
2344 Minimum Deletions to Make Array Divisible Hard Array, Math, Sorting, Heap_Priority_Queue, Number_Theory 13 88.89
2343 Query Kth Smallest Trimmed Number Medium Array, String, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Radix_Sort 52 75.00
2342 Max Sum of a Pair With Equal Sum of Digits Medium Array, Hash_Table, Sorting, Heap_Priority_Queue 99 100.00
2341 Maximum Number of Pairs in Array Easy Array, Hash_Table, Sorting 2 80.00
2338 Count the Number of Ideal Arrays Hard Dynamic_Programming, Math, Number_Theory, Combinatorics 21 99.04
2337 Move Pieces to Obtain a String Medium String, Two_Pointers 23 82.39
2336 Smallest Number in Infinite Set Medium Hash_Table, Design, Heap_Priority_Queue 12 96.69
2335 Minimum Amount of Time to Fill Cups Easy Array, Greedy, Heap_Priority_Queue 1 97.92
2334 Subarray With Elements Greater Than Varying Threshold Hard Array, Stack, Union_Find, Monotonic_Stack 385 31.56
2333 Minimum Sum of Squared Difference Medium Array, Math, Sorting, Heap_Priority_Queue 15 95.13
2332 The Latest Time to Catch a Bus Medium Array, Sorting, Binary_Search, Two_Pointers 28 100.00
2331 Evaluate Boolean Binary Tree Easy Depth_First_Search, Tree, Binary_Search 0 100.00
2328 Number of Increasing Paths in a Grid Hard Array, Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Matrix, Graph, Memoization, Topological_Sort 43 100.00
2327 Number of People Aware of a Secret Medium Dynamic_Programming, Simulation, Queue 7 80.00
2326 Spiral Matrix IV Medium Array, Matrix, Simulation, Linked_List 12 85.48
2325 Decode the Message Easy String, Hash_Table 7 42.86
2322 Minimum Score After Removals on a Tree Hard Array, Depth_First_Search, Tree, Bit_Manipulation 255 70.70
2321 Maximum Score Of Spliced Array Hard Array, Dynamic_Programming 3 99.68
2320 Count Number of Ways to Place Houses Medium Dynamic_Programming 13 82.46
2319 Check if Matrix Is X-Matrix Easy Array, Matrix 3 53.58
2318 Number of Distinct Roll Sequences Hard Dynamic_Programming, Memoization 254 91.67
2317 Maximum XOR After Operations Medium Array, Math, Bit_Manipulation 1 100.00
2316 Count Unreachable Pairs of Nodes in an Undirected Graph Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 32 100.00
2315 Count Asterisks Easy String 1 100.00
2312 Selling Pieces of Wood Hard Backtracking 78 63.64
2311 Longest Binary Subsequence Less Than or Equal to K Medium String, Dynamic_Programming, Greedy, Memoization 1 100.00
2310 Sum of Numbers With Units Digit K Medium Math 1 66.67
2309 Greatest English Letter in Upper and Lower Case Easy Array 5 75.00
2306 Naming a Company Hard Array, String, Hash_Table, Bit_Manipulation, Enumeration 486 74.14
2305 Fair Distribution of Cookies Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 14 84.35
2304 Minimum Path Cost in a Grid Medium Array, Dynamic_Programming, Matrix 6 99.18
2303 Calculate Amount Paid in Taxes Easy Array, Simulation 1 92.41
2302 Count Subarrays With Score Less Than K Hard Array, Binary_Search, Prefix_Sum, Sliding_Window 4 88.77
2301 Match Substring After Replacement Hard Array, String, Hash_Table, String_Matching 205 94.20
2300 Successful Pairs of Spells and Potions Medium Array, Sorting, Binary_Search, Two_Pointers 85 71.70
2299 Strong Password Checker II Easy String 1 97.32
2296 Design a Text Editor Hard String, Stack, Design, Simulation, Linked_List, Doubly_Linked_List 238 87.02
2295 Replace Elements in an Array Medium Array, Hash_Table, Simulation 89 65.26
2294 Partition Array Such That Maximum Difference Is K Medium Array, Sorting, Greedy 35 94.09
2293 Min Max Game Easy Array, Simulation 1 90.39
2290 Minimum Obstacle Removal to Reach Corner Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 172 82.27
2289 Steps to Make Array Non-decreasing Medium Array, Stack, Linked_List, Monotonic_Stack 11 92.82
2288 Apply Discount to Prices Medium String 82 97.98
2287 Rearrange Characters to Make Target String Easy String, Hash_Table, Counting 1 87.39
2286 Booking Concert Tickets in Groups Hard Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree 283 67.08
2285 Maximum Total Importance of Roads Medium Sorting, Greedy, Heap_Priority_Queue, Graph 54 41.07
2284 Sender With Largest Word Count Medium Array, String, Hash_Table, Counting 42 95.64
2283 Check if Number Has Equal Digit Count and Digit Value Easy String, Hash_Table, Counting 1 99.36
2281 Sum of Total Strength of Wizards Hard Array, Stack, Prefix_Sum, Monotonic_Stack 142 68.92
2280 Minimum Lines to Represent a Line Chart Medium Array, Math, Sorting, Geometry, Number_Theory 40 96.09
2279 Maximum Bags With Full Capacity of Rocks Medium Array, Sorting, Greedy 17 91.12
2278 Percentage of Letter in String Easy String 0 100.00
2276 Count Integers in Intervals Hard Design, Ordered_Set, Segment_Tree 137 64.87
2275 Largest Combination With Bitwise AND Greater Than Zero Medium Array, Hash_Table, Bit_Manipulation, Counting 19 96.92
2274 Maximum Consecutive Floors Without Special Floors Medium Array, Sorting 33 99.36
2273 Find Resultant Array After Removing Anagrams Easy Array, String, Hash_Table, Sorting 2 99.10
2272 Substring With Largest Variance Hard Array, Dynamic_Programming 159 39.25
2271 Maximum White Tiles Covered by a Carpet Medium Array, Sorting, Greedy, Binary_Search, Prefix_Sum 74 71.51
2270 Number of Ways to Split Array Medium Array, Prefix_Sum 4 77.55
2269 Find the K-Beauty of a Number Easy String, Math, Sliding_Window 2 38.88
2267 Check if There Is a Valid Parentheses String Path Hard Array, Dynamic_Programming, Matrix 93 77.48
2266 Count Number of Texts Medium String, Hash_Table, Dynamic_Programming, Math 38 81.43
2265 Count Nodes Equal to Average of Subtree Medium Depth_First_Search, Tree, Binary_Tree 1 99.12
2264 Largest 3-Same-Digit Number in String Easy String 3 74.57
2262 Total Appeal of A String Hard String, Hash_Table, Dynamic_Programming 6 97.92
2261 K Divisible Elements Subarrays Medium Array, Hash_Table, Trie, Enumeration, Hash_Function, Rolling_Hash 73 92.32
2260 Minimum Consecutive Cards to Pick Up Medium Array, Hash_Table, Sliding_Window 50 97.04
2259 Remove Digit From Number to Maximize Result Easy String, Greedy, Enumeration 1 97.73
2258 Escape the Spreading Fire Hard Array, Breadth_First_Search, Binary_Search, Matrix 33 77.40
2257 Count Unguarded Cells in the Grid Medium Array, Matrix, Simulation 32 70.28
2256 Minimum Average Difference Medium Array, Prefix_Sum 15 97.85
2255 Count Prefixes of a Given String Easy Array, String 1 94.82
2251 Number of Flowers in Full Bloom Hard Array, Hash_Table, Sorting, Binary_Search, Prefix_Sum, Ordered_Set 113 69.23
2250 Count Number of Rectangles Containing Each Point Medium Array, Sorting, Binary_Search, Binary_Indexed_Tree 49 98.80
2249 Count Lattice Points Inside a Circle Medium Array, Hash_Table, Math, Enumeration, Geometry 54 92.07
2248 Intersection of Multiple Arrays Easy Array, Hash_Table, Counting 2 99.46
2246 Longest Path With Different Adjacent Characters Hard Array, String, Depth_First_Search, Tree, Graph, Topological_Sort 75 97.79
2245 Maximum Trailing Zeros in a Cornered Path Medium Array, Matrix, Prefix_Sum 96 88.49
2244 Minimum Rounds to Complete All Tasks Medium Array, Hash_Table, Greedy, Counting 13 94.26
2243 Calculate Digit Sum of a String Easy String, Simulation 1 91.46
2242 Maximum Score of a Node Sequence Hard Array, Sorting, Graph, Enumeration 28 97.57
2241 Design an ATM Machine Medium Array, Greedy, Design 55 94.44
2240 Number of Ways to Buy Pens and Pencils Medium Math, Enumeration 19 68.73
2239 Find Closest Number to Zero Easy Array 2 84.21
2236 Root Equals Sum of Children Easy Tree, Binary_Tree 0 100.00
2235 Add Two Integers Easy Math 1 48.94
2234 Maximum Total Beauty of the Gardens Hard Array, Sorting, Greedy, Binary_Search, Two_Pointers 63 73.03
2233 Maximum Product After K Increments Medium Array, Greedy, Heap_Priority_Queue 364 75.06
2232 Minimize Result by Adding Parentheses to Expression Medium String, Enumeration 1 99.60
2231 Largest Number After Digit Swaps by Parity Easy Sorting, Heap_Priority_Queue 1 98.32
2227 Encrypt and Decrypt Strings Hard Array, String, Hash_Table, Design, Trie 143 74.74
2226 Maximum Candies Allocated to K Children Medium Array, Binary_Search 46 78.19
2225 Find Players With Zero or One Losses Medium Array, Hash_Table, Sorting, Counting 96 87.03
2224 Minimum Number of Operations to Convert Time Easy String, Greedy 1 97.78
2223 Sum of Scores of Built Strings Hard String, Binary_Search, Hash_Function, String_Matching, Rolling_Hash, Suffix_Array 21 63.91
2222 Number of Ways to Select Buildings Medium String, Dynamic_Programming, Prefix_Sum 19 98.28
2221 Find Triangular Sum of an Array Medium Array, Math, Simulation, Combinatorics 78 83.64
2220 Minimum Bit Flips to Convert Number Easy Bit_Manipulation 1 67.86
2218 Maximum Value of K Coins From Piles Hard Array, Dynamic_Programming, Prefix_Sum 54 96.38
2217 Find Palindrome With Fixed Length Medium Array, Math 37 88.60
2216 Minimum Deletions to Make Array Beautiful Medium Array, Greedy, Stack 7 39.24
2215 Find the Difference of Two Arrays Easy Array, Hash_Table 11 87.39
2213 Longest Substring of One Repeating Character Hard Array, String, Ordered_Set, Segment_Tree 141 86.81
2212 Maximum Points in an Archery Competition Medium Array, Bit_Manipulation, Recursion, Enumeration 7 78.16
2211 Count Collisions on a Road Medium String, Stack 113 45.96
2210 Count Hills and Valleys in an Array Easy Array 0 100.00
2209 Minimum White Tiles After Covering With Carpets Hard String, Dynamic_Programming, Prefix_Sum 94 88.16
2208 Minimum Operations to Halve Array Sum Medium Array, Greedy, Heap_Priority_Queue 237 89.24
2207 Maximize Number of Subsequences in a String Medium String, Greedy, Prefix_Sum 8 100
2206 Divide Array Into Equal Pairs Easy Array, Hash_Table, Bit_Manipulation, Counting 1 100.00
2203 Minimum Weighted Subgraph With the Required Paths Hard Graph, Shortest_Path 92 97.26
2202 Maximize the Topmost Element After K Moves Medium Array, Greedy 1 100.00
2201 Count Artifacts That Can Be Extracted Medium Array, Hash_Table, Simulation 7 82.97
2200 Find All K-Distant Indices in an Array Easy Array 2 95.30
2197 Replace Non-Coprime Numbers in Array Hard Array, Math, Stack, Number_Theory 60 85.52
2196 Create Binary Tree From Descriptions Medium Array, Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 85 76.70
2195 Append K Integers With Minimal Sum Medium Array, Math, Sorting, Greedy 19 96.88
2194 Cells in a Range on an Excel Sheet Easy String 1 99.92
2193 Minimum Number of Moves to Make Palindrome Hard String, Greedy, Two_Pointers, Binary_Indexed_Tree 8 98.76
2192 All Ancestors of a Node in a Directed Acyclic Graph Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 82 90.80
2191 Sort the Jumbled Numbers Medium Array, Sorting 117 96.53
2190 Most Frequent Number Following Key In an Array Easy Array, Hash_Table, Counting 1 100.00
2188 Minimum Time to Finish the Race Hard Array, Dynamic_Programming 15 93.69
2187 Minimum Time to Complete Trips Medium Array, Binary_Search 187 95.03
2186 Minimum Number of Steps to Make Two Strings Anagram II Medium String, Hash_Table, Counting 22 77.11
2185 Counting Words With a Given Prefix Easy Array, String 0 100.00
2183 Count Array Pairs Divisible by K Hard Array, Math, Number_Theory 849 44.54
2182 Construct String With Repeat Limit Medium String, Greedy, Heap_Priority_Queue, Counting 26 96.11
2181 Merge Nodes in Between Zeros Medium Simulation, Linked_List 6 96.26
2180 Count Integers With Even Digit Sum Easy Math, Simulation 0 100.00
2179 Count Good Triplets in an Array Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 16 92.94
2178 Maximum Split of Positive Even Integers Medium Math, Greedy 16 78.96
2177 Find Three Consecutive Integers That Sum to a Given Number Medium Math, Simulation 1 78.46
2176 Count Equal and Divisible Pairs in an Array Easy Array 4 78.29
2172 Maximum AND Sum of Array Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 21 87.50
2171 Removing Minimum Number of Magic Beans Medium Array, Sorting, Prefix_Sum 42 77.68
2170 Minimum Operations to Make the Array Alternating Medium Array, Hash_Table, Greedy, Counting 8 100.00
2169 Count Operations to Obtain Zero Easy Math, Simulation 0 100.00
2167 Minimum Time to Remove All Cars Containing Illegal Goods Hard String, Dynamic_Programming 46 61.00
2166 Design Bitset Medium Array, Hash_Table, Design 81 73.38
2165 Smallest Value of the Rearranged Number Medium Math, Sorting 1 100.00
2164 Sort Even and Odd Indices Independently Easy Array, Sorting 2 97.22
2163 Minimum Difference in Sums After Removal of Elements Hard Array, Dynamic_Programming, Heap_Priority_Queue 298 57.14
2162 Minimum Cost to Set Cooking Time Medium Math, Enumeration 1 95.82
2161 Partition Array According to Given Pivot Medium Array, Two_Pointers, Simulation 7 72.76
2160 Minimum Sum of Four Digit Number After Splitting Digits Easy Math, Sorting, Greedy 1 78.31
2157 Groups of Strings Hard String, Bit_Manipulation, Union_Find 451 93.86
2156 Find Substring With Given Hash Value Hard String, Sliding_Window, Hash_Function, Rolling_Hash 37 36.57
2155 All Divisions With the Highest Score of a Binary Array Medium Array 18 98.41
2154 Keep Multiplying Found Values by Two Easy Array, Hash_Table, Sorting, Simulation 1 93.21
2151 Maximum Good People Based on Statements Hard Array, Bit_Manipulation, Backtracking, Enumeration 76 47.57
2150 Find All Lonely Numbers in the Array Medium Array, Hash_Table, Counting 93 70.66
2149 Rearrange Array Elements by Sign Medium Array, Two_Pointers, Simulation 10 34.66
2148 Count Elements With Strictly Smaller and Greater Elements Easy Array, Sorting 0 100.00
2147 Number of Ways to Divide a Long Corridor Hard String, Dynamic_Programming, Math 54 62.96
2146 K Highest Ranked Items Within a Price Range Medium Array, Sorting, Breadth_First_Search, Matrix, Heap_Priority_Queue 81 88.84
2145 Count the Hidden Sequences Medium Array, Prefix_Sum 7 36.03
2144 Minimum Cost of Buying Candies With Discount Easy Array, Sorting, Greedy 2 97.50
2141 Maximum Running Time of N Computers Hard Array, Sorting, Greedy, Binary_Search 24 70.39
2140 Solving Questions With Brainpower Medium Array, Dynamic_Programming 5 98.77
2139 Minimum Moves to Reach Target Score Medium Math, Greedy 1 37.95
2138 Divide a String Into Groups of Size k Easy String, Simulation 2 70.97
2136 Earliest Possible Day of Full Bloom Hard Array, Sorting, Greedy 63 94.92
2135 Count Words Obtained After Adding a Letter Medium Array, String, Hash_Table, Sorting, Bit_Manipulation 67 93.08
2134 Minimum Swaps to Group All 1’s Together II Medium Array, Sliding_Window 11 72.59
2133 Check if Every Row and Column Contains All Numbers Easy Array, Hash_Table, Matrix 32 64.12
2132 Stamping the Grid Hard Array, Greedy, Matrix, Prefix_Sum 7 100.00
2131 Longest Palindrome by Concatenating Two Letter Words Medium Array, String, Hash_Table, Greedy, Counting, Level_2_Day_5_Greedy 73 76.60
2130 Maximum Twin Sum of a Linked List Medium Two_Pointers, Stack, Linked_List 9 57.92
2129 Capitalize the Title Easy String 2 94.22
2127 Maximum Employees to Be Invited to a Meeting Hard Depth_First_Search, Graph, Topological_Sort 37 85.71
2126 Destroying Asteroids Medium Array, Sorting, Greedy 6 99.27
2125 Number of Laser Beams in a Bank Medium Array, String, Math, Matrix 19 76.00
2124 Check if All A’s Appears Before All B’s Easy String 1 73.82
2122 Recover the Original Array Hard Array, Hash_Table, Sorting, Enumeration 19 89.04
2121 Intervals Between Identical Elements Medium Array, Hash_Table, Prefix_Sum 93 79.63
2120 Execution of All Suffix Instructions Staying in a Grid Medium String, Simulation 31 88.00
2119 A Number After a Double Reversal Easy Math 0 100.00
2117 Abbreviating the Product of a Range Hard Math 70 89.47
2116 Check if a Parentheses String Can Be Valid Medium String, Greedy, Stack 19 85.53
2115 Find All Possible Recipes from Given Supplies Medium Array, String, Hash_Table, Graph, Topological_Sort 43 85.86
2114 Maximum Number of Words Found in Sentences Easy Array, String 4 69.59
2111 Minimum Operations to Make the Array K-Increasing Hard Array, Binary_Search 12 100.00
2110 Number of Smooth Descent Periods of a Stock Medium Array, Dynamic_Programming, Math 3 77.27
2109 Adding Spaces to a String Medium Array, String, Simulation 24 89.33
2108 Find First Palindromic String in the Array Easy Array, String, Two_Pointers 3 84.92
2106 Maximum Fruits Harvested After at Most K Steps Hard Array, Binary_Search, Prefix_Sum, Sliding_Window 4 86.67
2105 Watering Plants II Medium Array, Two_Pointers, Simulation 5 78.24
2104 Sum of Subarray Ranges Medium Array, Stack, Monotonic_Stack 21 77.85
2103 Rings and Rods Easy String, Hash_Table 2 46.84
2102 Sequentially Ordinal Rank Tracker Hard Design, Heap_Priority_Queue, Ordered_Set, Data_Stream 194 79.48
2101 Detonate the Maximum Bombs Medium Array, Math, Depth_First_Search, Breadth_First_Search, Graph, Geometry 27 94.17
2100 Find Good Days to Rob the Bank Medium Array, Dynamic_Programming, Prefix_Sum 13 46.46
2099 Find Subsequence of Length K With the Largest Sum Easy Array, Hash_Table, Sorting, Heap_Priority_Queue 6 85.46
2097 Valid Arrangement of Pairs Hard Depth_First_Search, Graph, Eulerian_Circuit 158 100.00
2096 Step-By-Step Directions From a Binary Tree Node to Another Medium String, Depth_First_Search, Tree, Binary_Tree 30 76.29
2095 Delete the Middle Node of a Linked List Medium Two_Pointers, Linked_List 4 95.21
2094 Finding 3-Digit Even Numbers Easy Array, Hash_Table, Sorting, Enumeration 2 99.62
2092 Find All People With Secret Hard Sorting, Depth_First_Search, Breadth_First_Search, Graph, Union_Find 95 84.86
2091 Removing Minimum and Maximum From Array Medium Array, Greedy 2 100.00
2090 K Radius Subarray Averages Medium Array, Sliding_Window 12 83.19
2089 Find Target Indices After Sorting Array Easy Array, Sorting, Binary_Search 1 97.90
2088 Count Fertile Pyramids in a Land Hard Array, Dynamic_Programming, Matrix 12 83.56
2087 Minimum Cost Homecoming of a Robot in a Grid Medium Array, Greedy, Matrix 2 79.89
2086 Minimum Number of Buckets Required to Collect Rainwater from Houses Medium String, Dynamic_Programming, Greedy 8 73.71
2085 Count Common Words With One Occurrence Easy Array, String, Hash_Table, Counting 6 77.66
2081 Sum of k-Mirror Numbers Hard Math, Enumeration 759 81.69
2080 Range Frequency Queries Medium Array, Hash_Table, Binary_Search, Design, Segment_Tree 140 97.86
2079 Watering Plants Medium Array 0 100.00
2078 Two Furthest Houses With Different Colors Easy Array, Greedy 0 100.00
2076 Process Restricted Friend Requests Hard Graph, Union_Find 102 55.25
2075 Decode the Slanted Ciphertext Medium String, Simulation 48 68.23
2074 Reverse Nodes in Even Length Groups Medium Linked_List 9 62.36
2073 Time Needed to Buy Tickets Easy Array, Simulation, Queue 0 100.00
2071 Maximum Number of Tasks You Can Assign Hard Array, Sorting, Greedy, Binary_Search, Queue, Monotonic_Queue 156 40.49
2070 Most Beautiful Item for Each Query Medium Array, Sorting, Binary_Search 53 96.04
2069 Walking Robot Simulation II Medium Design, Simulation 110 56.14
2068 Check Whether Two Strings are Almost Equivalent Easy String, Hash_Table, Counting 1 95.21
2065 Maximum Path Quality of a Graph Hard Array, Graph, Backtracking 94 95.34
2064 Minimized Maximum of Products Distributed to Any Store Medium Array, Binary_Search 65 70.18
2063 Vowels of All Substrings Medium String, Dynamic_Programming, Math, Combinatorics 21 34.49
2062 Count Vowel Substrings of a String Easy String, Hash_Table 1 99.82
2060 Check if an Original String Exists Given Two Encoded Strings Hard String, Dynamic_Programming 354 69.39
2059 Minimum Operations to Convert Number Medium Array, Breadth_First_Search 97 64.14
2058 Find the Minimum and Maximum Number of Nodes Between Critical Points Medium Linked_List 4 100.00
2057 Smallest Index With Equal Value Easy Array 1 94.39
2056 Number of Valid Move Combinations On Chessboard Hard Array, String, Simulation, Backtracking 195 41.18
2055 Plates Between Candles Medium Array, String, Binary_Search, Prefix_Sum 10 92.49
2054 Two Best Non-Overlapping Events Medium Array, Dynamic_Programming, Sorting, Binary_Search, Heap_Priority_Queue 58 70.59
2053 Kth Distinct String in an Array Easy Array, String, Hash_Table, Counting 7 65.75
2050 Parallel Courses III Hard Dynamic_Programming, Graph, Topological_Sort 33 86.04
2049 Count Nodes With the Highest Score Medium Array, Depth_First_Search, Tree, Binary_Tree 40 93.75
2048 Next Greater Numerically Balanced Number Medium Math, Backtracking, Enumeration 2 95.19
2047 Number of Valid Words in a Sentence Easy String 19 42.57
2045 Second Minimum Time to Reach Destination Hard Breadth_First_Search, Graph, Shortest_Path 65 74.03
2044 Count Number of Maximum Bitwise-OR Subsets Medium Array, Bit_Manipulation, Backtracking 12 58.97
2043 Simple Bank System Medium Array, Hash_Table, Design, Simulation 128 72.30
2042 Check if Numbers Are Ascending in a Sentence Easy String 2 75.46
2040 Kth Smallest Product of Two Sorted Arrays Hard Array, Binary_Search 635 75.24
2039 The Time When the Network Becomes Idle Medium Array, Breadth_First_Search, Graph 134 72.29
2038 Remove Colored Pieces if Both Neighbors are the Same Color Medium String, Math, Greedy, Game_Theory 22 47.78
2037 Minimum Number of Moves to Seat Everyone Easy Array, Sorting 2 99.31
2035 Partition Array Into Two Arrays to Minimize Sum Difference Hard Array, Dynamic_Programming, Binary_Search, Two_Pointers, Bit_Manipulation, Ordered_Set, Bitmask 1336 39.36
2034 Stock Price Fluctuation Medium Hash_Table, Design, Heap_Priority_Queue, Ordered_Set, Data_Stream 163 65.51
2033 Minimum Operations to Make a Uni-Value Grid Medium Array, Math, Sorting, Matrix 41 87.53
2032 Two Out of Three Easy Array, Hash_Table 9 45.56
2030 Smallest K-Length Subsequence With Occurrences of a Letter Hard String, Greedy, Stack, Monotonic_Stack 131 64.46
2029 Stone Game IX Medium Array, Math, Greedy, Counting, Game_Theory 14 53.97
2028 Find Missing Observations Medium Array, Math, Simulation 10 31.40
2027 Minimum Moves to Convert String Easy String, Greedy 0 100.00
2025 Maximum Number of Ways to Partition an Array Hard Array, Hash_Table, Prefix_Sum, Counting, Enumeration 172 100.00
2024 Maximize the Confusion of an Exam Medium String, Binary_Search, Prefix_Sum, Sliding_Window 21 44.78
2023 Number of Pairs of Strings With Concatenation Equal to Target Medium Array, String 36 36.00
2022 Convert 1D Array Into 2D Array Easy Array, Matrix, Simulation 8 40.41
2019 The Score of Students Solving Math Expression Hard Array, String, Dynamic_Programming, Math, Stack, Memoization 435 89.93
2018 Check if Word Can Be Placed In Crossword Medium Array, Matrix, Enumeration 11 52.76
2017 Grid Game Medium Array, Matrix, Prefix_Sum 10 41.46
2016 Maximum Difference Between Increasing Elements Easy Array 0 100.00
2014 Longest Subsequence Repeated k Times Hard String, Greedy, Backtracking, Counting, Enumeration 169 98.59
2013 Detect Squares Medium Array, Hash_Table, Design, Counting 67 88.46
2012 Sum of Beauty in the Array Medium Array 10 44.69
2011 Final Value of Variable After Performing Operations Easy Array, String, Simulation 1 94.40
2009 Minimum Number of Operations to Make Array Continuous Hard Array, Binary_Search 57 72.43
2008 Maximum Earnings From Taxi Medium Array, Dynamic_Programming, Sorting, Binary_Search 116 55.59
2007 Find Original Array From Doubled Array Medium Array, Hash_Table, Sorting, Greedy 41 96.48
2006 Count Number of Pairs With Absolute Difference K Easy Array, Hash_Table, Counting 8 58.60
2003 Smallest Missing Genetic Value in Each Subtree Hard Dynamic_Programming, Depth_First_Search, Tree, Union_Find 126 85.18
2002 Maximum Product of the Length of Two Palindromic Subsequences Medium String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 69 89.94
2001 Number of Pairs of Interchangeable Rectangles Medium Array, Hash_Table, Math, Counting, Number_Theory 34 99.02
2000 Reverse Prefix of Word Easy String, Two_Pointers 0 100.00
1998 GCD Sort of an Array Hard Array, Math, Sorting, Union_Find 51 100.00
1997 First Day Where You Have Been in All the Rooms Medium Array, Dynamic_Programming 14 83.10
1996 The Number of Weak Characters in the Game Medium Array, Sorting, Greedy, Stack, Monotonic_Stack 121 81.46
1995 Count Special Quadruplets Easy Array, Enumeration 2 99.20
1994 The Number of Good Subsets Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 15 94.29
1993 Operations on Tree Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Design 58 99.38
1992 Find All Groups of Farmland Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 7 89.08
1991 Find the Middle Index in Array Easy Array, Prefix_Sum 0 100.00
1987 Number of Unique Good Subsequences Hard String, Dynamic_Programming 19 53.78
1986 Minimum Number of Work Sessions to Finish the Tasks Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 2 90.18
1985 Find the Kth Largest Integer in the Array Medium Array, String, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect 34 77.42
1984 Minimum Difference Between Highest and Lowest of K Scores Easy Array, Sorting, Sliding_Window 4 95.43
1982 Find Array Given Subset Sums Hard Array, Divide_and_Conquer 70 64.91
1981 Minimize the Difference Between Target and Chosen Elements Medium Array, Dynamic_Programming, Matrix 480 90.78
1980 Find Unique Binary String Medium Array, String, Backtracking 7 31.88
1979 Find Greatest Common Divisor of Array Easy Array, Math, Number_Theory 1 87.75
1978 Employees Whose Manager Left the Company Easy Database 719 64.69
1977 Number of Ways to Separate Numbers Hard String, Dynamic_Programming, Suffix_Array 604 59.21
1976 Number of Ways to Arrive at Destination Medium Dynamic_Programming, Graph, Topological_Sort, Shortest_Path 14 77.59
1975 Maximum Matrix Sum Medium Array, Greedy, Matrix 4 100.00
1974 Minimum Time to Type Word Using Special Typewriter Easy String, Greedy 1 74.90
1971 Find if Path Exists in Graph Easy Depth_First_Search, Breadth_First_Search, Graph 4 99.57
1970 Last Day Where You Can Still Cross Hard Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Union_Find 14 95.24
1969 Minimum Non-Zero Product of the Array Elements Medium Math, Greedy, Recursion 0 100.00
1968 Array With Elements Not Equal to Average of Neighbors Medium Array, Sorting, Greedy 6 92.86
1967 Number of Strings That Appear as Substrings in Word Easy String 1 82.02
1965 Employees With Missing Information Easy Database, SQL_I_Day_4_Union_and_Select 617 30.40
1964 Find the Longest Valid Obstacle Course at Each Position Hard Array, Binary_Search, Binary_Indexed_Tree 79 85.00
1963 Minimum Number of Swaps to Make the String Balanced Medium String, Greedy, Two_Pointers, Stack 17 93.71
1962 Remove Stones to Minimize the Total Medium Array, Heap_Priority_Queue 761 48.67
1961 Check If String Is a Prefix of Array Easy Array, String 2 60.87
1960 Maximum Product of the Length of Two Palindromic Substrings Hard String, Hash_Function, Rolling_Hash 32 75.00
1959 Minimum Total Space Wasted With K Resizing Operations Medium Array, Dynamic_Programming 42 95.45
1958 Check if Move is Legal Medium Array, Matrix, Enumeration 0 100.00
1957 Delete Characters to Make Fancy String Easy String 54 52.94
1955 Count Number of Special Subsequences Hard Array, Dynamic_Programming 22 80.65
1954 Minimum Garden Perimeter to Collect Enough Apples Medium Math, Binary_Search 2 59.57
1953 Maximum Number of Weeks for Which You Can Work Medium Array, Greedy 4 40.93
1952 Three Divisors Easy Math 1 84.91
1948 Delete Duplicate Folders in System Hard Array, String, Hash_Table, Trie, Hash_Function 92 97.82
1947 Maximum Compatibility Score Sum Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 2 95.90
1946 Largest Number After Mutating Substring Medium Array, String, Greedy 18 70.91
1945 Sum of Digits of String After Convert Easy String, Simulation 2 72.10
1944 Number of Visible People in a Queue Hard Array, Stack, Monotonic_Stack 9 99.65
1943 Describe the Painting Medium Array, Prefix_Sum 29 93.92
1942 The Number of the Smallest Unoccupied Chair Medium Array, Heap_Priority_Queue, Ordered_Set 73 49.69
1941 Check if All Characters Have Equal Number of Occurrences Easy String, Hash_Table, Counting 2 86.25
1938 Maximum Genetic Difference Query Hard Array, Bit_Manipulation, Trie 174 100.00
1937 Maximum Number of Points with Cost Medium Array, Dynamic_Programming 18 44.04
1936 Add Minimum Number of Rungs Medium Array, Greedy 1 100.00
1935 Maximum Number of Words You Can Type Easy String, Hash_Table 2 95.06
1934 Confirmation Rate Medium Database 1432 68.14
1932 Merge BSTs to Create Single BST Hard Hash_Table, Depth_First_Search, Tree, Binary_Search, Binary_Tree 87 48.43
1931 Painting a Grid With Three Different Colors Hard Dynamic_Programming 4 100.00
1930 Unique Length-3 Palindromic Subsequences Medium String, Hash_Table, Prefix_Sum 31 93.44
1929 Concatenation of Array Easy Array 1 92.52
1928 Minimum Cost to Reach Destination in Time Hard Dynamic_Programming, Graph 52 87.97
1927 Sum Game Medium Math, Greedy, Game_Theory 13 34.41
1926 Nearest Exit from Entrance in Maze Medium Array, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems 12 40.55
1925 Count Square Sum Triples Easy Math, Enumeration 25 48.78
1923 Longest Common Subpath Hard Array, Binary_Search, Hash_Function, Rolling_Hash, Suffix_Array 517 73.88
1922 Count Good Numbers Medium Math, Recursion 1 87.11
1921 Eliminate Maximum Number of Monsters Medium Array, Sorting, Greedy 19 90.78
1920 Build Array from Permutation Easy Array, Simulation 1 94.23
1916 Count Ways to Build Rooms in an Ant Colony Hard Dynamic_Programming, Math, Tree, Graph, Topological_Sort, Combinatorics 1527 34.38
1915 Number of Wonderful Substrings Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 31 82.46
1914 Cyclically Rotating a Grid Medium Array, Matrix, Simulation 2 91.30
1913 Maximum Product Difference Between Two Pairs Easy Array, Sorting 7 70.01
1912 Design Movie Rental System Hard Array, Hash_Table, Design, Heap_Priority_Queue, Ordered_Set 562 74.14
1911 Maximum Alternating Subsequence Sum Medium Array, Dynamic_Programming 12 51.75
1910 Remove All Occurrences of a Substring Medium String 11 39.18
1909 Remove One Element to Make the Array Strictly Increasing Easy Array 0 100.00
1907 Count Salary Categories Medium Database 2216 95.81
1906 Minimum Absolute Difference Queries Medium Array, Hash_Table 176 71.61
1905 Count Sub Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems 24 85.54
1904 The Number of Full Rounds You Have Played Medium String, Math 0 100.00
1903 Largest Odd Number in String Easy String, Math, Greedy 1 100.00
1901 Find a Peak Element II Medium Array, Binary_Search, Matrix, Divide_and_Conquer, Binary_Search_II_Day_17 0 100.00
1900 The Earliest and Latest Rounds Where Players Compete Hard Dynamic_Programming, Memoization 1 92.68
1899 Merge Triplets to Form Target Triplet Medium Array, Greedy 1 98.96
1898 Maximum Number of Removable Characters Medium Array, String, Binary_Search, Binary_Search_II_Day_6 121 72.51
1897 Redistribute Characters to Make All Strings Equal Easy String, Hash_Table, Counting 2 100.00
1896 Minimum Cost to Change the Final Value of Expression Hard String, Dynamic_Programming, Math, Stack 29 95.24
1895 Largest Magic Square Medium Array, Matrix, Prefix_Sum 7 80.72
1894 Find the Student that Will Replace the Chalk Medium Array, Binary_Search, Simulation, Prefix_Sum, Binary_Search_II_Day_2 2 76.67
1893 Check if All the Integers in a Range Are Covered Easy Array, Hash_Table, Prefix_Sum 1 72.81
1890 The Latest Login in 2020 Easy Database, SQL_I_Day_8_Function 571 73.59
1889 Minimum Space Wasted From Packaging Hard Array, Sorting, Binary_Search, Prefix_Sum 98 45.92
1888 Minimum Number of Flips to Make the Binary String Alternating Medium String, Greedy 30 75.70
1887 Reduction Operations to Make the Array Elements Equal Medium Array, Sorting 26 94.56
1886 Determine Whether Matrix Can Be Obtained By Rotation Easy Array, Matrix, Programming_Skills_II_Day_7 1 78.38
1884 Egg Drop With 2 Eggs and N Floors Medium Dynamic_Programming, Math 0 100.00
1883 Minimum Skips to Arrive at Meeting On Time Hard Array, Dynamic_Programming 70 73.08
1882 Process Tasks Using Servers Medium Array, Heap_Priority_Queue 290 77.45
1881 Maximum Value after Insertion Medium String, Greedy 12 85.08
1880 Check if Word Equals Summation of Two Words Easy String 2 31.97
1879 Minimum XOR Sum of Two Arrays Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 15 63.49
1878 Get Biggest Three Rhombus Sums in a Grid Medium Array, Math, Sorting, Matrix, Heap_Priority_Queue, Prefix_Sum 41 82.03
1877 Minimize Maximum Pair Sum in Array Medium Array, Sorting, Greedy, Two_Pointers 62 82.87
1876 Substrings of Size Three with Distinct Characters Easy String, Hash_Table, Counting, Sliding_Window 2 60.62
1873 Calculate Special Bonus Easy Database, SQL_I_Day_2_Select_and_Order 543 71.60
1872 Stone Game VIII Hard Array, Dynamic_Programming, Math, Prefix_Sum, Game_Theory 3 98.18
1871 Jump Game VII Medium String, Two_Pointers, Prefix_Sum 14 76.25
1870 Minimum Speed to Arrive on Time Medium Array, Binary_Search, Binary_Search_II_Day_6 86 88.58
1869 Longer Contiguous Segments of Ones than Zeros Easy String 1 88.10
1866 Number of Ways to Rearrange Sticks With K Sticks Visible Hard Dynamic_Programming, Math, Combinatorics 67 96.33
1865 Finding Pairs With a Certain Sum Medium Array, Hash_Table, Design 195 83.97
1864 Minimum Number of Swaps to Make the Binary String Alternating Medium String, Greedy 3 43.20
1863 Sum of All Subset XOR Totals Easy Array, Math, Bit_Manipulation, Backtracking, Combinatorics 0 100.00
1862 Sum of Floored Pairs Hard Array, Math, Binary_Search, Prefix_Sum 115 70.91
1861 Rotating the Box Medium Array, Matrix, Two_Pointers 8 92.84
1860 Incremental Memory Leak Medium Simulation 5 78.57
1859 Sorting the Sentence Easy String, Sorting 2 50.32
1857 Largest Color Value in a Directed Graph Hard Hash_Table, Dynamic_Programming, Graph, Counting, Memoization, Topological_Sort 110 73.53
1856 Maximum Subarray Min-Product Medium Array, Stack, Prefix_Sum, Monotonic_Stack 28 92.10
1855 Maximum Distance Between a Pair of Values Medium Array, Greedy, Binary_Search, Two_Pointers, Binary_Search_I_Day_11 4 62.20
1854 Maximum Population Year Easy Array, Counting 0 100.00
1851 Minimum Interval to Include Each Query Hard Array, Sorting, Binary_Search, Heap_Priority_Queue, Line_Sweep 140 84.24
1850 Minimum Adjacent Swaps to Reach the Kth Smallest Number Medium String, Greedy, Two_Pointers 24 72.99
1849 Splitting a String Into Descending Consecutive Values Medium String, Backtracking 1 87.61
1848 Minimum Distance to the Target Element Easy Array 1 58.33
1847 Closest Room Hard Array, Sorting, Binary_Search 95 81.67
1846 Maximum Element After Decreasing and Rearranging Medium Array, Sorting, Greedy 4 93.59
1845 Seat Reservation Manager Medium Design, Heap_Priority_Queue, Programming_Skills_II_Day_17 47 87.63
1844 Replace All Digits with Characters Easy String 1 70.12
1840 Maximum Building Height Hard Array, Math 59 94.64
1839 Longest Substring Of All Vowels in Order Medium String, Sliding_Window 24 86.13
1838 Frequency of the Most Frequent Element Medium Array, Sorting, Greedy, Binary_Search, Prefix_Sum, Sliding_Window, Binary_Search_II_Day_9 11 100.00
1837 Sum of Digits in Base K Easy Math 1 10.42
1835 Find XOR Sum of All Pairs Bitwise AND Hard Array, Math, Bit_Manipulation 1 100.00
1834 Single-Threaded CPU Medium Array, Sorting, Heap_Priority_Queue 134 83.22
1833 Maximum Ice Cream Bars Medium Array, Sorting, Greedy 39 84.49
1832 Check if the Sentence Is Pangram Easy String, Hash_Table 3 41.29
1830 Minimum Number of Operations to Make String Sorted Hard String, Math, Combinatorics 125 94.12
1829 Maximum XOR for Each Query Medium Array, Bit_Manipulation, Prefix_Sum 5 61.24
1828 Queries on Number of Points Inside a Circle Medium Array, Math, Geometry 23 75.03
1827 Minimum Operations to Make the Array Increasing Easy Array, Greedy 4 35.67
1825 Finding MK Average Hard Design, Heap_Priority_Queue, Ordered_Set, Queue 83 60.59
1824 Minimum Sideway Jumps Medium Array, Dynamic_Programming, Greedy 17 96.34
1823 Find the Winner of the Circular Game Medium Array, Math, Simulation, Recursion, Queue, Data_Structure_II_Day_14_Stack_Queue 3 64.85
1822 Sign of the Product of an Array Easy Array, Math, Programming_Skills_I_Day_4_Loop 1 58.05
1819 Number of Different Subsequences GCDs Hard Array, Math, Counting, Number_Theory 116 96.43
1818 Minimum Absolute Sum Difference Medium Array, Sorting, Binary_Search, Ordered_Set, Binary_Search_II_Day_7 13 99.44
1817 Finding the Users Active Minutes Medium Array, Hash_Table 16 91.64
1816 Truncate Sentence Easy Array, String 2 65.71
1815 Maximum Number of Groups Getting Fresh Donuts Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization 7 86.67
1814 Count Nice Pairs in an Array Medium Array, Hash_Table, Math, Counting 47 83.12
1813 Sentence Similarity III Medium Array, String, Two_Pointers 3 41.38
1812 Determine Color of a Chessboard Square Easy String, Math 1 49.36
1808 Maximize Number of Nice Divisors Hard Math, Recursion 1 80.77
1807 Evaluate the Bracket Pairs of a String Medium Array, String, Hash_Table 40 80.47
1806 Minimum Number of Operations to Reinitialize a Permutation Medium Array, Math, Simulation 0 100.00
1805 Number of Different Integers in a String Easy String, Hash_Table 3 79.55
1803 Count Pairs With XOR in a Range Hard Array, Bit_Manipulation, Trie 77 100.00
1802 Maximum Value at a Given Index in a Bounded Array Medium Greedy, Binary_Search, Binary_Search_II_Day_17 2 58.44
1801 Number of Orders in the Backlog Medium Array, Heap_Priority_Queue, Simulation 39 78.46
1800 Maximum Ascending Subarray Sum Easy Array 0 100.00
1799 Maximize Score After N Operations Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask, Number_Theory 164 78.22
1798 Maximum Number of Consecutive Values You Can Make Medium Array, Greedy 11 96.30
1797 Design Authentication Manager Medium Hash_Table, Design, Programming_Skills_II_Day_19 41 92.67
1796 Second Largest Digit in a String Easy String, Hash_Table 2 87.67
1795 Rearrange Products Table Easy Database, SQL_I_Day_4_Union_and_Select 497 64.83
1793 Maximum Score of a Good Subarray Hard Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack 3 97.56
1792 Maximum Average Pass Ratio Medium Array, Greedy, Heap_Priority_Queue 456 89.78
1791 Find Center of Star Graph Easy Graph 0 100.00
1790 Check if One String Swap Can Make Strings Equal Easy String, Hash_Table, Counting, Programming_Skills_I_Day_4_Loop 0 100.00
1789 Primary Department for Each Employee Easy Database 1122 74.47
1787 Make the XOR of All Segments Equal to Zero Hard Array, Dynamic_Programming, Bit_Manipulation 102 89.47
1786 Number of Restricted Paths From First to Last Node Medium Dynamic_Programming, Heap_Priority_Queue, Graph, Topological_Sort, Shortest_Path 86 88.56
1785 Minimum Elements to Add to Form a Given Sum Medium Array, Greedy 2 70.75
1784 Check if Binary String Has at Most One Segment of Ones Easy String 1 65.60
1782 Count Pairs Of Nodes Hard Binary_Search, Two_Pointers, Graph 128 86.96
1781 Sum of Beauty of All Substrings Medium String, Hash_Table, Counting 38 100.00
1780 Check if Number is a Sum of Powers of Three Medium Math 0 100.00
1779 Find Nearest Point That Has the Same X or Y Coordinate Easy Array, Programming_Skills_I_Day_3_Conditional_Statements 1 100.00
1776 Car Fleet II Hard Array, Math, Stack, Heap_Priority_Queue, Monotonic_Stack 19 93.81
1775 Equal Sum Arrays With Minimum Number of Operations Medium Array, Hash_Table, Greedy, Counting 16 70.88
1774 Closest Dessert Cost Medium Array, Dynamic_Programming, Backtracking 5 82.32
1773 Count Items Matching a Rule Easy Array, String 3 98.33
1771 Maximize Palindrome Length From Subsequences Hard String, Dynamic_Programming 58 87.88
1770 Maximum Score from Performing Multiplication Operations Hard Array, Dynamic_Programming 31 92.41
1769 Minimum Number of Operations to Move All Balls to Each Box Medium Array, String 3 91.66
1768 Merge Strings Alternately Easy String, Two_Pointers, Programming_Skills_I_Day_8_String 1 86.26
1766 Tree of Coprimes Hard Math, Depth_First_Search, Breadth_First_Search, Tree 111 94.07
1765 Map of Highest Peak Medium Array, Breadth_First_Search, Matrix 64 85.40
1764 Form Array by Concatenating Subarrays of Another Array Medium Array, Greedy, String_Matching 3 43.69
1763 Longest Nice Substring Easy String, Hash_Table, Bit_Manipulation, Sliding_Window 5 61.88
1761 Minimum Degree of a Connected Trio in a Graph Hard Graph 33 89.17
1760 Minimum Limit of Balls in a Bag Medium Array, Binary_Search, Binary_Search_II_Day_3 44 78.49
1759 Count Number of Homogenous Substrings Medium String, Math 19 42.40
1758 Minimum Changes To Make Alternating Binary String Easy String 2 98.92
1757 Recyclable and Low Fat Products Easy Database, SQL_I_Day_1_Select 475 71.54
1755 Closest Subsequence Sum Hard Array, Dynamic_Programming, Two_Pointers, Bit_Manipulation, Bitmask 383 87.60
1754 Largest Merge Of Two Strings Medium String, Greedy, Two_Pointers 37 89.23
1753 Maximum Score From Removing Stones Medium Math, Greedy, Heap_Priority_Queue 0 100.00
1752 Check if Array Is Sorted and Rotated Easy Array 0 100.00
1751 Maximum Number of Events That Can Be Attended II Hard Array, Dynamic_Programming, Binary_Search 12 98.33
1750 Minimum Length of String After Deleting Similar Ends Medium String, Two_Pointers 5 68.68
1749 Maximum Absolute Sum of Any Subarray Medium Array, Dynamic_Programming 3 90.60
1748 Sum of Unique Elements Easy Array, Hash_Table, Counting 2 54.08
1745 Palindrome Partitioning IV Hard String, Dynamic_Programming 10 100.00
1744 Can You Eat Your Favorite Candy on Your Favorite Day? Medium Array, Prefix_Sum 5 100.00
1743 Restore the Array From Adjacent Pairs Medium Array, Hash_Table 95 99.08
1742 Maximum Number of Balls in a Box Easy Hash_Table, Math, Counting 7 98.87
1741 Find Total Time Spent by Each Employee Easy Database, SQL_I_Day_8_Function 414 93.27
1739 Building Boxes Hard Math, Greedy, Binary_Search 1 84.38
1738 Find Kth Largest XOR Coordinate Value Medium Array, Matrix, Bit_Manipulation, Heap_Priority_Queue, Prefix_Sum, Divide_and_Conquer, Quickselect 40 97.08
1737 Change Minimum Characters to Satisfy One of Three Conditions Medium String, Hash_Table, Prefix_Sum, Counting 8 87.70
1736 Latest Time by Replacing Hidden Digits Easy String, Greedy 3 35.96
1735 Count Ways to Make Array With Product Hard Array, Dynamic_Programming, Math 189 43.75
1734 Decode XORed Permutation Medium Array, Bit_Manipulation 6 34.52
1733 Minimum Number of People to Teach Medium Array, Greedy 11 98.57
1732 Find the Highest Altitude Easy Array, Prefix_Sum 0 100.00
1731 The Number of Employees Which Report to Each Employee Easy Database 1162 87.26
1729 Find Followers Count Easy Database, SQL_I_Day_7_Function 456 88.39
1728 Cat and Mouse II Hard Array, Dynamic_Programming, Math, Matrix, Graph, Memoization, Topological_Sort, Game_Theory 12 99.12
1727 Largest Submatrix With Rearrangements Medium Array, Sorting, Greedy, Matrix 9 90.48
1726 Tuple with Same Product Medium Array, Hash_Table 235 90.73
1725 Number Of Rectangles That Can Form The Largest Square Easy Array 1 100.00
1723 Find Minimum Time to Finish All Jobs Hard Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 3 76.73
1722 Minimize Hamming Distance After Swap Operations Medium Array, Depth_First_Search, Union_Find 51 94.82
1721 Swapping Nodes in a Linked List Medium Two_Pointers, Linked_List 2 100.00
1720 Decode XORed Array Easy Array, Bit_Manipulation 1 100.00
1719 Number Of Ways To Reconstruct A Tree Hard Tree, Graph, Topological_Sort 91 67.57
1718 Construct the Lexicographically Largest Valid Sequence Medium Array, Backtracking 0 100.00
1717 Maximum Score From Removing Substrings Medium String, Greedy, Stack 19 99.25
1716 Calculate Money in Leetcode Bank Easy Math 1 65.33
1713 Minimum Operations to Make a Subsequence Hard Array, Hash_Table, Greedy, Binary_Search 81 95.39
1712 Ways to Split Array Into Three Subarrays Medium Array, Binary_Search, Two_Pointers, Prefix_Sum, Binary_Search_II_Day_10 16 84.24
1711 Count Good Meals Medium Array, Hash_Table 75 93.77
1710 Maximum Units on a Truck Easy Array, Sorting, Greedy 9 78.69
1707 Maximum XOR With an Element From Array Hard Array, Bit_Manipulation, Trie 150 97.24
1706 Where Will the Ball Fall Medium Array, Dynamic_Programming, Depth_First_Search, Matrix, Simulation, Level_2_Day_1_Implementation/Simulation 2 64.55
1705 Maximum Number of Eaten Apples Medium Array, Greedy, Heap_Priority_Queue 53 77.63
1704 Determine if String Halves Are Alike Easy String, Counting 1 100.00
1703 Minimum Adjacent Swaps for K Consecutive Ones Hard Array, Greedy, Prefix_Sum, Sliding_Window 10 96.25
1702 Maximum Binary String After Change Medium String, Greedy 42 82.86
1701 Average Waiting Time Medium Array, Simulation 2 100.00
1700 Number of Students Unable to Eat Lunch Easy Array, Stack, Simulation, Queue 2 63.14
1697 Checking Existence of Edge Length Limited Paths Hard Array, Sorting, Graph, Union_Find 94 90.48
1696 Jump Game VI Medium Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 23 86.05
1695 Maximum Erasure Value Medium Array, Hash_Table, Sliding_Window 5 99.82
1694 Reformat Phone Number Easy String 1 99.67
1693 Daily Leads and Partners Easy Database, SQL_I_Day_7_Function 463 78.98
1691 Maximum Height by Stacking Cuboids Hard Array, Dynamic_Programming, Sorting 6 83.07
1690 Stone Game VII Medium Array, Dynamic_Programming, Math, Game_Theory 18 96.71
1689 Partitioning Into Minimum Number Of Deci-Binary Numbers Medium String, Greedy 5 93.98
1688 Count of Matches in Tournament Easy Math, Simulation 0 100.00
1687 Delivering Boxes from Storage to Ports Hard Array, Dynamic_Programming, Heap_Priority_Queue, Queue, Segment_Tree, Monotonic_Queue 9 91.09
1686 Stone Game VI Medium Array, Math, Sorting, Greedy, Heap_Priority_Queue, Game_Theory 139 62.50
1685 Sum of Absolute Differences in a Sorted Array Medium Array, Math, Prefix_Sum 4 80.17
1684 Count the Number of Consistent Strings Easy Array, String, Hash_Table, Bit_Manipulation 6 97.04
1683 Invalid Tweets Easy Database 1184 78.28
1681 Minimum Incompatibility Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 1 100.00
1680 Concatenation of Consecutive Binary Numbers Medium Math, Bit_Manipulation, Simulation 70 95.05
1679 Max Number of K-Sum Pairs Medium Array, Hash_Table, Sorting, Two_Pointers 20 91.22
1678 Goal Parser Interpretation Easy String, Programming_Skills_I_Day_8_String 0 100.00
1675 Minimize Deviation in Array Hard Array, Greedy, Heap_Priority_Queue, Ordered_Set 104 88.83
1674 Minimum Moves to Make Array Complementary Medium Array, Hash_Table, Prefix_Sum 12 80.39
1673 Find the Most Competitive Subsequence Medium Array, Greedy, Stack, Monotonic_Stack 7 96.82
1672 Richest Customer Wealth Easy Array, Matrix, Programming_Skills_I_Day_6_Array 0 100.00
1671 Minimum Number of Removals to Make Mountain Array Hard Array, Dynamic_Programming, Greedy, Binary_Search 19 81.23
1670 Design Front Middle Back Queue Medium Array, Design, Linked_List, Queue, Data_Stream 5 100.00
1669 Merge In Between Linked Lists Medium Linked_List 2 76.51
1668 Maximum Repeating Substring Easy String, String_Matching 1 93.15
1667 Fix Names in a Table Easy Database, SQL_I_Day_3_String_Processing_Functions 559 80.29
1665 Minimum Initial Energy to Finish Tasks Hard Array, Sorting, Greedy 30 81.16
1664 Ways to Make a Fair Array Medium Array, Dynamic_Programming 11 71.76
1663 Smallest String With A Given Numeric Value Medium String, Greedy 22 75.05
1662 Check If Two String Arrays are Equivalent Easy Array, String 0 100.00
1661 Average Time of Process per Machine Easy Database 429 79.06
1659 Maximize Grid Happiness Hard Dynamic_Programming, Bit_Manipulation, Bitmask, Memoization 95 75.00
1658 Minimum Operations to Reduce X to Zero Medium Array, Hash_Table, Binary_Search, Prefix_Sum, Sliding_Window 4 98.95
1657 Determine if Two Strings Are Close Medium String, Hash_Table, Sorting 12 97.58
1656 Design an Ordered Stream Easy Array, Hash_Table, Design, Data_Stream 95 74.07
1655 Distribute Repeating Integers Hard Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 7 94.23
1654 Minimum Jumps to Reach Home Medium Array, Dynamic_Programming, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search 6 99.87
1653 Minimum Deletions to Make String Balanced Medium String, Dynamic_Programming, Stack 26 90.44
1652 Defuse the Bomb Easy Array 0 100.00
1649 Create Sorted Array through Instructions Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 35 100.00
1648 Sell Diminishing-Valued Colored Balls Medium Array, Math, Sorting, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_19 27 80.64
1647 Minimum Deletions to Make Character Frequencies Unique Medium String, Sorting, Greedy 8 100.00
1646 Get Maximum in Generated Array Easy Array, Dynamic_Programming, Simulation 0 100.00
1643 Kth Smallest Instructions Hard Array, Dynamic_Programming, Math, Combinatorics 1 100.00
1642 Furthest Building You Can Reach Medium Array, Greedy, Heap_Priority_Queue 13 98.96
1641 Count Sorted Vowel Strings Medium Dynamic_Programming 0 100.00
1640 Check Array Formation Through Concatenation Easy Array, Hash_Table 1 87.62
1639 Number of Ways to Form a Target String Given a Dictionary Hard Array, String, Dynamic_Programming 50 95.33
1638 Count Substrings That Differ by One Character Medium String, Hash_Table, Dynamic_Programming 5 76.39
1637 Widest Vertical Area Between Two Points Containing No Points Easy Array, Sorting 17 74.19
1636 Sort Array by Increasing Frequency Easy Array, Hash_Table, Sorting 7 75.30
1633 Percentage of Users Attended a Contest Easy Database 1550 95.68
1632 Rank Transform of a Matrix Hard Array, Greedy, Matrix, Graph, Union_Find, Topological_Sort 65 100.00
1631 Path With Minimum Effort Medium Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find 75 60.52
1630 Arithmetic Subarrays Medium Array, Sorting, Programming_Skills_II_Day_9 8 93.62
1629 Slowest Key Easy Array, String 1 94.07
1627 Graph Connectivity With Threshold Hard Array, Math, Union_Find 7 98.45
1626 Best Team With No Conflicts Medium Array, Dynamic_Programming, Sorting 38 92.31
1625 Lexicographically Smallest String After Applying Operations Medium String, Breadth_First_Search 91 91.80
1624 Largest Substring Between Two Equal Characters Easy String, Hash_Table 1 85.13
1622 Fancy Sequence Hard Math, Design, Segment_Tree 40 96.55
1621 Number of Sets of K Non-Overlapping Line Segments Medium Dynamic_Programming, Math 16 94.74
1620 Coordinate With Maximum Network Quality Medium Array, Enumeration 58 68.75
1619 Mean of Array After Removing Some Elements Easy Array, Sorting 2 99.81
1617 Count Subtrees With Max Distance Between Cities Hard Dynamic_Programming, Tree, Bit_Manipulation, Bitmask, Enumeration 52 78.95
1616 Split Two Strings to Make Palindrome Medium String, Greedy, Two_Pointers 2 100.00
1615 Maximal Network Rank Medium Graph, Graph_Theory_I_Day_14_Graph_Theory 3 97.34
1614 Maximum Nesting Depth of the Parentheses Easy String, Stack 1 80.44
1611 Minimum One Bit Operations to Make Integers Zero Hard Dynamic_Programming, Bit_Manipulation, Memoization 1 88.24
1610 Maximum Number of Visible Points Hard Array, Math, Sorting, Sliding_Window, Geometry 122 97.44
1609 Even Odd Tree Medium Breadth_First_Search, Tree, Binary_Tree 8 98.81
1608 Special Array With X Elements Greater Than or Equal X Easy Array, Sorting, Binary_Search, Binary_Search_I_Day_7 2 61.14
1606 Find Servers That Handled Most Number of Requests Hard Array, Greedy, Heap_Priority_Queue, Ordered_Set 118 98.21
1605 Find Valid Matrix Given Row and Column Sums Medium Array, Greedy, Matrix 2 98.45
1604 Alert Using Same Key-Card Three or More Times in a One Hour Period Medium Array, String, Hash_Table, Sorting 77 95.79
1603 Design Parking System Easy Design, Simulation, Counting, Programming_Skills_I_Day_12_Class_and_Object 8 76.16
1601 Maximum Number of Achievable Transfer Requests Hard Array, Bit_Manipulation, Backtracking, Enumeration 26 84.02
1600 Throne Inheritance Medium Hash_Table, Depth_First_Search, Tree, Design 267 90.38
1599 Maximum Profit of Operating a Centennial Wheel Medium Array, Simulation 4 95.65
1598 Crawler Log Folder Easy Array, String, Stack 0 100.00
1595 Minimum Cost to Connect Two Groups of Points Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 74 64.83
1594 Maximum Non Negative Product in a Matrix Medium Array, Dynamic_Programming, Matrix 1 100.00
1593 Split a String Into the Max Number of Unique Substrings Medium String, Hash_Table, Backtracking 8 95.81
1592 Rearrange Spaces Between Words Easy String 3 67.74
1591 Strange Printer II Hard Array, Matrix, Graph, Topological_Sort 12 90.00
1590 Make Sum Divisible by P Medium Array, Hash_Table, Prefix_Sum 56 62.20
1589 Maximum Sum Obtained of Any Permutation Medium Array, Sorting, Greedy, Prefix_Sum 25 92.45
1588 Sum of All Odd Length Subarrays Easy Array, Math, Prefix_Sum, Programming_Skills_I_Day_6_Array 0 100.00
1587 Bank Account Summary II Easy Database, SQL_I_Day_10_Where 630 60.32
1585 Check If String Is Transformable With Substring Sort Operations Hard String, Sorting, Greedy 20 97.22
1584 Min Cost to Connect All Points Medium Array, Union_Find, Minimum_Spanning_Tree 134 87.37
1583 Count Unhappy Friends Medium Array, Simulation 3 93.13
1582 Special Positions in a Binary Matrix Easy Array, Matrix 2 82.12
1581 Customer Who Visited but Did Not Make Any Transactions Easy Database, SQL_I_Day_5_Union 1039 76.99
1579 Remove Max Number of Edges to Keep Graph Fully Traversable Hard Graph, Union_Find 30 66.23
1578 Minimum Time to Make Rope Colorful Medium Array, String, Dynamic_Programming, Greedy 4 100.00
1577 Number of Ways Where Square of Number Is Equal to Product of Two Numbers Medium Array, Hash_Table, Math, Two_Pointers 20 86.27
1576 Replace All ?’s to Avoid Consecutive Repeating Characters Easy String 2 82.74
1575 Count All Possible Routes Hard Array, Dynamic_Programming, Memoization 111 72.26
1574 Shortest Subarray to be Removed to Make Array Sorted Medium Array, Binary_Search, Two_Pointers, Stack, Monotonic_Stack, Binary_Search_II_Day_14 2 84.97
1573 Number of Ways to Split a String Medium String, Math 9 82.09
1572 Matrix Diagonal Sum Easy Array, Matrix, Programming_Skills_I_Day_7_Array, Udemy_2D_Arrays/Matrix 0 100.00
1569 Number of Ways to Reorder Array to Get Same BST Hard Array, Dynamic_Programming, Math, Tree, Binary_Tree, Union_Find, Binary_Search_Tree, Divide_and_Conquer, Memoization, Combinatorics 21 97.44
1568 Minimum Number of Days to Disconnect Island Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Strongly_Connected_Component 1 100.00
1567 Maximum Length of Subarray With Positive Product Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_6 4 80.86
1566 Detect Pattern of Length M Repeated K or More Times Easy Array, Enumeration 1 49.25
1563 Stone Game V Hard Array, Dynamic_Programming, Math, Game_Theory 36 95.56
1562 Find Latest Group of Size M Medium Array, Binary_Search, Simulation, Binary_Search_II_Day_19 8 90.00
1561 Maximum Number of Coins You Can Get Medium Array, Math, Sorting, Greedy, Game_Theory 34 69.29
1560 Most Visited Sector in a Circular Track Easy Array, Simulation 1 88.89
1559 Detect Cycles in 2D Grid Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 22 82.51
1558 Minimum Numbers of Function Calls to Make Target Array Medium Array, Greedy 42 69.17
1557 Minimum Number of Vertices to Reach All Nodes Medium Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory 8 99.94
1556 Thousand Separator Easy String 1 57.92
1553 Minimum Number of Days to Eat N Oranges Hard Dynamic_Programming, Memoization 5 91.90
1552 Magnetic Force Between Two Balls Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_4 39 99.65
1551 Minimum Operations to Make Array Equal Medium Math 0 100.00
1550 Three Consecutive Odds Easy Array 0 100.00
1547 Minimum Cost to Cut a Stick Hard Array, Dynamic_Programming 6 100.00
1546 Maximum Number of Non-Overlapping Subarrays With Sum Equals Target Medium Array, Hash_Table, Greedy, Prefix_Sum 56 71.58
1545 Find Kth Bit in Nth Binary String Medium String, Recursion 0 100.00
1544 Make The String Great Easy String, Stack 6 50.00
1542 Find Longest Awesome Substring Hard String, Hash_Table, Bit_Manipulation 12 84.16
1541 Minimum Insertions to Balance a Parentheses String Medium String, Greedy, Stack 12 85.50
1540 Can Convert String in K Moves Medium String, Hash_Table 10 100.00
1539 Kth Missing Positive Number Easy Array, Binary_Search, Binary_Search_I_Day_6 0 100.00
1537 Get the Maximum Score Hard Array, Dynamic_Programming, Greedy, Two_Pointers 6 58.14
1536 Minimum Swaps to Arrange a Binary Grid Medium Array, Greedy, Matrix 1 100.00
1535 Find the Winner of an Array Game Medium Array, Simulation 1 86.99
1534 Count Good Triplets Easy Array, Enumeration 14 82.96
1531 String Compression II Hard String, Dynamic_Programming 34 83.91
1530 Number of Good Leaf Nodes Pairs Medium Depth_First_Search, Tree, Binary_Tree 3 94.18
1529 Minimum Suffix Flips Medium String, Greedy 6 89.67
1528 Shuffle String Easy Array, String 2 54.77
1527 Patients With a Condition Easy Database, SQL_I_Day_3_String_Processing_Functions 308 66.93
1526 Minimum Number of Increments on Subarrays to Form a Target Array Hard Array, Dynamic_Programming, Greedy, Stack, Monotonic_Stack 4 70.36
1525 Number of Good Ways to Split a String Medium String, Dynamic_Programming, Bit_Manipulation 19 69.66
1524 Number of Sub-arrays With Odd Sum Medium Array, Dynamic_Programming, Math, Prefix_Sum 9 90.24
1523 Count Odd Numbers in an Interval Range Easy Math, Programming_Skills_I_Day_1_Basic_Data_Type 0 100.00
1521 Find a Value of a Mysterious Function Closest to Target Hard Array, Binary_Search, Bit_Manipulation, Segment_Tree 9 100.00
1520 Maximum Number of Non-Overlapping Substrings Hard String, Greedy 15 92.93
1519 Number of Nodes in the Sub-Tree With the Same Label Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Counting 60 98.13
1518 Water Bottles Easy Math, Simulation 0 100.00
1517 Find Users With Valid E-Mails Easy Database 1356 75.95
1515 Best Position for a Service Centre Hard Math, Geometry, Randomized 6 87.14
1514 Path with Maximum Probability Medium Heap_Priority_Queue, Graph, Shortest_Path 31 93.10
1513 Number of Substrings With Only 1s Medium String, Math 3 97.83
1512 Number of Good Pairs Easy Array, Hash_Table, Math, Counting 1 84.97
1510 Stone Game IV Hard Dynamic_Programming, Math, Game_Theory 12 85.75
1509 Minimum Difference Between Largest and Smallest Value in Three Moves Medium Array, Sorting, Greedy 19 76.94
1508 Range Sum of Sorted Subarray Sums Medium Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_14 60 93.84
1507 Reformat Date Easy String 1 98.73
1505 Minimum Possible Integer After at Most K Adjacent Swaps On Digits Hard String, Greedy, Segment_Tree, Binary_Indexed_Tree 12 96.77
1504 Count Submatrices With All Ones Medium Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack 9 85.86
1503 Last Moment Before All Ants Fall Out of a Plank Medium Array, Simulation, Brainteaser 1 81.72
1502 Can Make Arithmetic Progression From Sequence Easy Array, Sorting, Programming_Skills_I_Day_4_Loop 2 90.55
1499 Max Value of Equation Hard Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 7 98.61
1498 Number of Subsequences That Satisfy the Given Sum Condition Medium Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_II_Day_15 27 99.13
1497 Check If Array Pairs Are Divisible by k Medium Array, Hash_Table, Counting 7 97.44
1496 Path Crossing Easy String, Hash_Table 1 97.41
1494 Parallel Courses II Hard Dynamic_Programming, Bit_Manipulation, Graph, Bitmask 325 42.24
1493 Longest Subarray of 1’s After Deleting One Element Medium Dynamic_Programming, Math, Sliding_Window 2 87.25
1492 The kth Factor of n Medium Math 1 83.94
1491 Average Salary Excluding the Minimum and Maximum Salary Easy Array, Sorting, Programming_Skills_I_Day_1_Basic_Data_Type 0 100.00
1489 Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree Hard Sorting, Graph, Union_Find, Minimum_Spanning_Tree, Strongly_Connected_Component 17 100.00
1488 Avoid Flood in The City Medium Array, Hash_Table, Greedy, Binary_Search, Heap_Priority_Queue, Binary_Search_II_Day_18 82 75.08
1487 Making File Names Unique Medium Array, String, Hash_Table 36 98.46
1486 XOR Operation in an Array Easy Math, Bit_Manipulation 0 100.00
1484 Group Sold Products By The Date Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_3_String_Processing_Functions 395 77.20
1483 Kth Ancestor of a Tree Node Hard Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Tree, Binary_Search, Design 60 93.28
1482 Minimum Number of Days to Make m Bouquets Medium Array, Binary_Search, Binary_Search_II_Day_7 25 69.18
1481 Least Number of Unique Integers after K Removals Medium Array, Hash_Table, Sorting, Greedy, Counting 62 85.33
1480 Running Sum of 1d Array Easy Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum 0 100.00
1478 Allocate Mailboxes Hard Array, Dynamic_Programming, Math, Sorting 12 78.87
1477 Find Two Non-overlapping Sub-arrays Each With Target Sum Medium Array, Hash_Table, Dynamic_Programming, Binary_Search, Sliding_Window 8 89.43
1476 Subrectangle Queries Medium Array, Matrix, Design 20 97.61
1475 Final Prices With a Special Discount in a Shop Easy Array, Stack, Monotonic_Stack 2 80.33
1473 Paint House III Hard Array, Dynamic_Programming 26 89.13
1472 Design Browser History Medium Array, Stack, Design, Linked_List, Data_Stream, Doubly_Linked_List 76 82.33
1471 The k Strongest Values in an Array Medium Array, Sorting, Two_Pointers 37 88.20
1470 Shuffle the Array Easy Array 1 51.62
1467 Probability of a Two Boxes Having The Same Number of Distinct Balls Hard Dynamic_Programming, Math, Backtracking, Combinatorics, Probability_and_Statistics 1 100.00
1466 Reorder Routes to Make All Paths Lead to the City Zero Medium Depth_First_Search, Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal 39 97.71
1465 Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts Medium Array, Sorting, Greedy 21 35.40
1464 Maximum Product of Two Elements in an Array Easy Array, Sorting, Heap_Priority_Queue 1 90.39
1463 Cherry Pickup II Hard Array, Dynamic_Programming, Matrix 10 99.58
1462 Course Schedule IV Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 10 100.00
1461 Check If a String Contains All Binary Codes of Size K Medium String, Hash_Table, Bit_Manipulation, Hash_Function, Rolling_Hash 169 52.07
1460 Make Two Arrays Equal by Reversing Sub-arrays Easy Array, Hash_Table, Sorting 4 74.61
1458 Max Dot Product of Two Subsequences Hard Array, Dynamic_Programming 6 98.36
1457 Pseudo-Palindromic Paths in a Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Bit_Manipulation 35 43.73
1456 Maximum Number of Vowels in a Substring of Given Length Medium String, Sliding_Window 19 53.73
1455 Check If a Word Occurs As a Prefix of Any Word in a Sentence Easy String, String_Matching 1 32.08
1453 Maximum Number of Darts Inside of a Circular Dartboard Hard Array, Math, Geometry 22 100.00
1452 People Whose List of Favorite Companies Is Not a Subset of Another List Medium Array, String, Hash_Table 117 78.71
1451 Rearrange Words in a Sentence Medium String, Sorting 21 89.94
1450 Number of Students Doing Homework at a Given Time Easy Array 0 100.00
1449 Form Largest Integer With Digits That Add up to Target Hard Array, Dynamic_Programming 8 77.46
1448 Count Good Nodes in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 99.63
1447 Simplified Fractions Medium String, Math, Number_Theory 33 69.60
1446 Consecutive Characters Easy String 3 30.50
1444 Number of Ways of Cutting a Pizza Hard Array, Dynamic_Programming, Matrix, Memoization 14 46.03
1443 Minimum Time to Collect All Apples in a Tree Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree 75 57.75
1442 Count Triplets That Can Form Two Arrays of Equal XOR Medium Array, Hash_Table, Math, Bit_Manipulation, Prefix_Sum 2 79.80
1441 Build an Array With Stack Operations Medium Array, Stack, Simulation 1 38.47
1439 Find the Kth Smallest Sum of a Matrix With Sorted Rows Hard Array, Binary_Search, Matrix, Heap_Priority_Queue 40 75.79
1438 Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit Medium Array, Heap_Priority_Queue, Sliding_Window, Ordered_Set, Queue, Monotonic_Queue 38 81.86
1437 Check If All 1’s Are at Least Length K Places Away Easy Array 2 73.75
1436 Destination City Easy String, Hash_Table 3 81.47
1434 Number of Ways to Wear Different Hats to Each Other Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 31 77.92
1433 Check If a String Can Break Another String Medium String, Sorting, Greedy 9 77.89
1432 Max Difference You Can Get From Changing an Integer Medium Math, Greedy 1 97.22
1431 Kids With the Greatest Number of Candies Easy Array 1 84.43
1425 Constrained Subsequence Sum Hard Array, Dynamic_Programming, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue 69 30.52
1424 Diagonal Traverse II Medium Array, Sorting, Heap_Priority_Queue 39 85.56
1423 Maximum Points You Can Obtain from Cards Medium Array, Prefix_Sum, Sliding_Window 2 94.06
1422 Maximum Score After Splitting a String Easy String 1 96.45
1420 Build Array Where You Can Find The Maximum Exactly K Comparisons Hard Dynamic_Programming 22 86.32
1419 Minimum Number of Frogs Croaking Medium String, Counting 19 32.16
1418 Display Table of Food Orders in a Restaurant Medium Array, String, Hash_Table, Sorting, Ordered_Set 42 77.01
1417 Reformat The String Easy String 10 62.27
1416 Restore The Array Hard String, Dynamic_Programming 34 100.00
1415 The k-th Lexicographical String of All Happy Strings of Length n Medium String, Backtracking 2 90.55
1414 Find the Minimum Number of Fibonacci Numbers Whose Sum Is K Medium Greedy 2 67.22
1413 Minimum Value to Get Positive Step by Step Sum Easy Array, Prefix_Sum 0 100.00
1411 Number of Ways to Paint N × 3 Grid Hard Dynamic_Programming 14 34.91
1410 HTML Entity Parser Medium String, Hash_Table 19 98.92
1409 Queries on a Permutation With Key Medium Array, Simulation, Binary_Indexed_Tree 15 38.43
1408 String Matching in an Array Easy String, String_Matching 8 24.88
1407 Top Travellers Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_9_Control_of_Flow 682 70.16
1406 Stone Game III Hard Array, Dynamic_Programming, Math, Game_Theory 14 82.02
1405 Longest Happy String Medium String, Greedy, Heap_Priority_Queue 0 100.00
1404 Number of Steps to Reduce a Number in Binary Representation to One Medium String, Bit_Manipulation 1 62.90
1403 Minimum Subsequence in Non-Increasing Order Easy Array, Sorting, Greedy 4 79.60
1402 Reducing Dishes Hard Array, Dynamic_Programming, Sorting, Greedy 3 66.20
1401 Circle and Rectangle Overlapping Medium Math, Geometry 0 100.00
1400 Construct K Palindrome Strings Medium String, Hash_Table, Greedy, Counting 5 94.62
1399 Count Largest Group Easy Hash_Table, Math 3 98.21
1397 Find All Good Strings Hard String, Dynamic_Programming, String_Matching 85 41.25
1396 Design Underground System Medium String, Hash_Table, Design 89 89.64
1395 Count Number of Teams Medium Array, Dynamic_Programming, Binary_Indexed_Tree 18 91.75
1394 Find Lucky Integer in an Array Easy Array, Hash_Table, Counting 2 82.56
1393 Capital Gain/Loss Medium LeetCode_Curated_SQL_70, Database, SQL_I_Day_9_Control_of_Flow 428 92.01
1392 Longest Happy Prefix Hard String, Hash_Function, String_Matching, Rolling_Hash 39 28.37
1391 Check if There is a Valid Path in a Grid Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 14 85.37
1390 Four Divisors Medium Array, Math 13 97.25
1389 Create Target Array in the Given Order Easy Array, Simulation 0 100.00
1388 Pizza With 3n Slices Hard Array, Dynamic_Programming, Greedy, Heap_Priority_Queue 5 93.33
1387 Sort Integers by The Power Value Medium Dynamic_Programming, Sorting, Memoization 52 87.20
1386 Cinema Seat Allocation Medium Array, Hash_Table, Greedy, Bit_Manipulation 32 69.41
1385 Find the Distance Value Between Two Arrays Easy Array, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_3 5 65.78
1383 Maximum Performance of a Team Hard Array, Sorting, Greedy, Heap_Priority_Queue 66 66.03
1382 Balance a Binary Search Tree Medium Depth_First_Search, Greedy, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer 5 65.24
1381 Design a Stack With Increment Operation Medium Array, Stack, Design 8 62.23
1380 Lucky Numbers in a Matrix Easy Array, Matrix 2 82.40
1379 Find a Corresponding Node of a Binary Tree in a Clone of That Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 77.89
1378 Replace Employee ID With The Unique Identifier Easy Database 2498 63.60
1377 Frog Position After T Seconds Hard Depth_First_Search, Breadth_First_Search, Tree, Graph 6 81.30
1376 Time Needed to Inform All Employees Medium Depth_First_Search, Breadth_First_Search, Tree, Programming_Skills_II_Day_11, Graph_Theory_I_Day_9_Standard_Traversal 8 99.85
1375 Number of Times Binary String Is Prefix-Aligned Medium Array 2 89.02
1374 Generate a String With Characters That Have Odd Counts Easy String 1 90.52
1373 Maximum Sum BST in Binary Tree Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 15 47.56
1372 Longest ZigZag Path in a Binary Tree Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree 9 64.47
1371 Find the Longest Substring Containing Vowels in Even Counts Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 25 80.38
1370 Increasing Decreasing String Easy String, Hash_Table, Counting 4 80.41
1368 Minimum Cost to Make at Least One Valid Path in a Grid Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue, Graph, Shortest_Path 8 99.38
1367 Linked List in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Programming_Skills_II_Day_4 2 61.23
1366 Rank Teams by Votes Medium Array, String, Hash_Table, Sorting, Counting 5 95.68
1365 How Many Numbers Are Smaller Than the Current Number Easy Array, Hash_Table, Sorting, Counting 1 99.78
1363 Largest Multiple of Three Hard Array, Dynamic_Programming, Greedy 5 84.67
1362 Closest Divisors Medium Math 8 84.91
1361 Validate Binary Tree Nodes Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Graph, Union_Find 8 69.78
1360 Number of Days Between Two Dates Easy String, Math 2 78.82
1359 Count All Valid Pickup and Delivery Options Hard Dynamic_Programming, Math, Combinatorics 0 100.00
1358 Number of Substrings Containing All Three Characters Medium String, Hash_Table, Sliding_Window 15 53.82
1357 Apply Discount Every n Orders Medium Array, Hash_Table, Design 174 58.82
1356 Sort Integers by The Number of 1 Bits Easy Array, Sorting, Bit_Manipulation, Counting, Programming_Skills_I_Day_11_Containers_and_Libraries 10 65.50
1354 Construct Target Array With Multiple Sums Hard Array, Heap_Priority_Queue 2 100.00
1353 Maximum Number of Events That Can Be Attended Medium Array, Greedy, Heap_Priority_Queue 53 99.53
1352 Product of the Last K Numbers Medium Array, Math, Design, Queue, Data_Stream 24 60.43
1351 Count Negative Numbers in a Sorted Matrix Easy Array, Binary_Search, Matrix, Binary_Search_I_Day_8 1 49.66
1349 Maximum Students Taking Exam Hard Array, Dynamic_Programming, Matrix, Bit_Manipulation, Bitmask 4 76.98
1348 Tweet Counts Per Frequency Medium Hash_Table, Sorting, Binary_Search, Design, Ordered_Set 86 99.44
1347 Minimum Number of Steps to Make Two Strings Anagram Medium String, Hash_Table, Counting 13 76.34
1346 Check If N and Its Double Exist Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Binary_Search_I_Day_9 1 99.64
1345 Jump Game IV Hard Array, Hash_Table, Breadth_First_Search 65 89.91
1344 Angle Between Hands of a Clock Medium Math 0 100.00
1343 Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold Medium Array, Sliding_Window 5 46.57
1342 Number of Steps to Reduce a Number to Zero Easy Math, Bit_Manipulation 1 58.49
1341 Movie Rating Medium Database 2515 78.94
1340 Jump Game V Hard Array, Dynamic_Programming, Sorting 13 71.33
1339 Maximum Product of Splitted Binary Tree Medium Depth_First_Search, Tree, Binary_Tree 11 83.43
1338 Reduce Array Size to The Half Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue 61 73.82
1337 The K Weakest Rows in a Matrix Easy Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue, Binary_Search_I_Day_9 1 99.77
1335 Minimum Difficulty of a Job Schedule Hard Array, Dynamic_Programming 11 79.28
1334 Find the City With the Smallest Number of Neighbors at a Threshold Distance Medium Dynamic_Programming, Graph, Shortest_Path 21 49.75
1333 Filter Restaurants by Vegan-Friendly, Price and Distance Medium Array, Sorting 10 55.43
1332 Remove Palindromic Subsequences Easy String, Two_Pointers 0 100.00
1331 Rank Transform of an Array Easy Array, Hash_Table, Sorting 22 98.50
1330 Reverse Subarray To Maximize Array Value Hard Array, Math, Greedy 9 88.00
1329 Sort the Matrix Diagonally Medium Array, Sorting, Matrix 15 26.03
1328 Break a Palindrome Medium String, Greedy 0 100.00
1327 List the Products Ordered in a Period Easy Database 1374 80.18
1326 Minimum Number of Taps to Open to Water a Garden Hard Array, Dynamic_Programming, Greedy 3 90.04
1325 Delete Leaves With a Given Value Medium Depth_First_Search, Tree, Binary_Tree 2 33.61
1324 Print Words Vertically Medium Array, String, Simulation 1 90.59
1323 Maximum 69 Number Easy Math, Greedy 3 32.03
1321 Restaurant Growth Medium Database 775 61.73
1320 Minimum Distance to Type a Word Using Two Fingers Hard String, Dynamic_Programming 16 82.29
1319 Number of Operations to Make Network Connected Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_8_Standard_Traversal 9 67.64
1318 Minimum Flips to Make a OR b Equal to c Medium Bit_Manipulation 0 100.00
1317 Convert Integer to the Sum of Two No-Zero Integers Easy Math 1 84.36
1316 Distinct Echo Substrings Hard String, Dynamic_Programming, Sliding_Window, Trie, Hash_Function, Rolling_Hash 165 93.15
1315 Sum of Nodes with Even-Valued Grandparent Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 78.61
1314 Matrix Block Sum Medium Array, Matrix, Prefix_Sum, Dynamic_Programming_I_Day_14 5 67.46
1313 Decompress Run-Length Encoded List Easy Array 1 98.11
1312 Minimum Insertion Steps to Make a String Palindrome Hard String, Dynamic_Programming 25 85.70
1311 Get Watched Videos by Your Friends Medium Array, Hash_Table, Sorting, Breadth_First_Search 39 73.81
1310 XOR Queries of a Subarray Medium Array, Bit_Manipulation, Prefix_Sum 3 68.91
1309 Decrypt String from Alphabet to Integer Mapping Easy String, Programming_Skills_I_Day_9_String 6 28.25
1307 Verbal Arithmetic Puzzle Hard Array, String, Math, Backtracking 6 95.74
1306 Jump Game III Medium Array, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search, Udemy_Arrays 2 96.23
1305 All Elements in Two Binary Search Trees Medium Sorting, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 25 63.82
1304 Find N Unique Integers Sum up to Zero Easy Array, Math 0 100.00
1302 Deepest Leaves Sum Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 5 59.50
1301 Number of Paths with Max Score Hard Array, Dynamic_Programming, Matrix 14 72.31
1300 Sum of Mutated Array Closest to Target Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_16 7 33.33
1299 Replace Elements with Greatest Element on Right Side Easy Array 1 99.82
1298 Maximum Candies You Can Get from Boxes Hard Array, Breadth_First_Search 3 100.00
1297 Maximum Number of Occurrences of a Substring Medium String, Hash_Table, Sliding_Window 42 90.85
1296 Divide Array in Sets of K Consecutive Numbers Medium Array, Hash_Table, Sorting, Greedy 39 97.80
1295 Find Numbers with Even Number of Digits Easy Array 2 58.23
1293 Shortest Path in a Grid with Obstacles Elimination Hard Array, Breadth_First_Search, Matrix 35 63.17
1292 Maximum Side Length of a Square with Sum Less than or Equal to Threshold Medium Array, Binary_Search, Matrix, Prefix_Sum, Binary_Search_II_Day_15 23 32.97
1291 Sequential Digits Medium Enumeration, Udemy_Arrays 0 100.00
1290 Convert Binary Number in a Linked List to Integer Easy Math, Linked_List, Programming_Skills_I_Day_10_Linked_List_and_Tree 0 100.00
1289 Minimum Falling Path Sum II Hard Array, Dynamic_Programming, Matrix 2 99.45
1288 Remove Covered Intervals Medium Array, Sorting 6 78.87
1287 Element Appearing More Than 25% In Sorted Array Easy Array 0 100.00
1286 Iterator for Combination Medium String, Design, Backtracking, Iterator 10 95.00
1284 Minimum Number of Flips to Convert Binary Matrix to Zero Matrix Hard Array, Breadth_First_Search, Matrix, Bit_Manipulation 2 89.29
1283 Find the Smallest Divisor Given a Threshold Medium Array, Binary_Search, Binary_Search_II_Day_5 9 95.49
1282 Group the People Given the Group Size They Belong To Medium Array, Hash_Table 6 79.04
1281 Subtract the Product and Sum of Digits of an Integer Easy Math, Programming_Skills_I_Day_2_Operator 0 100.00
1280 Students and Examinations Easy Database 1735 83.69
1278 Palindrome Partitioning III Hard String, Dynamic_Programming 4 89.93
1277 Count Square Submatrices with All Ones Medium Array, Dynamic_Programming, Matrix 5 95.33
1276 Number of Burgers with No Waste of Ingredients Medium Math 2 87.88
1275 Find Winner on a Tic Tac Toe Game Easy Array, Hash_Table, Matrix, Simulation 0 100.00
1269 Number of Ways to Stay in the Same Place After Some Steps Hard Dynamic_Programming 12 89.11
1268 Search Suggestions System Medium Array, String 28 78.06
1267 Count Servers that Communicate Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Counting, Union_Find 5 41.00
1266 Minimum Time Visiting All Points Easy Array, Math, Geometry 1 80.97
1263 Minimum Moves to Move a Box to Their Target Location Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 16 76.00
1262 Greatest Sum Divisible by Three Medium Array, Dynamic_Programming, Greedy 5 95.82
1261 Find Elements in a Contaminated Binary Tree Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design 24 84.00
1260 Shift 2D Grid Easy Array, Matrix, Simulation 6 89.10
1255 Maximum Score Words Formed by Letters Hard Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 1 98.36
1254 Number of Closed Islands Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_2_Matrix_Related_Problems 3 55.59
1253 Reconstruct a 2-Row Binary Matrix Medium Array, Greedy, Matrix 18 57.27
1252 Cells with Odd Values in a Matrix Easy Array, Math, Simulation 1 87.47
1251 Average Selling Price Easy Database 1413 86.28
1250 Check If It Is a Good Array Hard Array, Math, Number_Theory 4 58.82
1249 Minimum Remove to Make Valid Parentheses Medium String, Stack, Data_Structure_II_Day_14_Stack_Queue 13 94.62
1248 Count Number of Nice Subarrays Medium Array, Hash_Table, Math, Sliding_Window 14 69.78
1247 Minimum Swaps to Make Strings Equal Medium String, Math, Greedy 1 79.83
1240 Tiling a Rectangle with the Fewest Squares Hard Dynamic_Programming, Backtracking 3 62.18
1239 Maximum Length of a Concatenated String with Unique Characters Medium Array, String, Bit_Manipulation, Backtracking 9 88.28
1238 Circular Permutation in Binary Representation Medium Math, Bit_Manipulation, Backtracking 4 100.00
1237 Find Positive Integer Solution for a Given Equation Medium Math, Binary_Search, Two_Pointers, Interactive 2 79.60
1235 Maximum Profit in Job Scheduling Hard Array, Dynamic_Programming, Sorting, Binary_Search 27 89.19
1234 Replace the Substring for Balanced String Medium String, Sliding_Window 7 89.84
1233 Remove Sub-Folders from the Filesystem Medium Array, String, Trie 32 96.54
1232 Check If It Is a Straight Line Easy Array, Math, Geometry, Programming_Skills_I_Day_5_Function 0 100.00
1227 Airplane Seat Assignment Probability Medium Dynamic_Programming, Math, Brainteaser, Probability_and_Statistics 1 15.63
1226 The Dining Philosophers Medium Concurrency 10 83.56
1224 Maximum Equal Frequency Hard Array, Hash_Table 17 93.59
1223 Dice Roll Simulation Hard Array, Dynamic_Programming 9 90.98
1222 Queens That Can Attack the King Medium Array, Matrix, Simulation 1 89.88
1221 Split a String in Balanced Strings Easy String, Greedy, Counting 1 53.71
1220 Count Vowels Permutation Hard Dynamic_Programming 7 98.50
1219 Path with Maximum Gold Medium Array, Matrix, Backtracking 48 57.00
1218 Longest Arithmetic Subsequence of Given Difference Medium Array, Hash_Table, Dynamic_Programming 11 98.23
1217 Minimum Cost to Move Chips to The Same Position Easy Array, Math, Greedy 0 100.00
1211 Queries Quality and Percentage Easy Database 1230 82.08
1210 Minimum Moves to Reach Target with Rotations Hard Array, Breadth_First_Search, Matrix 29 78.57
1209 Remove All Adjacent Duplicates in String II Medium String, Stack 15 88.34
1208 Get Equal Substrings Within Budget Medium String, Binary_Search, Prefix_Sum, Sliding_Window 7 73.41
1207 Unique Number of Occurrences Easy Array, Hash_Table 2 82.71
1206 Design Skiplist Hard Design, Linked_List 14 96.71
1204 Last Person to Fit in the Bus Medium Database 1581 84.10
1203 Sort Items by Groups Respecting Dependencies Hard Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 44 88.89
1202 Smallest String With Swaps Medium String, Hash_Table, Depth_First_Search, Breadth_First_Search, Union_Find 43 86.82
1201 Ugly Number III Medium Math, Binary_Search, Number_Theory, Binary_Search_II_Day_20 0 100.00
1200 Minimum Absolute Difference Easy Array, Sorting 14 98.30
1195 Fizz Buzz Multithreaded Medium Concurrency 8 80.09
1193 Monthly Transactions I Medium Database 961 88.29
1192 Critical Connections in a Network Hard Depth_First_Search, Graph, Biconnected_Component 127 89.39
1191 K-Concatenation Maximum Sum Medium Array, Dynamic_Programming 6 73.85
1190 Reverse Substrings Between Each Pair of Parentheses Medium String, Stack 1 98.26
1189 Maximum Number of Balloons Easy String, Hash_Table, Counting 3 68.13
1187 Make Array Strictly Increasing Hard Array, Dynamic_Programming, Binary_Search 33 95.51
1186 Maximum Subarray Sum with One Deletion Medium Array, Dynamic_Programming 3 94.48
1185 Day of the Week Easy Math 0 100.00
1184 Distance Between Bus Stops Easy Array 0 100.00
1179 Reformat Department Table Easy Database 493 64.80
1178 Number of Valid Words for Each Puzzle Hard Array, String, Hash_Table, Bit_Manipulation, Trie 139 48.41
1177 Can Make Palindrome from Substring Medium String, Hash_Table, Bit_Manipulation, Prefix_Sum 13 93.08
1175 Prime Arrangements Easy Math 0 100.00
1174 Immediate Food Delivery II Medium Database 1205 78.39
1172 Dinner Plate Stacks Hard Hash_Table, Stack, Design, Heap_Priority_Queue 63 96.74
1171 Remove Zero Sum Consecutive Nodes from Linked List Medium Hash_Table, Linked_List 2 90.39
1170 Compare Strings by Frequency of the Smallest Character Medium Array, String, Hash_Table, Sorting, Binary_Search 7 57.89
1169 Invalid Transactions Medium Array, String, Hash_Table, Sorting 9 98.31
1164 Product Price at a Given Date Medium Database 920 76.39
1163 Last Substring in Lexicographical Order Hard String, Two_Pointers 10 97.22
1162 As Far from Land as Possible Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems 16 62.40
1161 Maximum Level Sum of a Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 7 97.19
1160 Find Words That Can Be Formed by Characters Easy Array, String, Hash_Table 31 42.06
1158 Market Analysis I Medium Database, SQL_I_Day_9_Control_of_Flow 2511 78.92
1157 Online Majority Element In Subarray Hard Array, Binary_Search, Design, Segment_Tree, Binary_Indexed_Tree 108 95.24
1156 Swap For Longest Repeated Character Substring Medium String, Sliding_Window 14 43.18
1155 Number of Dice Rolls With Target Sum Medium Dynamic_Programming 15 84.85
1154 Day of the Year Easy String, Math 15 31.55
1148 Article Views I Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_5_Union 783 64.09
1147 Longest Chunked Palindrome Decomposition Hard String, Dynamic_Programming, Greedy, Two_Pointers, Hash_Function, Rolling_Hash 2 60.00
1146 Snapshot Array Medium Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_18 68 45.86
1145 Binary Tree Coloring Game Medium Depth_First_Search, Tree, Binary_Tree 0 100.00
1144 Decrease Elements To Make Array Zigzag Medium Array, Greedy 0 100.00
1143 Longest Common Subsequence Medium Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m) 19 89.05
1141 User Activity for the Past 30 Days I Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_7_Function 849 72.54
1140 Stone Game II Medium Array, Dynamic_Programming, Math, Game_Theory 9 43.08
1139 Largest 1-Bordered Square Medium Array, Dynamic_Programming, Matrix 4 88.04
1138 Alphabet Board Path Medium String, Hash_Table 1 48.92
1137 N-th Tribonacci Number Easy Dynamic_Programming, Math, Memoization, Dynamic_Programming_I_Day_1 0 100.00
1131 Maximum of Absolute Value Expression Medium Array, Math 1 100.00
1130 Minimum Cost Tree From Leaf Values Medium Dynamic_Programming, Greedy, Stack, Monotonic_Stack 1 98.05
1129 Shortest Path with Alternating Colors Medium Breadth_First_Search, Graph, Graph_Theory_I_Day_10_Standard_Traversal 4 96.63
1128 Number of Equivalent Domino Pairs Easy Array, Hash_Table, Counting 15 51.49
1125 Smallest Sufficient Team Hard Array, Dynamic_Programming, Bit_Manipulation, Bitmask 3 98.50
1124 Longest Well-Performing Interval Medium Array, Hash_Table, Stack, Prefix_Sum, Monotonic_Stack 13 59.62
1123 Lowest Common Ancestor of Deepest Leaves Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00
1122 Relative Sort Array Easy Array, Hash_Table, Sorting, Counting_Sort 0 100.00
1117 Building H2O Medium Concurrency 19 89.19
1116 Print Zero Even Odd Medium Concurrency 7 38.76
1115 Print FooBar Alternately Medium Concurrency 24 38.82
1114 Print in Order Easy Concurrency 12 58.10
1111 Maximum Nesting Depth of Two Valid Parentheses Strings Medium String, Stack 1 100.00
1110 Delete Nodes And Return Forest Medium Depth_First_Search, Tree, Binary_Tree 1 98.05
1109 Corporate Flight Bookings Medium Array, Prefix_Sum 2 100.00
1108 Defanging an IP Address Easy String 0 100.00
1106 Parsing A Boolean Expression Hard String, Stack, Recursion 6 78.72
1105 Filling Bookcase Shelves Medium Array, Dynamic_Programming 0 100.00
1104 Path In Zigzag Labelled Binary Tree Medium Math, Tree, Binary_Tree 0 100.00
1103 Distribute Candies to People Easy Math, Simulation 1 97.48
1096 Brace Expansion II Hard String, Breadth_First_Search, Stack, Backtracking 23 60.36
1095 Find in Mountain Array Hard Array, Binary_Search, Interactive 0 100.00
1094 Car Pooling Medium Array, Sorting, Heap_Priority_Queue, Simulation, Prefix_Sum 1 99.38
1093 Statistics from a Large Sample Medium Math, Two_Pointers, Probability_and_Statistics 1 86.00
1092 Shortest Common Supersequence Hard String, Dynamic_Programming 10 96.12
1091 Shortest Path in Binary Matrix Medium Array, Breadth_First_Search, Matrix, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems 22 69.99
1090 Largest Values From Labels Medium Array, Hash_Table, Sorting, Greedy, Counting 14 95.96
1089 Duplicate Zeros Easy Array, Two_Pointers 2 67.91
1084 Sales Analysis III Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where 1066 69.71
1081 Smallest Subsequence of Distinct Characters Medium String, Greedy, Stack, Monotonic_Stack 2 97.16
1080 Insufficient Nodes in Root to Leaf Paths Medium Depth_First_Search, Tree, Binary_Tree 1 76.12
1079 Letter Tile Possibilities Medium String, Backtracking 3 86.86
1078 Occurrences After Bigram Easy String 0 100.00
1075 Project Employees I Easy Database 1524 75.86
1074 Number of Submatrices That Sum to Target Hard Array, Hash_Table, Matrix, Prefix_Sum 171 68.35
1073 Adding Two Negabinary Numbers Medium Array, Math 1 100.00
1072 Flip Columns For Maximum Number of Equal Rows Medium Array, Hash_Table, Matrix 26 95.71
1071 Greatest Common Divisor of Strings Easy String, Math 1 82.09
1070 Product Sales Analysis III Medium Database 1693 90.17
1068 Product Sales Analysis I Easy Database 1788 91.74
1061 Lexicographically Smallest Equivalent String Medium String, Union_Find 2 93.75
1054 Distant Barcodes Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 45 64.21
1053 Previous Permutation With One Swap Medium Array, Greedy 0 100.00
1052 Grumpy Bookstore Owner Medium Array, Sliding_Window 4 70.26
1051 Height Checker Easy Array, Sorting, Counting_Sort 1 94.01
1050 Actors and Directors Who Cooperated At Least Three Times Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_10_Where 344 76.48
1049 Last Stone Weight II Medium Array, Dynamic_Programming 2 95.98
1048 Longest String Chain Medium Array, String, Hash_Table, Dynamic_Programming, Two_Pointers 23 97.92
1047 Remove All Adjacent Duplicates In String Easy String, Stack 3 99.99
1046 Last Stone Weight Easy Array, Heap_Priority_Queue, Level_1_Day_15_Heap 2 73.81
1045 Customers Who Bought All Products Medium Database 1082 43.17
1044 Longest Duplicate Substring Hard String, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash, Suffix_Array 447 62.53
1043 Partition Array for Maximum Sum Medium Array, Dynamic_Programming 5 90.43
1042 Flower Planting With No Adjacent Medium Depth_First_Search, Breadth_First_Search, Graph 19 89.02
1041 Robot Bounded In Circle Medium String, Math, Simulation 0 100.00
1040 Moving Stones Until Consecutive II Medium Array, Math, Sorting, Two_Pointers 8 55.00
1039 Minimum Score Triangulation of Polygon Medium Array, Dynamic_Programming 6 38.60
1038 Binary Search Tree to Greater Sum Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00
1037 Valid Boomerang Easy Array, Math, Geometry 0 100.00
1036 Escape a Large Maze Hard Array, Hash_Table, Depth_First_Search, Breadth_First_Search 115 73.46
1035 Uncrossed Lines Medium Array, Dynamic_Programming 5 85.32
1034 Coloring A Border Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 1 93.85
1033 Moving Stones Until Consecutive Medium Math, Brainteaser 1 86.36
1032 Stream of Characters Hard Array, String, Design, Trie, Data_Stream 137 81.54
1031 Maximum Sum of Two Non-Overlapping Subarrays Medium Array, Dynamic_Programming, Sliding_Window 3 46.04
1030 Matrix Cells in Distance Order Easy Array, Math, Sorting, Matrix, Geometry 15 69.74
1029 Two City Scheduling Medium Array, Sorting, Greedy 1 97.54
1028 Recover a Tree From Preorder Traversal Hard String, Depth_First_Search, Tree, Binary_Tree 5 77.57
1027 Longest Arithmetic Subsequence Medium Array, Hash_Table, Dynamic_Programming, Binary_Search 47 98.28
1026 Maximum Difference Between Node and Ancestor Medium Depth_First_Search, Tree, Binary_Tree 1 65.84
1025 Divisor Game Easy Dynamic_Programming, Math, Game_Theory, Brainteaser 0 100.00
1024 Video Stitching Medium Array, Dynamic_Programming, Greedy 1 88.78
1023 Camelcase Matching Medium String, Two_Pointers, Trie, String_Matching 1 73.86
1022 Sum of Root To Leaf Binary Numbers Easy Depth_First_Search, Tree, Binary_Tree 3 28.58
1021 Remove Outermost Parentheses Easy String, Stack 4 75.39
1020 Number of Enclaves Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Graph_Theory_I_Day_3_Matrix_Related_Problems 6 68.24
1019 Next Greater Node In Linked List Medium Array, Stack, Linked_List, Monotonic_Stack 11 96.35
1018 Binary Prefix Divisible By 5 Easy Array 3 84.58
1017 Convert to Base -2 Medium Math 1 89.45
1016 Binary String With Substrings Representing 1 To N Medium String 0 100.00
1015 Smallest Integer Divisible by K Medium Hash_Table, Math 2 90.67
1014 Best Sightseeing Pair Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_7 2 99.86
1013 Partition Array Into Three Parts With Equal Sum Easy Array, Greedy 1 100.00
1012 Numbers With Repeated Digits Hard Dynamic_Programming, Math 3 28.17
1011 Capacity To Ship Packages Within D Days Medium Array, Binary_Search 10 75.31
1010 Pairs of Songs With Total Durations Divisible by 60 Medium Array, Hash_Table, Counting 4 64.39
1009 Complement of Base 10 Integer Easy Bit_Manipulation, Udemy_Bit_Manipulation 1 41.56
1008 Construct Binary Search Tree from Preorder Traversal Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Binary_Search_Tree, Udemy_Tree_Stack_Queue 0 100.00
1007 Minimum Domino Rotations For Equal Row Medium Array, Greedy, Udemy_Arrays 5 79.64
1006 Clumsy Factorial Medium Math, Stack, Simulation 1 87.97
1005 Maximize Sum Of Array After K Negations Easy Array, Sorting, Greedy 3 81.75
1004 Max Consecutive Ones III Medium Array, Binary_Search, Prefix_Sum, Sliding_Window 3 79.01
1003 Check If Word Is Valid After Substitutions Medium String, Stack 5 98.54
1002 Find Common Characters Easy Array, String, Hash_Table 4 83.51
1001 Grid Illumination Hard Array, Hash_Table 82 89.13
1000 Minimum Cost to Merge Stones Hard Array, Dynamic_Programming 1 99.65
0999 Available Captures for Rook Easy Array, Matrix, Simulation 0 100.00
0998 Maximum Binary Tree II Medium Tree, Binary_Tree 0 100.00
0997 Find the Town Judge Easy Array, Hash_Table, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_13_Graph_Theory 3 80.64
0996 Number of Squareful Arrays Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Backtracking, Bitmask 2 72.32
0995 Minimum Number of K Consecutive Bit Flips Hard Array, Bit_Manipulation, Prefix_Sum, Sliding_Window 6 93.95
0994 Rotting Oranges Medium Top_100_Liked_Questions, Array, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Level_2_Day_10_Graph/BFS/DFS 3 74.27
0993 Cousins in Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 60.08
0992 Subarrays with K Different Integers Hard Array, Hash_Table, Counting, Sliding_Window 4 99.36
0991 Broken Calculator Medium Math, Greedy 0 100.00
0990 Satisfiability of Equality Equations Medium Array, String, Graph, Union_Find 0 100.00
0989 Add to Array-Form of Integer Easy Array, Math, Programming_Skills_II_Day_5 7 65.92
0988 Smallest String Starting From Leaf Medium String, Depth_First_Search, Tree, Binary_Tree 4 58.47
0987 Vertical Order Traversal of a Binary Tree Hard Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 4 71.48
0986 Interval List Intersections Medium Array, Two_Pointers, Algorithm_II_Day_4_Two_Pointers 2 99.95
0985 Sum of Even Numbers After Queries Medium Array, Simulation 6 71.11
0984 String Without AAA or BBB Medium String, Greedy 0 100.00
0983 Minimum Cost For Tickets Medium Array, Dynamic_Programming 1 93.95
0982 Triples with Bitwise AND Equal To Zero Hard Array, Hash_Table, Bit_Manipulation 120 79.59
0981 Time Based Key-Value Store Medium String, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_16 239 72.78
0980 Unique Paths III Hard Array, Matrix, Bit_Manipulation, Backtracking 0 100.00
0979 Distribute Coins in Binary Tree Medium Depth_First_Search, Tree, Binary_Tree 0 100.00
0978 Longest Turbulent Subarray Medium Array, Dynamic_Programming, Sliding_Window 7 48.10
0977 Squares of a Sorted Array Easy Array, Sorting, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Two_Pointers 1 100.00
0976 Largest Perimeter Triangle Easy Array, Math, Sorting, Greedy, Programming_Skills_I_Day_3_Conditional_Statements 12 26.01
0975 Odd Even Jump Hard Array, Dynamic_Programming, Stack, Ordered_Set, Monotonic_Stack 49 98.38
0974 Subarray Sums Divisible by K Medium Array, Hash_Table, Prefix_Sum 3 99.95
0973 K Closest Points to Origin Medium Array, Math, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Geometry, Quickselect, Data_Structure_II_Day_21_Heap_Priority_Queue, Programming_Skills_II_Day_8 4 98.26
0972 Equal Rational Numbers Hard String, Math 4 56.67
0971 Flip Binary Tree To Match Preorder Traversal Medium Depth_First_Search, Tree, Binary_Tree 0 100.00
0970 Powerful Integers Medium Hash_Table, Math 1 100.00
0969 Pancake Sorting Medium Array, Sorting, Greedy, Two_Pointers 1 100.00
0968 Binary Tree Cameras Hard Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue 0 100.00
0967 Numbers With Same Consecutive Differences Medium Breadth_First_Search, Backtracking 1 100.00
0966 Vowel Spellchecker Medium Array, String, Hash_Table 17 98.95
0965 Univalued Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 17.57
0964 Least Operators to Express Number Hard Dynamic_Programming, Math 16 37.78
0963 Minimum Area Rectangle II Medium Array, Math, Geometry 12 92.95
0962 Maximum Width Ramp Medium Array, Stack, Monotonic_Stack 6 90.69
0961 N-Repeated Element in Size 2N Array Easy Array, Hash_Table 1 87.33
0960 Delete Columns to Make Sorted III Hard Array, String, Dynamic_Programming 13 43.86
0959 Regions Cut By Slashes Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 9 39.29
0958 Check Completeness of a Binary Tree Medium Breadth_First_Search, Tree, Binary_Tree 2 43.56
0957 Prison Cells After N Days Medium Array, Hash_Table, Math, Bit_Manipulation 1 97.82
0956 Tallest Billboard Hard Array, Dynamic_Programming 18 92.68
0955 Delete Columns to Make Sorted II Medium Array, String, Greedy 2 68.84
0954 Array of Doubled Pairs Medium Array, Hash_Table, Sorting, Greedy 13 98.71
0953 Verifying an Alien Dictionary Easy Array, String, Hash_Table, Programming_Skills_I_Day_9_String 0 100.00
0952 Largest Component Size by Common Factor Hard Array, Math, Union_Find 198 92.41
0951 Flip Equivalent Binary Trees Medium Depth_First_Search, Tree, Binary_Tree 0 100.00
0950 Reveal Cards In Increasing Order Medium Array, Sorting, Simulation, Queue 1 100.00
0949 Largest Time for Given Digits Medium String, Enumeration 11 70.67
0948 Bag of Tokens Medium Array, Sorting, Greedy, Two_Pointers 2 100.00
0947 Most Stones Removed with Same Row or Column Medium Depth_First_Search, Graph, Union_Find, Level_2_Day_19_Union_Find 7 98.83
0946 Validate Stack Sequences Medium Array, Stack, Simulation 1 98.95
0945 Minimum Increment to Make Array Unique Medium Array, Sorting, Greedy, Counting 5 99.79
0944 Delete Columns to Make Sorted Easy Array, String 9 87.09
0943 Find the Shortest Superstring Hard Array, String, Dynamic_Programming, Bit_Manipulation, Bitmask 16 100.00
0942 DI String Match Easy Array, String, Math, Greedy, Two_Pointers 4 33.74
0941 Valid Mountain Array Easy Array 1 100.00
0940 Distinct Subsequences II Hard String, Dynamic_Programming 2 99.41
0939 Minimum Area Rectangle Medium Array, Hash_Table, Math, Sorting, Geometry 63 94.31
0938 Range Sum of BST Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Udemy_Tree_Stack_Queue 0 100.00
0937 Reorder Data in Log Files Medium Array, String, Sorting 4 92.15
0936 Stamping The Sequence Hard String, Greedy, Stack, Queue 6 78.43
0935 Knight Dialer Medium Dynamic_Programming 4 99.08
0934 Shortest Bridge Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_6_Matrix_Related_Problems 6 97.87
0933 Number of Recent Calls Easy Design, Queue, Data_Stream 16 97.58
0932 Beautiful Array Medium Array, Math, Divide_and_Conquer 1 89.66
0931 Minimum Falling Path Sum Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_13 4 72.19
0930 Binary Subarrays With Sum Medium Array, Hash_Table, Prefix_Sum, Sliding_Window 3 84.84
0929 Unique Email Addresses Easy Array, String, Hash_Table 10 92.59
0928 Minimize Malware Spread II Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 41 31.01
0927 Three Equal Parts Hard Array, Math 2 90.20
0926 Flip String to Monotone Increasing Medium String, Dynamic_Programming 12 63.41
0925 Long Pressed Name Easy String, Two_Pointers 1 84.87
0924 Minimize Malware Spread Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 10 47.21
0923 3Sum With Multiplicity Medium Array, Hash_Table, Sorting, Two_Pointers, Counting 14 69.20
0922 Sort Array By Parity II Easy Array, Sorting, Two_Pointers 4 52.95
0921 Minimum Add to Make Parentheses Valid Medium String, Greedy, Stack 2 33.69
0920 Number of Music Playlists Hard Dynamic_Programming, Math, Combinatorics 2 96.55
0919 Complete Binary Tree Inserter Medium Breadth_First_Search, Tree, Binary_Tree, Design 11 96.06
0918 Maximum Sum Circular Subarray Medium Array, Dynamic_Programming, Divide_and_Conquer, Queue, Monotonic_Queue, Dynamic_Programming_I_Day_5 3 92.86
0917 Reverse Only Letters Easy String, Two_Pointers 0 100.00
0916 Word Subsets Medium Array, String, Hash_Table 30 57.30
0915 Partition Array into Disjoint Intervals Medium Array 2 99.81
0914 X of a Kind in a Deck of Cards Easy Array, Hash_Table, Math, Counting, Number_Theory 11 51.18
0913 Cat and Mouse Hard Dynamic_Programming, Math, Graph, Memoization, Topological_Sort, Game_Theory 16 97.20
0912 Sort an Array Medium Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Merge_Sort, Bucket_Sort, Counting_Sort, Radix_Sort, Udemy_Sorting_Algorithms 25 38.15
0911 Online Election Medium Array, Hash_Table, Binary_Search, Design, Binary_Search_II_Day_20 63 98.81
0910 Smallest Range II Medium Array, Math, Sorting, Greedy, Programming_Skills_II_Day_13 10 73.16
0909 Snakes and Ladders Medium Array, Breadth_First_Search, Matrix 7 79.52
0908 Smallest Range I Easy Array, Math 2 88.84
0907 Sum of Subarray Minimums Medium Array, Dynamic_Programming, Stack, Monotonic_Stack 20 95.88
0906 Super Palindromes Hard Math, Enumeration 229 91.38
0905 Sort Array By Parity Easy Array, Sorting, Two_Pointers 1 95.51
0904 Fruit Into Baskets Medium Array, Hash_Table, Sliding_Window 6 95.60
0903 Valid Permutations for DI Sequence Hard Dynamic_Programming 3 74.00
0902 Numbers At Most N Given Digit Set Hard Array, Dynamic_Programming, Math, Binary_Search 1 87.03
0901 Online Stock Span Medium Stack, Design, Monotonic_Stack, Data_Stream 47 76.17
0900 RLE Iterator Medium Array, Design, Counting, Iterator 3 100.00
0899 Orderly Queue Hard String, Math, Sorting 1 100.00
0898 Bitwise ORs of Subarrays Medium Array, Dynamic_Programming, Bit_Manipulation 151 97.74
0897 Increasing Order Search Tree Easy Depth_First_Search, Tree, Binary_Tree, Stack, Binary_Search_Tree 0 100.00
0896 Monotonic Array Easy Array, Programming_Skills_II_Day_1 2 86.21
0895 Maximum Frequency Stack Hard Hash_Table, Stack, Design, Ordered_Set 43 65.81
0894 All Possible Full Binary Trees Medium Dynamic_Programming, Tree, Binary_Tree, Recursion, Memoization 3 68.56
0893 Groups of Special-Equivalent Strings Medium Array, String, Hash_Table 3 99.09
0892 Surface Area of 3D Shapes Easy Array, Math, Matrix, Geometry 2 98.73
0891 Sum of Subsequence Widths Hard Array, Math, Sorting 56 30.61
0890 Find and Replace Pattern Medium Array, String, Hash_Table 1 97.13
0889 Construct Binary Tree from Preorder and Postorder Traversal Medium Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer 1 91.04
0888 Fair Candy Swap Easy Array, Hash_Table, Sorting, Binary_Search 18 68.20
0887 Super Egg Drop Hard Dynamic_Programming, Math, Binary_Search 0 100.00
0886 Possible Bipartition Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory 20 80.12
0885 Spiral Matrix III Medium Array, Matrix, Simulation 2 100.00
0884 Uncommon Words from Two Sentences Easy String, Hash_Table 1 100.00
0883 Projection Area of 3D Shapes Easy Array, Math, Matrix, Geometry 1 100.00
0882 Reachable Nodes In Subdivided Graph Hard Heap_Priority_Queue, Graph, Shortest_Path 28 95.85
0881 Boats to Save People Medium Array, Sorting, Greedy, Two_Pointers 20 61.11
0880 Decoded String at Index Medium String, Stack 0 100.00
0879 Profitable Schemes Hard Array, Dynamic_Programming 80 43.42
0878 Nth Magical Number Hard Math, Binary_Search 0 100.00
0877 Stone Game Medium Array, Dynamic_Programming, Math, Game_Theory 0 100.00
0876 Middle of the Linked List Easy Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Programming_Skills_I_Day_10_Linked_List_and_Tree, Level_1_Day_4_Linked_List, Udemy_Linked_List 0 100.00
0875 Koko Eating Bananas Medium Array, Binary_Search, Binary_Search_II_Day_4 15 91.32
0874 Walking Robot Simulation Medium Array, Simulation 16 93.75
0873 Length of Longest Fibonacci Subsequence Medium Array, Hash_Table, Dynamic_Programming 120 92.64
0872 Leaf-Similar Trees Easy Depth_First_Search, Tree, Binary_Tree 0 100.00
0871 Minimum Number of Refueling Stops Hard Array, Dynamic_Programming, Greedy, Heap_Priority_Queue 3 88.52
0870 Advantage Shuffle Medium Array, Sorting, Greedy 188 28.01
0869 Reordered Power of 2 Medium Math, Sorting, Counting, Enumeration 9 25.97
0868 Binary Gap Easy Bit_Manipulation 1 82.94
0867 Transpose Matrix Easy Array, Matrix, Simulation 1 60.83
0866 Prime Palindrome Medium Math 2 84.68
0865 Smallest Subtree with all the Deepest Nodes Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00
0864 Shortest Path to Get All Keys Hard Breadth_First_Search, Bit_Manipulation 12 100.00
0863 All Nodes Distance K in Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 12 80.25
0862 Shortest Subarray with Sum at Least K Hard Array, Binary_Search, Heap_Priority_Queue, Prefix_Sum, Sliding_Window, Queue, Monotonic_Queue 53 74.73
0861 Score After Flipping Matrix Medium Array, Greedy, Matrix, Bit_Manipulation 1 70.04
0860 Lemonade Change Easy Array, Greedy, Programming_Skills_II_Day_17 2 90.84
0859 Buddy Strings Easy String, Hash_Table 2 85.33
0858 Mirror Reflection Medium Math, Geometry 0 100.00
0857 Minimum Cost to Hire K Workers Hard Array, Sorting, Greedy, Heap_Priority_Queue 26 85.40
0856 Score of Parentheses Medium String, Stack 1 67.71
0855 Exam Room Medium Design, Ordered_Set 19 74.01
0854 K-Similar Strings Hard String, Breadth_First_Search 2 99.58
0853 Car Fleet Medium Array, Sorting, Stack, Monotonic_Stack 118 74.11
0852 Peak Index in a Mountain Array Medium Array, Binary_Search, Binary_Search_I_Day_2 0 100.00
0851 Loud and Rich Medium Array, Depth_First_Search, Graph, Topological_Sort 3 99.67
0850 Rectangle Area II Hard Array, Ordered_Set, Segment_Tree, Line_Sweep 4 97.00
0849 Maximize Distance to Closest Person Medium Array 1 100.00
0848 Shifting Letters Medium Array, String 11 88.11
0847 Shortest Path Visiting All Nodes Hard Dynamic_Programming, Breadth_First_Search, Bit_Manipulation, Graph, Bitmask, Graph_Theory_I_Day_10_Standard_Traversal 14 78.72
0846 Hand of Straights Medium Array, Hash_Table, Sorting, Greedy 19 96.16
0845 Longest Mountain in Array Medium Array, Dynamic_Programming, Two_Pointers, Enumeration 2 94.37
0844 Backspace String Compare Easy String, Two_Pointers, Stack, Simulation, Algorithm_II_Day_4_Two_Pointers, Level_1_Day_14_Stack 0 100.00
0843 Guess the Word Hard Array, String, Math, Game_Theory, Interactive 2 68.01
0842 Split Array into Fibonacci Sequence Medium String, Backtracking 4 62.81
0841 Keys and Rooms Medium Depth_First_Search, Breadth_First_Search, Graph, Data_Structure_II_Day_19_Graph, Graph_Theory_I_Day_7_Standard_Traversal 3 51.54
0840 Magic Squares In Grid Medium Array, Math, Matrix 0 100.00
0839 Similar String Groups Hard Array, String, Depth_First_Search, Breadth_First_Search, Union_Find 15 80.39
0838 Push Dominoes Medium String, Dynamic_Programming, Two_Pointers 21 73.78
0837 New 21 Game Medium Dynamic_Programming, Math, Sliding_Window, Probability_and_Statistics 5 77.70
0836 Rectangle Overlap Easy Math, Geometry 0 100.00
0835 Image Overlap Medium Array, Matrix 6 98.73
0834 Sum of Distances in Tree Hard Dynamic_Programming, Depth_First_Search, Tree, Graph 52 91.09
0833 Find And Replace in String Medium Array, String, Sorting 3 70.10
0832 Flipping an Image Easy Array, Matrix, Two_Pointers, Simulation 1 68.54
0831 Masking Personal Information Medium String 1 84.30
0830 Positions of Large Groups Easy String 2 80.94
0829 Consecutive Numbers Sum Hard Math, Enumeration 3 93.37
0828 Count Unique Characters of All Substrings of a Given String Hard String, Hash_Table, Dynamic_Programming 26 54.76
0827 Making A Large Island Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find 147 74.37
0826 Most Profit Assigning Work Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_11 21 83.83
0825 Friends Of Appropriate Ages Medium Array, Sorting, Binary_Search, Two_Pointers 3 87.71
0824 Goat Latin Easy String 2 94.82
0823 Binary Trees With Factors Medium Array, Hash_Table, Dynamic_Programming 28 80.54
0822 Card Flipping Game Medium Array, Hash_Table 2 96.55
0821 Shortest Distance to a Character Easy Array, String, Two_Pointers 3 42.73
0820 Short Encoding of Words Medium Array, String, Hash_Table, Trie 35 49.44
0819 Most Common Word Easy String, Hash_Table, Counting 10 88.85
0818 Race Car Hard Dynamic_Programming 9 82.90
0817 Linked List Components Medium Hash_Table, Linked_List 7 76.10
0816 Ambiguous Coordinates Medium String, Backtracking 4 98.95
0815 Bus Routes Hard Array, Hash_Table, Breadth_First_Search, Level_2_Day_11_Graph/BFS/DFS 49 89.11
0814 Binary Tree Pruning Medium Depth_First_Search, Tree, Binary_Tree 0 100.00
0813 Largest Sum of Averages Medium Array, Dynamic_Programming 4 97.01
0812 Largest Triangle Area Easy Array, Math, Geometry 5 92.04
0811 Subdomain Visit Count Medium Array, String, Hash_Table, Counting 5 100.00
0810 Chalkboard XOR Game Hard Array, Math, Bit_Manipulation, Game_Theory, Brainteaser 0 100.00
0809 Expressive Words Medium Array, String, Two_Pointers 2 86.09
0808 Soup Servings Medium Dynamic_Programming, Math, Probability_and_Statistics 1 96.04
0807 Max Increase to Keep City Skyline Medium Array, Greedy, Matrix 2 23.49
0806 Number of Lines To Write String Easy Array, String 1 65.23
0805 Split Array With Same Average Hard Array, Dynamic_Programming, Math, Bit_Manipulation, Bitmask 1 100.00
0804 Unique Morse Code Words Easy Array, String, Hash_Table 2 89.27
0803 Bricks Falling When Hit Hard Array, Matrix, Union_Find 12 94.92
0802 Find Eventual Safe States Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Graph_Theory_I_Day_9_Standard_Traversal 7 74.93
0801 Minimum Swaps To Make Sequences Increasing Hard Array, Dynamic_Programming 6 71.94
0799 Champagne Tower Medium Dynamic_Programming 4 92.45
0798 Smallest Rotation with Highest Score Hard Array, Prefix_Sum 9 78.22
0797 All Paths From Source to Target Medium Depth_First_Search, Breadth_First_Search, Graph, Backtracking, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_7_Standard_Traversal 2 90.53
0796 Rotate String Easy String, String_Matching 0 100.00
0795 Number of Subarrays with Bounded Maximum Medium Array, Two_Pointers 2 100.00
0794 Valid Tic-Tac-Toe State Medium Array, String 0 100.00
0793 Preimage Size of Factorial Zeroes Function Hard Math, Binary_Search 0 100.00
0792 Number of Matching Subsequences Medium String, Hash_Table, Sorting, Trie 92 84.26
0791 Custom Sort String Medium String, Hash_Table, Sorting 1 78.82
0790 Domino and Tromino Tiling Medium Dynamic_Programming 0 100.00
0789 Escape The Ghosts Medium Array, Math 0 100.00
0788 Rotated Digits Medium Dynamic_Programming, Math 2 98.95
0787 Cheapest Flights Within K Stops Medium Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 9 53.93
0786 K-th Smallest Prime Fraction Medium Array, Binary_Search, Heap_Priority_Queue 2 96.60
0785 Is Graph Bipartite? Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Graph_Theory_I_Day_14_Graph_Theory 0 100.00
0784 Letter Case Permutation Medium String, Bit_Manipulation, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 10 40.38
0783 Minimum Distance Between BST Nodes Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00
0782 Transform to Chessboard Hard Array, Math, Matrix, Bit_Manipulation 2 53.57
0781 Rabbits in Forest Medium Array, Hash_Table, Math, Greedy 1 99.15
0780 Reaching Points Hard Math 0 100.00
0779 K-th Symbol in Grammar Medium Math, Bit_Manipulation, Recursion 0 100.00
0778 Swim in Rising Water Hard Array, Depth_First_Search, Breadth_First_Search, Binary_Search, Matrix, Heap_Priority_Queue, Union_Find 13 69.75
0777 Swap Adjacent in LR String Medium String, Two_Pointers 4 85.13
0775 Global and Local Inversions Medium Array, Math 1 99.74
0773 Sliding Puzzle Hard Array, Breadth_First_Search, Matrix 9 81.80
0771 Jewels and Stones Easy String, Hash_Table 1 91.74
0770 Basic Calculator IV Hard String, Hash_Table, Math, Stack, Recursion 8 96.92
0769 Max Chunks To Make Sorted Medium Array, Sorting, Greedy, Stack, Monotonic_Stack 0 100.00
0768 Max Chunks To Make Sorted II Hard Array, Sorting, Greedy, Stack, Monotonic_Stack 1 87.58
0767 Reorganize String Medium String, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting 1 94.60
0766 Toeplitz Matrix Easy Array, Matrix 1 83.45
0765 Couples Holding Hands Hard Depth_First_Search, Greedy, Breadth_First_Search, Graph, Union_Find 0 100.00
0764 Largest Plus Sign Medium Array, Dynamic_Programming 39 87.23
0763 Partition Labels Medium String, Hash_Table, Greedy, Two_Pointers, Data_Structure_II_Day_7_String, Big_O_Time_O(n)_Space_O(1) 2 100.00
0762 Prime Number of Set Bits in Binary Representation Easy Math, Bit_Manipulation 4 98.39
0761 Special Binary String Hard String, Recursion 1 100.00
0757 Set Intersection Size At Least Two Hard Array, Sorting, Greedy 4 100.00
0756 Pyramid Transition Matrix Medium Depth_First_Search, Breadth_First_Search, Bit_Manipulation 129 82.94
0754 Reach a Number Medium Math, Binary_Search 0 100.00
0753 Cracking the Safe Hard Depth_First_Search, Graph, Eulerian_Circuit 4 96.44
0752 Open the Lock Medium Array, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 72 91.06
0749 Contain Virus Hard Array, Depth_First_Search, Breadth_First_Search, Matrix, Simulation 23 37.62
0748 Shortest Completing Word Easy Array, String, Hash_Table 3 93.75
0747 Largest Number At Least Twice of Others Easy Array, Sorting 0 100.00
0746 Min Cost Climbing Stairs Easy Array, Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_11_Dynamic_Programming 1 86.38
0745 Prefix and Suffix Search Hard String, Design, Trie, Udemy_Trie_and_Heap 366 76.15
0744 Find Smallest Letter Greater Than Target Easy Array, Binary_Search, Binary_Search_I_Day_4 0 100.00
0743 Network Delay Time Medium Depth_First_Search, Breadth_First_Search, Heap_Priority_Queue, Graph, Shortest_Path 3 99.87
0741 Cherry Pickup Hard Array, Dynamic_Programming, Matrix 11 99.40
0740 Delete and Earn Medium Array, Hash_Table, Dynamic_Programming, Dynamic_Programming_I_Day_3 4 77.68
0739 Daily Temperatures Medium Top_100_Liked_Questions, Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_6, Big_O_Time_O(n)_Space_O(n) 8 96.83
0738 Monotone Increasing Digits Medium Math, Greedy 0 100.00
0736 Parse Lisp Expression Hard String, Hash_Table, Stack, Recursion 4 95.58
0735 Asteroid Collision Medium Array, Stack, Level_2_Day_18_Stack 2 99.59
0733 Flood Fill Easy Array, Depth_First_Search, Breadth_First_Search, Matrix, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS 1 85.36
0732 My Calendar III Hard Binary_Search, Design, Ordered_Set, Segment_Tree 40 95.37
0731 My Calendar II Medium Binary_Search, Design, Ordered_Set, Segment_Tree 27 97.74
0730 Count Different Palindromic Subsequences Hard String, Dynamic_Programming 45 92.84
0729 My Calendar I Medium Binary_Search, Design, Ordered_Set, Segment_Tree, Programming_Skills_II_Day_20 17 97.23
0728 Self Dividing Numbers Easy Math 1 100.00
0726 Number of Atoms Hard String, Hash_Table, Sorting, Stack 4 87.22
0725 Split Linked List in Parts Medium Linked_List 1 30.85
0724 Find Pivot Index Easy Array, Prefix_Sum, Level_1_Day_1_Prefix_Sum 2 69.67
0722 Remove Comments Medium Array, String 1 80.24
0721 Accounts Merge Medium Array, String, Depth_First_Search, Breadth_First_Search, Union_Find 71 31.21
0720 Longest Word in Dictionary Medium Array, String, Hash_Table, Sorting, Trie 13 84.66
0719 Find K-th Smallest Pair Distance Hard Array, Sorting, Binary_Search, Two_Pointers 8 81.40
0718 Maximum Length of Repeated Subarray Medium Array, Dynamic_Programming, Binary_Search, Sliding_Window, Hash_Function, Rolling_Hash 58 77.21
0717 1-bit and 2-bit Characters Easy Array 0 100.00
0715 Range Module Hard Design, Ordered_Set, Segment_Tree 35 98.62
0714 Best Time to Buy and Sell Stock with Transaction Fee Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_8 4 78.57
0713 Subarray Product Less Than K Medium Array, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Udemy_Arrays 8 39.00
0712 Minimum ASCII Delete Sum for Two Strings Medium String, Dynamic_Programming 18 91.28
0710 Random Pick with Blacklist Hard Hash_Table, Math, Sorting, Binary_Search, Randomized 56 74.41
0709 To Lower Case Easy String, Programming_Skills_I_Day_9_String 1 71.74
0707 Design Linked List Medium Design, Linked_List, Data_Structure_II_Day_12_Linked_List, Programming_Skills_II_Day_19, Udemy_Linked_List 10 70.60
0706 Design HashMap Easy Array, Hash_Table, Design, Linked_List, Hash_Function, Data_Structure_II_Day_2_Array 13 95.71
0705 Design HashSet Easy Array, Hash_Table, Design, Linked_List, Hash_Function 29 57.06
0704 Binary Search Easy Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_1, Level_1_Day_7_Binary_Search, Udemy_Binary_Search 0 100.00
0703 Kth Largest Element in a Stream Easy Tree, Binary_Tree, Design, Heap_Priority_Queue, Binary_Search_Tree, Data_Stream 22 52.43
0701 Insert into a Binary Search Tree Medium Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree, Udemy_Tree_Stack_Queue 0 100.00
0700 Search in a Binary Search Tree Easy Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_13_Tree 0 100.00
0699 Falling Squares Hard Array, Ordered_Set, Segment_Tree 8 91.03
0698 Partition to K Equal Sum Subsets Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization 24 85.43
0697 Degree of an Array Easy Array, Hash_Table, Udemy_Arrays 14 93.19
0696 Count Binary Substrings Easy String, Two_Pointers 5 100.00
0695 Max Area of Island Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_I_Day_7_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_2_Matrix_Related_Problems 3 76.79
0693 Binary Number with Alternating Bits Easy Bit_Manipulation 0 100.00
0692 Top K Frequent Words Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Trie, Bucket_Sort, Level_1_Day_15_Heap 11 38.54
0691 Stickers to Spell Word Hard Array, String, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 34 70.23
0690 Employee Importance Medium Hash_Table, Depth_First_Search, Breadth_First_Search 7 77.84
0689 Maximum Sum of 3 Non-Overlapping Subarrays Hard Array, Dynamic_Programming 5 64.24
0688 Knight Probability in Chessboard Medium Dynamic_Programming 7 85.13
0687 Longest Univalue Path Medium Depth_First_Search, Tree, Binary_Tree 3 79.43
0686 Repeated String Match Medium String, String_Matching 7 94.56
0685 Redundant Connection II Hard Depth_First_Search, Breadth_First_Search, Graph, Union_Find 1 96.65
0684 Redundant Connection Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find 0 100.00
0682 Baseball Game Easy Array, Stack, Simulation 4 57.60
0680 Valid Palindrome II Easy String, Greedy, Two_Pointers 10 61.31
0679 24 Game Hard Array, Math, Backtracking 3 87.01
0678 Valid Parenthesis String Medium String, Dynamic_Programming, Greedy, Stack 0 100.00
0677 Map Sum Pairs Medium String, Hash_Table, Design, Trie 17 70.10
0676 Implement Magic Dictionary Medium String, Hash_Table, Design, Trie 38 86.83
0675 Cut Off Trees for Golf Event Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 417 73.86
0674 Longest Continuous Increasing Subsequence Easy Array 2 40.35
0673 Number of Longest Increasing Subsequence Medium Array, Dynamic_Programming, Segment_Tree, Binary_Indexed_Tree, Algorithm_II_Day_16_Dynamic_Programming 25 68.75
0672 Bulb Switcher II Medium Math, Depth_First_Search, Breadth_First_Search, Bit_Manipulation 0 100.00
0671 Second Minimum Node In a Binary Tree Easy Depth_First_Search, Tree, Binary_Tree 0 100.00
0670 Maximum Swap Medium Math, Greedy 1 80.14
0669 Trim a Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 0 100.00
0668 Kth Smallest Number in Multiplication Table Hard Math, Binary_Search 12 97.84
0667 Beautiful Arrangement II Medium Array, Math 1 84.62
0665 Non-decreasing Array Medium Array 1 86.75
0664 Strange Printer Hard String, Dynamic_Programming 24 76.35
0662 Maximum Width of Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 78.93
0661 Image Smoother Easy Array, Matrix 2 100.00
0659 Split Array into Consecutive Subsequences Medium Array, Hash_Table, Greedy, Heap_Priority_Queue 4 95.88
0658 Find K Closest Elements Medium Array, Sorting, Binary_Search, Two_Pointers, Heap_Priority_Queue, Binary_Search_II_Day_2 3 99.20
0657 Robot Return to Origin Easy String, Simulation 3 99.87
0655 Print Binary Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 1 98.04
0654 Maximum Binary Tree Medium Array, Tree, Binary_Tree, Stack, Monotonic_Stack, Divide_and_Conquer 3 84.36
0653 Two Sum IV - Input is a BST Easy Hash_Table, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Two_Pointers, Binary_Search_Tree, Data_Structure_I_Day_14_Tree 5 74.23
0652 Find Duplicate Subtrees Medium Hash_Table, Depth_First_Search, Tree, Binary_Tree 32 60.16
0650 2 Keys Keyboard Medium Dynamic_Programming, Math 0 100.00
0649 Dota2 Senate Medium String, Greedy, Queue 4 95.00
0648 Replace Words Medium Array, String, Hash_Table, Trie 14 87.12
0647 Palindromic Substrings Medium String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n) 2 99.31
0646 Maximum Length of Pair Chain Medium Array, Dynamic_Programming, Sorting, Greedy 11 88.84
0645 Set Mismatch Easy Array, Hash_Table, Sorting, Bit_Manipulation 2 97.45
0643 Maximum Average Subarray I Easy Array, Sliding_Window 5 74.81
0641 Design Circular Deque Medium Array, Design, Linked_List, Queue 3 100.00
0640 Solve the Equation Medium String, Math, Simulation 5 69.29
0639 Decode Ways II Hard String, Dynamic_Programming 22 93.12
0638 Shopping Offers Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask, Memoization 6 71.06
0637 Average of Levels in Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 89.32
0636 Exclusive Time of Functions Medium Array, Stack 17 76.73
0633 Sum of Square Numbers Medium Math, Binary_Search, Two_Pointers, Binary_Search_I_Day_10 4 82.92
0632 Smallest Range Covering Elements from K Lists Hard Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Sliding_Window 31 87.39
0630 Course Schedule III Hard Array, Greedy, Heap_Priority_Queue 53 58.83
0629 K Inverse Pairs Array Hard Dynamic_Programming 19 94.44
0628 Maximum Product of Three Numbers Easy Array, Math, Sorting 2 99.90
0627 Swap Salary Easy Database, SQL_I_Day_2_Select_and_Order 191 96.89
0626 Exchange Seats Medium Database 274 65.75
0623 Add One Row to Tree Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00
0622 Design Circular Queue Medium Array, Design, Linked_List, Queue, Programming_Skills_II_Day_20 3 100.00
0621 Task Scheduler Medium Array, Hash_Table, Sorting, Greedy, Heap_Priority_Queue, Counting, Level_2_Day_5_Greedy 3 84.32
0620 Not Boring Movies Easy Database 258 28.33
0619 Biggest Single Number Easy Database 779 66.08
0617 Merge Two Binary Trees Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search 1 72.47
0611 Valid Triangle Number Medium Array, Sorting, Greedy, Binary_Search, Two_Pointers, Binary_Search_II_Day_1 10 100.00
0610 Triangle Judgement Easy Database 499 62.77
0609 Find Duplicate File in System Medium Array, String, Hash_Table 20 97.68
0608 Tree Node Medium LeetCode_Curated_SQL_70, Database, SQL_I_Day_4_Union_and_Select 347 95.17
0607 Sales Person Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_6_Union 1046 86.04
0606 Construct String from Binary Tree Medium String, Depth_First_Search, Tree, Binary_Tree 1 100.00
0605 Can Place Flowers Easy Array, Greedy, Udemy_Arrays 1 96.77
0602 Friend Requests II: Who Has the Most Friends Medium Database 510 60.15
0601 Human Traffic of Stadium Hard Database 328 62.41
0600 Non-negative Integers without Consecutive Ones Hard Dynamic_Programming 2 74.62
0599 Minimum Index Sum of Two Lists Easy Array, String, Hash_Table 7 93.97
0598 Range Addition II Easy Array, Math 0 100.00
0596 Classes More Than 5 Students Easy Database 290 74.62
0595 Big Countries Easy Database, SQL_I_Day_1_Select 262 84.64
0594 Longest Harmonious Subsequence Easy Array, Hash_Table, Sorting 16 95.95
0593 Valid Square Medium Math, Geometry 1 97.24
0592 Fraction Addition and Subtraction Medium String, Math, Simulation 6 91.33
0591 Tag Validator Hard String, Stack 2 94.35
0590 N-ary Tree Postorder Traversal Easy Depth_First_Search, Tree, Stack 1 90.45
0589 N-ary Tree Preorder Traversal Easy Depth_First_Search, Tree, Stack, Programming_Skills_I_Day_5_Function, Level_1_Day_6_Tree 1 90.98
0587 Erect the Fence Hard Array, Math, Geometry 12 90.91
0586 Customer Placing the Largest Number of Orders Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function 484 66.42
0585 Investments in 2016 Medium Database 729 99.22
0584 Find Customer Referee Easy Database, SQL_I_Day_1_Select 531 58.63
0583 Delete Operation for Two Strings Medium String, Dynamic_Programming, Algorithm_II_Day_17_Dynamic_Programming 12 79.10
0581 Shortest Unsorted Continuous Subarray Medium Array, Sorting, Greedy, Two_Pointers, Stack, Monotonic_Stack 2 84.72
0577 Employee Bonus Easy Database 1473 95.83
0576 Out of Boundary Paths Medium Dynamic_Programming 5 92.95
0575 Distribute Candies Easy Array, Hash_Table 67 42.81
0572 Subtree of Another Tree Easy Depth_First_Search, Tree, Binary_Tree, Hash_Function, String_Matching, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search 2 97.06
0570 Managers with at Least 5 Direct Reports Medium Database 503 69.79
0567 Permutation in String Medium Top_100_Liked_Questions, String, Hash_Table, Two_Pointers, Sliding_Window, Algorithm_I_Day_6_Sliding_Window 5 93.93
0566 Reshape the Matrix Easy Array, Matrix, Simulation, Data_Structure_I_Day_4_Array, Programming_Skills_I_Day_7_Array 1 90.08
0565 Array Nesting Medium Array, Depth_First_Search 5 95.44
0564 Find the Closest Palindrome Hard String, Math 2 100.00
0563 Binary Tree Tilt Easy Depth_First_Search, Tree, Binary_Tree 1 81.35
0561 Array Partition I Easy Array, Sorting, Greedy, Counting_Sort 14 84.99
0560 Subarray Sum Equals K Medium Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Data_Structure_II_Day_5_Array, Big_O_Time_O(n)_Space_O(n) 22 95.17
0559 Maximum Depth of N-ary Tree Easy Depth_First_Search, Breadth_First_Search, Tree 1 83.49
0558 Logical OR of Two Binary Grids Represented as Quad-Trees Medium Tree, Divide_and_Conquer 0 100.00
0557 Reverse Words in a String III Easy String, Two_Pointers, Algorithm_I_Day_4_Two_Pointers 4 97.75
0556 Next Greater Element III Medium String, Math, Two_Pointers, Programming_Skills_II_Day_10 0 100.00
0554 Brick Wall Medium Array, Hash_Table 12 87.69
0553 Optimal Division Medium Array, Dynamic_Programming, Math 0 100.00
0552 Student Attendance Record II Hard Dynamic_Programming 11 98.55
0551 Student Attendance Record I Easy String 0 100.00
0550 Game Play Analysis IV Medium Database 685 100.00
0547 Number of Provinces Medium Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_8_Standard_Traversal, Level_2_Day_19_Union_Find 2 69.51
0546 Remove Boxes Hard Array, Dynamic_Programming, Memoization 45 95.58
0543 Diameter of Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 0 100.00
0542 01 Matrix Medium Array, Dynamic_Programming, Breadth_First_Search, Matrix, Algorithm_I_Day_9_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_5_Matrix_Related_Problems 7 95.83
0541 Reverse String II Easy String, Two_Pointers 1 100.00
0540 Single Element in a Sorted Array Medium Array, Binary_Search, Binary_Search_II_Day_9 0 100.00
0539 Minimum Time Difference Medium Array, String, Math, Sorting 2 99.62
0538 Convert BST to Greater Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 88.41
0537 Complex Number Multiplication Medium String, Math, Simulation 6 71.88
0535 Encode and Decode TinyURL Medium String, Hash_Table, Design, Hash_Function 2 89.67
0532 K-diff Pairs in an Array Medium Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Udemy_Arrays 13 58.23
0530 Minimum Absolute Difference in BST Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 92.05
0529 Minesweeper Medium Array, Depth_First_Search, Breadth_First_Search, Matrix 0 100.00
0528 Random Pick with Weight Medium Math, Binary_Search, Prefix_Sum, Randomized, Binary_Search_II_Day_13 42 50.90
0526 Beautiful Arrangement Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 3 98.66
0525 Contiguous Array Medium Array, Hash_Table, Prefix_Sum 31 80.05
0524 Longest Word in Dictionary through Deleting Medium Array, String, Sorting, Two_Pointers 19 89.67
0523 Continuous Subarray Sum Medium Array, Hash_Table, Math, Prefix_Sum 37 41.45
0522 Longest Uncommon Subsequence II Medium Array, String, Hash_Table, Sorting, Two_Pointers 1 99.61
0521 Longest Uncommon Subsequence I Easy String 0 100.00
0520 Detect Capital Easy String 2 65.95
0519 Random Flip Matrix Medium Hash_Table, Math, Randomized, Reservoir_Sampling 38 79.28
0518 Coin Change 2 Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_20 4 84.67
0517 Super Washing Machines Hard Array, Greedy 1 94.02
0516 Longest Palindromic Subsequence Medium String, Dynamic_Programming, Dynamic_Programming_I_Day_17 88 58.87
0515 Find Largest Value in Each Tree Row Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 2 85.27
0514 Freedom Trail Hard String, Dynamic_Programming, Depth_First_Search, Breadth_First_Search 8 95.63
0513 Find Bottom Left Tree Value Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree 0 100.00
0511 Game Play Analysis I Easy LeetCode_Curated_SQL_70, Database, SQL_I_Day_8_Function 586 56.94
0509 Fibonacci Number Easy Dynamic_Programming, Math, Recursion, Memoization, Dynamic_Programming_I_Day_1, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming 0 100.00
0508 Most Frequent Subtree Sum Medium Hash_Table, Depth_First_Search, Tree, Binary_Tree 4 96.83
0507 Perfect Number Easy Math 2 80.46
0506 Relative Ranks Easy Array, Sorting, Heap_Priority_Queue 11 72.65
0504 Base 7 Easy Math 0 100.00
0503 Next Greater Element II Medium Array, Stack, Monotonic_Stack, Programming_Skills_II_Day_10 7 97.03
0502 IPO Hard Array, Sorting, Greedy, Heap_Priority_Queue 51 89.62
0501 Find Mode in Binary Search Tree Easy Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 1 92.14
0500 Keyboard Row Easy Array, String, Hash_Table 1 82.00
0498 Diagonal Traverse Medium Array, Matrix, Simulation 4 59.46
0497 Random Point in Non-overlapping Rectangles Medium Math, Binary_Search, Prefix_Sum, Ordered_Set, Randomized, Reservoir_Sampling 53 94.83
0496 Next Greater Element I Easy Array, Hash_Table, Stack, Monotonic_Stack, Programming_Skills_I_Day_5_Function 4 81.18
0495 Teemo Attacking Easy Array, Simulation 2 97.97
0494 Target Sum Medium Array, Dynamic_Programming, Backtracking, Big_O_Time_O(n*(sum+s))_Space_O(n*(sum+s)) 4 92.28
0493 Reverse Pairs Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 92 52.08
0492 Construct the Rectangle Easy Math 1 74.88
0491 Increasing Subsequences Medium Array, Hash_Table, Bit_Manipulation, Backtracking 24 38.30
0488 Zuma Game Hard String, Dynamic_Programming, Breadth_First_Search, Memoization 370 90.36
0486 Predict the Winner Medium Array, Dynamic_Programming, Math, Recursion, Game_Theory 1 85.17
0485 Max Consecutive Ones Easy Array 1 100.00
0483 Smallest Good Base Hard Math, Binary_Search 2 96.00
0482 License Key Formatting Easy String 8 96.52
0481 Magical String Medium String, Two_Pointers 5 93.33
0480 Sliding Window Median Hard Array, Hash_Table, Heap_Priority_Queue, Sliding_Window 60 70.77
0479 Largest Palindrome Product Hard Math 6 87.50
0478 Generate Random Point in a Circle Medium Math, Geometry, Randomized, Rejection_Sampling 342 56.21
0477 Total Hamming Distance Medium Array, Math, Bit_Manipulation 5 95.10
0476 Number Complement Easy Bit_Manipulation 0 100.00
0475 Heaters Medium Array, Sorting, Binary_Search, Two_Pointers 9 99.61
0474 Ones and Zeroes Medium Array, String, Dynamic_Programming 41 60.42
0473 Matchsticks to Square Medium Array, Dynamic_Programming, Bit_Manipulation, Backtracking, Bitmask 165 53.96
0472 Concatenated Words Hard Array, String, Dynamic_Programming, Depth_First_Search, Trie 84 74.09
0470 Implement Rand10() Using Rand7() Medium Math, Randomized, Probability_and_Statistics, Rejection_Sampling 8 82.15
0468 Validate IP Address Medium String 2 73.87
0467 Unique Substrings in Wraparound String Medium String, Dynamic_Programming 4 98.79
0466 Count The Repetitions Hard String, Dynamic_Programming 1 100.00
0464 Can I Win Medium Dynamic_Programming, Math, Bit_Manipulation, Bitmask, Memoization, Game_Theory 138 90.47
0463 Island Perimeter Easy Array, Depth_First_Search, Breadth_First_Search, Matrix 9 81.80
0462 Minimum Moves to Equal Array Elements II Medium Array, Math, Sorting 7 31.31
0461 Hamming Distance Easy Bit_Manipulation, Udemy_Bit_Manipulation 0 100.00
0460 LFU Cache Hard Hash_Table, Design, Linked_List, Doubly_Linked_List 86 81.25
0459 Repeated Substring Pattern Easy String, String_Matching, Programming_Skills_II_Day_2 8 96.64
0458 Poor Pigs Hard Dynamic_Programming, Math, Combinatorics 0 100.00
0457 Circular Array Loop Medium Array, Hash_Table, Two_Pointers 1 83.72
0456 132 Pattern Medium Array, Binary_Search, Stack, Ordered_Set, Monotonic_Stack, Udemy_Arrays 16 82.41
0455 Assign Cookies Easy Array, Sorting, Greedy 12 41.00
0454 4Sum II Medium Array, Hash_Table 133 95.19
0453 Minimum Moves to Equal Array Elements Medium Array, Math 2 89.66
0452 Minimum Number of Arrows to Burst Balloons Medium Array, Sorting, Greedy 84 71.26
0451 Sort Characters By Frequency Medium String, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Bucket_Sort, Data_Structure_II_Day_21_Heap_Priority_Queue 13 89.63
0450 Delete Node in a BST Medium Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_16_Tree 0 100.00
0449 Serialize and Deserialize BST Medium String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Binary_Search_Tree 1 99.59
0448 Find All Numbers Disappeared in an Array Easy Array, Hash_Table, Udemy_Arrays 3 100.00
0447 Number of Boomerangs Medium Array, Hash_Table, Math 156 80.44
0446 Arithmetic Slices II - Subsequence Hard Array, Dynamic_Programming 68 99.15
0445 Add Two Numbers II Medium Math, Stack, Linked_List, Programming_Skills_II_Day_15, Udemy_Linked_List 3 90.38
0443 String Compression Medium String, Two_Pointers 2 65.35
0442 Find All Duplicates in an Array Medium Array, Hash_Table, Udemy_Arrays 5 98.83
0441 Arranging Coins Easy Math, Binary_Search, Binary_Search_I_Day_6 2 95.97
0440 K-th Smallest in Lexicographical Order Hard Trie 0 100.00
0438 Find All Anagrams in a String Medium Top_100_Liked_Questions, String, Hash_Table, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Programming_Skills_II_Day_12, Level_1_Day_12_Sliding_Window/Two_Pointer, Big_O_Time_O(n+m)_Space_O(1) 3 99.83
0437 Path Sum III Medium Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n) 2 100.00
0436 Find Right Interval Medium Array, Sorting, Binary_Search, Binary_Search_II_Day_11 20 81.51
0435 Non-overlapping Intervals Medium Array, Dynamic_Programming, Sorting, Greedy, Data_Structure_II_Day_4_Array 96 47.37
0434 Number of Segments in a String Easy String 0 100.00
0433 Minimum Genetic Mutation Medium String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 1 90.95
0432 All O`one Data Structure Hard Hash_Table, Design, Linked_List, Doubly_Linked_List 101 52.51
0430 Flatten a Multilevel Doubly Linked List Medium Depth_First_Search, Linked_List, Doubly_Linked_List 0 100.00
0429 N-ary Tree Level Order Traversal Medium Breadth_First_Search, Tree, Programming_Skills_II_Day_9 3 80.26
0427 Construct Quad Tree Medium Array, Tree, Matrix, Divide_and_Conquer 0 100.00
0424 Longest Repeating Character Replacement Medium String, Hash_Table, Sliding_Window, Level_1_Day_12_Sliding_Window/Two_Pointer 5 95.15
0423 Reconstruct Original Digits from English Medium String, Hash_Table, Math 6 89.85
0421 Maximum XOR of Two Numbers in an Array Medium Array, Hash_Table, Bit_Manipulation, Trie 14 100.00
0420 Strong Password Checker Hard String, Greedy, Heap_Priority_Queue 0 100.00
0419 Battleships in a Board Medium Array, Depth_First_Search, Matrix 0 100.00
0417 Pacific Atlantic Water Flow Medium Array, Depth_First_Search, Breadth_First_Search, Matrix, Graph_Theory_I_Day_4_Matrix_Related_Problems, Level_2_Day_10_Graph/BFS/DFS, Udemy_Graph 5 92.62
0416 Partition Equal Subset Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Level_2_Day_13_Dynamic_Programming, Big_O_Time_O(n*sums)_Space_O(n*sums) 5 99.88
0415 Add Strings Easy String, Math, Simulation, Data_Structure_II_Day_6_String 3 82.41
0414 Third Maximum Number Easy Array, Sorting 1 97.59
0413 Arithmetic Slices Medium Array, Dynamic_Programming, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_10 0 100.00
0412 Fizz Buzz Easy String, Math, Simulation, Udemy_Integers 1 100.00
0410 Split Array Largest Sum Hard Array, Dynamic_Programming, Greedy, Binary_Search 1 86.51
0409 Longest Palindrome Easy String, Hash_Table, Greedy, Data_Structure_II_Day_6_String, Level_1_Day_5_Greedy 2 92.90
0407 Trapping Rain Water II Hard Array, Breadth_First_Search, Matrix, Heap_Priority_Queue 15 96.81
0406 Queue Reconstruction by Height Medium Array, Sorting, Greedy, Segment_Tree, Binary_Indexed_Tree 5 99.82
0405 Convert a Number to Hexadecimal Easy Math, Bit_Manipulation 1 71.02
0404 Sum of Left Leaves Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree 1 29.26
0403 Frog Jump Hard Array, Dynamic_Programming 13 99.06
0402 Remove K Digits Medium String, Greedy, Stack, Monotonic_Stack 4 99.66
0401 Binary Watch Easy Bit_Manipulation, Backtracking 1 99.26
0400 Nth Digit Medium Math, Binary_Search 0 100.00
0399 Evaluate Division Medium Array, Depth_First_Search, Breadth_First_Search, Graph, Union_Find, Shortest_Path 1 99.52
0398 Random Pick Index Medium Hash_Table, Math, Randomized, Reservoir_Sampling 102 83.94
0397 Integer Replacement Medium Dynamic_Programming, Greedy, Bit_Manipulation, Memoization 1 66.03
0396 Rotate Function Medium Array, Dynamic_Programming, Math 4 81.33
0395 Longest Substring with At Least K Repeating Characters Medium String, Hash_Table, Sliding_Window, Divide_and_Conquer 0 100.00
0394 Decode String Medium Top_100_Liked_Questions, String, Stack, Recursion, Level_1_Day_14_Stack, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) 0 100.00
0393 UTF-8 Validation Medium Array, Bit_Manipulation 1 100.00
0392 Is Subsequence Easy String, Dynamic_Programming, Two_Pointers, Dynamic_Programming_I_Day_19, Level_1_Day_2_String, Udemy_Two_Pointers 1 93.01
0391 Perfect Rectangle Hard Array, Line_Sweep 67 54.55
0390 Elimination Game Medium Math, Recursion 4 81.16
0389 Find the Difference Easy String, Hash_Table, Sorting, Bit_Manipulation, Programming_Skills_I_Day_8_String, Udemy_Bit_Manipulation 1 100.00
0388 Longest Absolute File Path Medium String, Depth_First_Search, Stack 1 95.33
0387 First Unique Character in a String Easy String, Hash_Table, Counting, Queue, Data_Structure_I_Day_6_String 1 100.00
0386 Lexicographical Numbers Medium Depth_First_Search, Trie 4 93.65
0385 Mini Parser Medium String, Depth_First_Search, Stack 2 97.82
0384 Shuffle an Array Medium Array, Math, Randomized, Algorithm_II_Day_20_Others 52 91.77
0383 Ransom Note Easy String, Hash_Table, Counting, Data_Structure_I_Day_6_String 1 99.97
0382 Linked List Random Node Medium Math, Linked_List, Randomized, Reservoir_Sampling 11 91.81
0381 Insert Delete GetRandom O(1) - Duplicates allowed Hard Array, Hash_Table, Math, Design, Randomized 63 50.82
0380 Insert Delete GetRandom O(1) Medium Array, Hash_Table, Math, Design, Randomized, Programming_Skills_II_Day_20 27 93.44
0378 Kth Smallest Element in a Sorted Matrix Medium Array, Sorting, Binary_Search, Matrix, Heap_Priority_Queue 1 92.14
0377 Combination Sum IV Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_21 1 92.54
0376 Wiggle Subsequence Medium Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_18 0 100.00
0375 Guess Number Higher or Lower II Medium Dynamic_Programming, Math, Game_Theory 2 100.00
0374 Guess Number Higher or Lower Easy Binary_Search, Interactive, Binary_Search_I_Day_1 0 100.00
0373 Find K Pairs with Smallest Sums Medium Array, Heap_Priority_Queue 59 46.79
0372 Super Pow Medium Math, Divide_and_Conquer 1 100.00
0371 Sum of Two Integers Medium Math, Bit_Manipulation, Udemy_Bit_Manipulation 0 100.00
0368 Largest Divisible Subset Medium Array, Dynamic_Programming, Math, Sorting 24 87.83
0367 Valid Perfect Square Easy Math, Binary_Search, Binary_Search_I_Day_3 0 100.00
0365 Water and Jug Problem Medium Math, Depth_First_Search, Breadth_First_Search, Graph_Theory_I_Day_11_Breadth_First_Search 0 100.00
0363 Max Sum of Rectangle No Larger Than K Hard Array, Dynamic_Programming, Binary_Search, Matrix, Ordered_Set 70 99.21
0357 Count Numbers with Unique Digits Medium Dynamic_Programming, Math, Backtracking 0 100.00
0355 Design Twitter Medium Hash_Table, Design, Heap_Priority_Queue, Linked_List 14 74.65
0354 Russian Doll Envelopes Hard Array, Dynamic_Programming, Sorting, Binary_Search 46 99.83
0352 Data Stream as Disjoint Intervals Hard Binary_Search, Design, Ordered_Set 109 62.48
0350 Intersection of Two Arrays II Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers, Data_Structure_I_Day_3_Array, Binary_Search_I_Day_10 4 69.62
0349 Intersection of Two Arrays Easy Array, Hash_Table, Sorting, Binary_Search, Two_Pointers 1 99.77
0347 Top K Frequent Elements Medium Top_100_Liked_Questions, Array, Hash_Table, Sorting, Heap_Priority_Queue, Counting, Divide_and_Conquer, Quickselect, Bucket_Sort, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(k) 9 97.30
0345 Reverse Vowels of a String Easy String, Two_Pointers 3 98.02
0344 Reverse String Easy String, Two_Pointers, Recursion, Algorithm_I_Day_4_Two_Pointers, Udemy_Strings 1 99.91
0343 Integer Break Medium Dynamic_Programming, Math, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_21 0 100.00
0342 Power of Four Easy Math, Bit_Manipulation, Recursion 1 100.00
0341 Flatten Nested List Iterator Medium Depth_First_Search, Tree, Stack, Design, Queue, Iterator, Programming_Skills_II_Day_18 2 99.95
0338 Counting Bits Easy Dynamic_Programming, Bit_Manipulation, Udemy_Bit_Manipulation, Big_O_Time_O(num)_Space_O(num) 2 96.37
0337 House Robber III Medium Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue 1 91.77
0336 Palindrome Pairs Hard Array, String, Hash_Table, Trie 1165 57.51
0335 Self Crossing Hard Array, Math, Geometry 5 79.38
0334 Increasing Triplet Subsequence Medium Array, Greedy, Data_Structure_II_Day_5_Array 2 99.33
0332 Reconstruct Itinerary Hard Depth_First_Search, Graph, Eulerian_Circuit 4 100.00
0331 Verify Preorder Serialization of a Binary Tree Medium String, Tree, Binary_Tree, Stack 2 99.12
0330 Patching Array Hard Array, Greedy 1 60.00
0329 Longest Increasing Path in a Matrix Hard Dynamic_Programming, Depth_First_Search, Breadth_First_Search, Graph, Memoization, Topological_Sort 8 97.60
0328 Odd Even Linked List Medium Linked_List, Level_2_Day_4_Linked_List, Udemy_Linked_List 0 100.00
0327 Count of Range Sum Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 111 66.02
0326 Power of Three Easy Math, Recursion 18 85.35
0324 Wiggle Sort II Medium Array, Sorting, Divide_and_Conquer, Quickselect 4 93.22
0322 Coin Change Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_20, Level_2_Day_12_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(amount) 12 92.59
0321 Create Maximum Number Hard Greedy, Stack, Monotonic_Stack 11 93.20
0319 Bulb Switcher Medium Math, Brainteaser 0 100.00
0318 Maximum Product of Word Lengths Medium Array, String, Bit_Manipulation 12 74.92
0316 Remove Duplicate Letters Medium String, Greedy, Stack, Monotonic_Stack 3 92.27
0315 Count of Smaller Numbers After Self Hard Array, Binary_Search, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Merge_Sort 36 98.63
0313 Super Ugly Number Medium Array, Dynamic_Programming, Math 16 96.57
0312 Burst Balloons Hard Array, Dynamic_Programming 50 89.02
0310 Minimum Height Trees Medium Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort 25 93.99
0309 Best Time to Buy and Sell Stock with Cooldown Medium Array, Dynamic_Programming, Dynamic_Programming_I_Day_8 0 100.00
0307 Range Sum Query - Mutable Medium Array, Design, Segment_Tree, Binary_Indexed_Tree 92 90.27
0306 Additive Number Medium String, Backtracking 2 71.98
0304 Range Sum Query 2D - Immutable Medium Array, Matrix, Design, Prefix_Sum, Dynamic_Programming_I_Day_14, Programming_Skills_II_Day_13, Udemy_2D_Arrays/Matrix 153 87.51
0303 Range Sum Query - Immutable Easy Array, Design, Prefix_Sum, Programming_Skills_I_Day_12_Class_and_Object 7 100.00
0301 Remove Invalid Parentheses Hard String, Breadth_First_Search, Backtracking 3 91.59
0300 Longest Increasing Subsequence Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Binary_Search, Algorithm_II_Day_16_Dynamic_Programming, Binary_Search_II_Day_3, Dynamic_Programming_I_Day_18, Udemy_Dynamic_Programming, Big_O_Time_O(n*log_n)_Space_O(n) 3 95.75
0299 Bulls and Cows Medium String, Hash_Table, Counting, Level_1_Day_13_Hashmap 6 86.69
0297 Serialize and Deserialize Binary Tree Hard String, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Design, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue 7 98.13
0295 Find Median from Data Stream Hard Top_100_Liked_Questions, Sorting, Two_Pointers, Design, Heap_Priority_Queue, Data_Stream, Big_O_Time_O(n*log_n)_Space_O(n) 83 99.56
0292 Nim Game Easy Math, Game_Theory, Brainteaser 0 100.00
0290 Word Pattern Easy String, Hash_Table, Data_Structure_II_Day_7_String 1 97.26
0289 Game of Life Medium Array, Matrix, Simulation 0 100.00
0287 Find the Duplicate Number Medium Top_100_Liked_Questions, Array, Binary_Search, Two_Pointers, Bit_Manipulation, Binary_Search_II_Day_5, Big_O_Time_O(n)_Space_O(n) 2 97.52
0284 Peeking Iterator Medium Array, Design, Iterator 6 72.91
0283 Move Zeroes Easy Top_100_Liked_Questions, Array, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Programming_Skills_I_Day_6_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 2 83.99
0282 Expression Add Operators Hard String, Math, Backtracking 9 98.48
0279 Perfect Squares Medium Dynamic_Programming, Math, Breadth_First_Search, Dynamic_Programming_I_Day_21 1 100.00
0278 First Bad Version Easy Binary_Search, Interactive, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_5, Level_1_Day_7_Binary_Search 15 87.89
0275 H-Index II Medium Array, Binary_Search, Binary_Search_II_Day_8 0 100.00
0274 H-Index Medium Array, Sorting, Counting_Sort 0 100.00
0273 Integer to English Words Hard String, Math, Recursion, Udemy_Strings 3 95.67
0268 Missing Number Easy Array, Hash_Table, Math, Sorting, Binary_Search, Bit_Manipulation 1 72.07
0264 Ugly Number II Medium Hash_Table, Dynamic_Programming, Math, Heap_Priority_Queue, Dynamic_Programming_I_Day_11 2 99.91
0263 Ugly Number Easy Math 2 65.06
0262 Trips and Users Hard Database 420 95.80
0260 Single Number III Medium Array, Bit_Manipulation 1 100.00
0258 Add Digits Easy Math, Simulation, Number_Theory 1 100.00
0257 Binary Tree Paths Easy String, Depth_First_Search, Tree, Binary_Tree, Backtracking 2 93.02
0242 Valid Anagram Easy String, Hash_Table, Sorting, Data_Structure_I_Day_6_String, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Strings 2 99.01
0241 Different Ways to Add Parentheses Medium String, Dynamic_Programming, Math, Recursion, Memoization 3 70.81
0240 Search a 2D Matrix II Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Divide_and_Conquer, Data_Structure_II_Day_4_Array, Binary_Search_II_Day_8, Big_O_Time_O(n+m)_Space_O(1) 5 99.92
0239 Sliding Window Maximum Hard Top_100_Liked_Questions, Array, Heap_Priority_Queue, Sliding_Window, Queue, Monotonic_Queue, Udemy_Arrays, Big_O_Time_O(n*k)_Space_O(n+k) 26 95.89
0238 Product of Array Except Self Medium Top_100_Liked_Questions, Array, Prefix_Sum, Data_Structure_II_Day_5_Array, Udemy_Arrays, Big_O_Time_O(n^2)_Space_O(n) 1 99.66
0237 Delete Node in a Linked List Medium Linked_List 0 100.00
0236 Lowest Common Ancestor of a Binary Tree Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_18_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 6 100.00
0235 Lowest Common Ancestor of a Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree 4 100.00
0234 Palindrome Linked List Easy Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Level_2_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1) 4 84.46
0233 Number of Digit One Hard Dynamic_Programming, Math, Recursion 0 100.00
0232 Implement Queue using Stacks Easy Stack, Design, Queue, Data_Structure_I_Day_9_Stack_Queue, Programming_Skills_I_Day_11_Containers_and_Libraries, Level_2_Day_16_Design 1 67.21
0231 Power of Two Easy Math, Bit_Manipulation, Recursion, Algorithm_I_Day_13_Bit_Manipulation 1 100.00
0230 Kth Smallest Element in a BST Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_II_Day_17_Tree, Level_2_Day_9_Binary_Search_Tree, Big_O_Time_O(n)_Space_O(n) 0 100.00
0229 Majority Element II Medium Array, Hash_Table, Sorting, Counting 2 92.96
0228 Summary Ranges Easy Array 0 100.00
0227 Basic Calculator II Medium String, Math, Stack, Level_2_Day_18_Stack 8 95.32
0226 Invert Binary Tree Easy Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 0 100.00
0225 Implement Stack using Queues Easy Stack, Design, Queue 0 100.00
0224 Basic Calculator Hard String, Math, Stack, Recursion 3 98.92
0223 Rectangle Area Medium Math, Geometry 4 65.35
0222 Count Complete Tree Nodes Easy Depth_First_Search, Tree, Binary_Search, Binary_Tree, Binary_Search_II_Day_10 0 100.00
0221 Maximal Square Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Big_O_Time_O(m*n)_Space_O(m*n) 6 97.07
0220 Contains Duplicate III Hard Array, Sorting, Sliding_Window, Ordered_Set, Bucket_Sort 38 80.90
0219 Contains Duplicate II Easy Array, Hash_Table, Sliding_Window 15 99.09
0218 The Skyline Problem Hard Array, Heap_Priority_Queue, Ordered_Set, Divide_and_Conquer, Segment_Tree, Binary_Indexed_Tree, Line_Sweep 22 76.93
0217 Contains Duplicate Easy Top_Interview_Questions, Array, Hash_Table, Sorting, Data_Structure_I_Day_1_Array, Programming_Skills_I_Day_11_Containers_and_Libraries, Udemy_Arrays 6 96.68
0216 Combination Sum III Medium Array, Backtracking, Udemy_Backtracking/Recursion 1 81.35
0215 Kth Largest Element in an Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Heap_Priority_Queue, Divide_and_Conquer, Quickselect, Data_Structure_II_Day_20_Heap_Priority_Queue, Big_O_Time_O(n*log(n))_Space_O(log(n)) 5 70.82
0214 Shortest Palindrome Hard String, Hash_Function, String_Matching, Rolling_Hash 3 96.59
0213 House Robber II Medium Array, Dynamic_Programming, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Udemy_Dynamic_Programming 0 100.00
0212 Word Search II Hard Top_Interview_Questions, Array, String, Matrix, Backtracking, Trie 21 99.42
0211 Design Add and Search Words Data Structure Medium String, Depth_First_Search, Design, Trie 308 99.46
0210 Course Schedule II Medium Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Level_2_Day_11_Graph/BFS/DFS 13 35.17
0209 Minimum Size Subarray Sum Medium Array, Binary_Search, Prefix_Sum, Sliding_Window, Algorithm_II_Day_5_Sliding_Window, Binary_Search_II_Day_1 1 100.00
0208 Implement Trie (Prefix Tree) Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Design, Trie, Level_2_Day_16_Design, Udemy_Trie_and_Heap, Big_O_Time_O(word.length())_or_O(prefix.length())_Space_O(N) 32 95.05
0207 Course Schedule Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Graph, Topological_Sort, Big_O_Time_O(N)_Space_O(N) 3 99.99
0206 Reverse Linked List Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_8_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00
0205 Isomorphic Strings Easy String, Hash_Table, Level_1_Day_2_String 2 99.97
0204 Count Primes Medium Top_Interview_Questions, Array, Math, Enumeration, Number_Theory 115 92.82
0203 Remove Linked List Elements Easy Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List 1 98.82
0202 Happy Number Easy Top_Interview_Questions, Hash_Table, Math, Two_Pointers, Algorithm_II_Day_21_Others, Programming_Skills_I_Day_4_Loop, Level_2_Day_1_Implementation/Simulation 1 98.59
0201 Bitwise AND of Numbers Range Medium Bit_Manipulation, Algorithm_II_Day_19_Bit_Manipulation 8 74.15
0200 Number of Islands Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_6_Breadth_First_Search_Depth_First_Search, Graph_Theory_I_Day_1_Matrix_Related_Problems, Level_1_Day_9_Graph/BFS/DFS, Udemy_Graph, Big_O_Time_O(M*N)_Space_O(M*N) 3 87.24
0199 Binary Tree Right Side View Medium Top_100_Liked_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_16_Tree, Level_2_Day_15_Tree 1 94.57
0198 House Robber Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_3, Level_2_Day_12_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 0 100.00
0197 Rising Temperature Easy Database, SQL_I_Day_6_Union 342 93.76
0196 Delete Duplicate Emails Easy Database, SQL_I_Day_2_Select_and_Order 903 48.10
0195 Tenth Line Easy Shell 26 99.36
0194 Transpose File Medium Shell 630 28.43
0193 Valid Phone Numbers Easy Shell 112 75.54
0192 Word Frequency Medium Shell 143 54.55
0191 Number of 1 Bits Easy Top_Interview_Questions, Bit_Manipulation, Algorithm_I_Day_13_Bit_Manipulation, Programming_Skills_I_Day_2_Operator, Udemy_Bit_Manipulation 1 84.87
0190 Reverse Bits Easy Top_Interview_Questions, Bit_Manipulation, Divide_and_Conquer, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Bit_Manipulation 1 98.66
0189 Rotate Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Two_Pointers, Algorithm_I_Day_2_Two_Pointers, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 0 100.00
0188 Best Time to Buy and Sell Stock IV Hard Array, Dynamic_Programming 1 100.00
0187 Repeated DNA Sequences Medium String, Hash_Table, Bit_Manipulation, Sliding_Window, Hash_Function, Rolling_Hash, Data_Structure_II_Day_9_String, Udemy_Strings 29 77.11
0185 Department Top Three Salaries Hard Database 643 95.52
0184 Department Highest Salary Medium Database 590 73.49
0183 Customers Who Never Order Easy Database, SQL_I_Day_1_Select 376 98.73
0182 Duplicate Emails Easy Database, SQL_I_Day_10_Where 303 92.08
0181 Employees Earning More Than Their Managers Easy Database 315 94.44
0180 Consecutive Numbers Medium Database 469 89.19
0179 Largest Number Medium Top_Interview_Questions, String, Sorting, Greedy 10 54.50
0178 Rank Scores Medium Database 290 66.73
0177 Nth Highest Salary Medium Database 342 71.87
0176 Second Highest Salary Medium Database, SQL_I_Day_4_Union_and_Select 225 73.10
0175 Combine Two Tables Easy Database, SQL_I_Day_5_Union 491 32.30
0174 Dungeon Game Hard Array, Dynamic_Programming, Matrix 0 100.00
0173 Binary Search Tree Iterator Medium Tree, Binary_Tree, Stack, Design, Binary_Search_Tree, Iterator, Data_Structure_II_Day_17_Tree, Programming_Skills_II_Day_16, Level_2_Day_9_Binary_Search_Tree 18 84.18
0172 Factorial Trailing Zeroes Medium Top_Interview_Questions, Math, Udemy_Integers 1 85.61
0171 Excel Sheet Column Number Easy Top_Interview_Questions, String, Math 2 76.43
0169 Majority Element Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Sorting, Counting, Divide_and_Conquer, Data_Structure_II_Day_1_Array, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1) 1 99.89
0168 Excel Sheet Column Title Easy String, Math 0 100.00
0167 Two Sum II - Input Array Is Sorted Medium Array, Binary_Search, Two_Pointers, Algorithm_I_Day_3_Two_Pointers, Binary_Search_I_Day_7 1 99.21
0166 Fraction to Recurring Decimal Medium Top_Interview_Questions, String, Hash_Table, Math 3 55.19
0165 Compare Version Numbers Medium String, Two_Pointers 1 88.88
0164 Maximum Gap Medium Array, Sorting, Bucket_Sort, Radix_Sort 48 53.59
0162 Find Peak Element Medium Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_II_Day_12 0 100.00
0160 Intersection of Two Linked Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Udemy_Linked_List, Big_O_Time_O(M+N)_Space_O(1) 1 99.92
0155 Min Stack Medium Top_100_Liked_Questions, Top_Interview_Questions, Stack, Design, Data_Structure_II_Day_14_Stack_Queue, Programming_Skills_II_Day_18, Level_2_Day_16_Design, Udemy_Design, Big_O_Time_O(1)_Space_O(N) 4 96.54
0154 Find Minimum in Rotated Sorted Array II Hard Array, Binary_Search, Binary_Search_II_Day_13 1 77.09
0153 Find Minimum in Rotated Sorted Array Medium Top_100_Liked_Questions, Array, Binary_Search, Algorithm_II_Day_2_Binary_Search, Binary_Search_I_Day_12, Udemy_Binary_Search, Big_O_Time_O(log_N)_Space_O(log_N) 0 100.00
0152 Maximum Product Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Dynamic_Programming_I_Day_6, Level_2_Day_13_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(N)_Space_O(1) 1 92.74
0151 Reverse Words in a String Medium String, Two_Pointers, Udemy_Strings 2 99.94
0150 Evaluate Reverse Polish Notation Medium Top_Interview_Questions, Array, Math, Stack, Programming_Skills_II_Day_3 9 51.23
0149 Max Points on a Line Hard Top_Interview_Questions, Array, Hash_Table, Math, Geometry, Algorithm_II_Day_21_Others 11 99.21
0148 Sort List Medium Top_100_Liked_Questions, Top_Interview_Questions, Sorting, Two_Pointers, Linked_List, Divide_and_Conquer, Merge_Sort, Level_2_Day_4_Linked_List, Big_O_Time_O(log(N))_Space_O(log(N)) 9 93.90
0147 Insertion Sort List Medium Sorting, Linked_List 4 90.34
0146 LRU Cache Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Design, Linked_List, Doubly_Linked_List, Udemy_Linked_List, Big_O_Time_O(1)_Space_O(capacity) 40 98.20
0145 Binary Tree Postorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue 1 49.11
0144 Binary Tree Preorder Traversal Easy Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue 1 48.38
0143 Reorder List Medium Two_Pointers, Stack, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Programming_Skills_II_Day_14 2 72.59
0142 Linked List Cycle II Medium Top_100_Liked_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_II_Day_10_Linked_List, Level_1_Day_4_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00
0141 Linked List Cycle Easy Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Two_Pointers, Linked_List, Data_Structure_I_Day_7_Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(1) 0 100.00
0140 Word Break II Hard Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Backtracking, Trie, Memoization 1 99.05
0139 Word Break Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Dynamic_Programming, Trie, Memoization, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_9, Udemy_Dynamic_Programming, Big_O_Time_O(M+max*N)_Space_O(M+N+max) 1 99.42
0138 Copy List with Random Pointer Medium Top_100_Liked_Questions, Top_Interview_Questions, Hash_Table, Linked_List, Programming_Skills_II_Day_14, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(N) 0 100.00
0137 Single Number II Medium Array, Bit_Manipulation 0 100.00
0136 Single Number Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Data_Structure_II_Day_1_Array, Algorithm_I_Day_14_Bit_Manipulation, Udemy_Integers, Big_O_Time_O(N)_Space_O(1) 1 99.86
0135 Candy Hard Array, Greedy 2 99.95
0134 Gas Station Medium Top_Interview_Questions, Array, Greedy 2 94.26
0133 Clone Graph Medium Hash_Table, Depth_First_Search, Breadth_First_Search, Graph, Udemy_Graph 45 29.80
0132 Palindrome Partitioning II Hard String, Dynamic_Programming 2 99.89
0131 Palindrome Partitioning Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Big_O_Time_O(N*2^N)_Space_O(2^N*N) 7 98.55
0130 Surrounded Regions Medium Top_Interview_Questions, Array, Depth_First_Search, Breadth_First_Search, Matrix, Union_Find, Algorithm_II_Day_8_Breadth_First_Search_Depth_First_Search 2 84.66
0129 Sum Root to Leaf Numbers Medium Depth_First_Search, Tree, Binary_Tree 0 100.00
0128 Longest Consecutive Sequence Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Union_Find, Big_O_Time_O(N_log_N)_Space_O(1) 14 98.89
0127 Word Ladder Hard Top_Interview_Questions, String, Hash_Table, Breadth_First_Search, Graph_Theory_I_Day_12_Breadth_First_Search 37 94.58
0126 Word Ladder II Hard String, Hash_Table, Breadth_First_Search, Backtracking 19 60.53
0125 Valid Palindrome Easy Top_Interview_Questions, String, Two_Pointers, Udemy_Two_Pointers 3 98.64
0124 Binary Tree Maximum Path Sum Hard Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Depth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(N) 0 100.00
0123 Best Time to Buy and Sell Stock III Hard Array, Dynamic_Programming 4 87.18
0122 Best Time to Buy and Sell Stock II Medium Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Dynamic_Programming_I_Day_7, Udemy_Arrays 1 96.82
0121 Best Time to Buy and Sell Stock Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_3_Array, Dynamic_Programming_I_Day_7, Level_1_Day_5_Greedy, Udemy_Arrays, Big_O_Time_O(N)_Space_O(1) 1 99.78
0120 Triangle Medium Array, Dynamic_Programming, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_13, Udemy_Dynamic_Programming 2 94.63
0119 Pascal’s Triangle II Easy Array, Dynamic_Programming, Data_Structure_II_Day_3_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming 0 100.00
0118 Pascal’s Triangle Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Data_Structure_I_Day_4_Array, Dynamic_Programming_I_Day_12, Udemy_Dynamic_Programming 1 67.08
0117 Populating Next Right Pointers in Each Node II Medium Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_II_Day_7_Breadth_First_Search_Depth_First_Search 0 100.00
0116 Populating Next Right Pointers in Each Node Medium Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Linked_List, Algorithm_I_Day_8_Breadth_First_Search_Depth_First_Search 0 100.00
0115 Distinct Subsequences Hard String, Dynamic_Programming 2 100.00
0114 Flatten Binary Tree to Linked List Medium Top_100_Liked_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Linked_List, Udemy_Linked_List, Big_O_Time_O(N)_Space_O(N) 0 100.00
0113 Path Sum II Medium Depth_First_Search, Tree, Binary_Tree, Backtracking, Data_Structure_II_Day_16_Tree 1 100.00
0112 Path Sum Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_12_Tree 0 100.00
0111 Minimum Depth of Binary Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Udemy_Tree_Stack_Queue 1 97.49
0110 Balanced Binary Tree Easy Depth_First_Search, Tree, Binary_Tree, Programming_Skills_II_Day_2, Level_2_Day_6_Tree, Udemy_Tree_Stack_Queue 1 98.82
0109 Convert Sorted List to Binary Search Tree Medium Tree, Binary_Tree, Linked_List, Binary_Search_Tree, Divide_and_Conquer 1 87.04
0108 Convert Sorted Array to Binary Search Tree Easy Top_Interview_Questions, Array, Tree, Binary_Tree, Binary_Search_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Level_2_Day_9_Binary_Search_Tree, Udemy_Tree_Stack_Queue 0 100.00
0107 Binary Tree Level Order Traversal II Medium Breadth_First_Search, Tree, Binary_Tree 1 97.71
0106 Construct Binary Tree from Inorder and Postorder Traversal Medium Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer 1 100.00
0105 Construct Binary Tree from Preorder and Inorder Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Tree, Binary_Tree, Divide_and_Conquer, Data_Structure_II_Day_15_Tree, Big_O_Time_O(N)_Space_O(N) 1 96.33
0104 Maximum Depth of Binary Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Programming_Skills_I_Day_10_Linked_List_and_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(H) 0 100.00
0103 Binary Tree Zigzag Level Order Traversal Medium Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_II_Day_15_Tree, Udemy_Tree_Stack_Queue 1 95.00
0102 Binary Tree Level Order Traversal Medium Top_100_Liked_Questions, Top_Interview_Questions, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_1_Day_6_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(N) 1 91.19
0101 Symmetric Tree Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Data_Structure_I_Day_11_Tree, Level_2_Day_15_Tree, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00
0100 Same Tree Easy Depth_First_Search, Breadth_First_Search, Tree, Binary_Tree, Level_2_Day_15_Tree, Udemy_Tree_Stack_Queue 0 100.00
0099 Recover Binary Search Tree Medium Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree 3 76.33
0098 Validate Binary Search Tree Medium Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Binary_Search_Tree, Data_Structure_I_Day_14_Tree, Level_1_Day_8_Binary_Search_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(N)_Space_O(log(N)) 0 100.00
0097 Interleaving String Medium String, Dynamic_Programming 2 88.01
0096 Unique Binary Search Trees Medium Dynamic_Programming, Math, Tree, Binary_Tree, Binary_Search_Tree, Dynamic_Programming_I_Day_11, Big_O_Time_O(n)_Space_O(1) 0 100.00
0095 Unique Binary Search Trees II Medium Dynamic_Programming, Tree, Binary_Tree, Backtracking, Binary_Search_Tree 1 99.82
0094 Binary Tree Inorder Traversal Easy Top_100_Liked_Questions, Top_Interview_Questions, Depth_First_Search, Tree, Binary_Tree, Stack, Data_Structure_I_Day_10_Tree, Udemy_Tree_Stack_Queue, Big_O_Time_O(n)_Space_O(n) 0 100.00
0093 Restore IP Addresses Medium String, Backtracking 1 99.27
0092 Reverse Linked List II Medium Linked_List 0 100.00
0091 Decode Ways Medium Top_Interview_Questions, String, Dynamic_Programming, Algorithm_II_Day_15_Dynamic_Programming, Dynamic_Programming_I_Day_10 2 66.37
0090 Subsets II Medium Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking 2 82.94
0089 Gray Code Medium Math, Bit_Manipulation, Backtracking 3 98.59
0088 Merge Sorted Array Easy Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_I_Day_2_Array 0 100.00
0087 Scramble String Hard String, Dynamic_Programming 16 70.62
0086 Partition List Medium Two_Pointers, Linked_List 1 62.66
0085 Maximal Rectangle Hard Array, Dynamic_Programming, Matrix, Stack, Monotonic_Stack 3 99.68
0084 Largest Rectangle in Histogram Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Stack, Monotonic_Stack, Big_O_Time_O(n_log_n)_Space_O(log_n) 9 93.28
0083 Remove Duplicates from Sorted List Easy Linked_List, Data_Structure_I_Day_8_Linked_List 0 100.00
0082 Remove Duplicates from Sorted List II Medium Two_Pointers, Linked_List, Data_Structure_II_Day_11_Linked_List, Algorithm_II_Day_3_Two_Pointers 0 100.00
0081 Search in Rotated Sorted Array II Medium Array, Binary_Search, Binary_Search_II_Day_12 1 82.83
0080 Remove Duplicates from Sorted Array II Medium Array, Two_Pointers, Udemy_Arrays 0 100.00
0079 Word Search Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Big_O_Time_O(4^(m*n))_Space_O(m*n) 64 98.51
0078 Subsets Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Bit_Manipulation, Backtracking, Algorithm_II_Day_9_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n*2^n) 0 100.00
0077 Combinations Medium Backtracking, Algorithm_I_Day_11_Recursion_Backtracking 11 77.40
0076 Minimum Window Substring Hard Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Big_O_Time_O(s.length())_Space_O(1) 2 99.83
0075 Sort Colors Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_2_Array, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 0 100.00
0074 Search a 2D Matrix Medium Top_100_Liked_Questions, Array, Binary_Search, Matrix, Data_Structure_I_Day_5_Array, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_8, Level_2_Day_8_Binary_Search, Udemy_2D_Arrays/Matrix, Big_O_Time_O(endRow+endCol)_Space_O(1) 0 100.00
0073 Set Matrix Zeroes Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Matrix, Udemy_2D_Arrays/Matrix, Big_O_Time_O(m*n)_Space_O(1) 0 100.00
0072 Edit Distance Medium Top_100_Liked_Questions, String, Dynamic_Programming, Algorithm_II_Day_18_Dynamic_Programming, Dynamic_Programming_I_Day_19, Udemy_Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2) 3 97.19
0071 Simplify Path Medium String, Stack 2 99.80
0070 Climbing Stairs Easy Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Memoization, Algorithm_I_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_2, Level_1_Day_10_Dynamic_Programming, Udemy_Dynamic_Programming, Big_O_Time_O(n)_Space_O(n) 0 100.00
0069 Sqrt(x) Easy Top_Interview_Questions, Math, Binary_Search, Binary_Search_I_Day_4 1 99.51
0068 Text Justification Hard Array, String, Simulation 0 100.00
0067 Add Binary Easy String, Math, Bit_Manipulation, Simulation, Programming_Skills_II_Day_5 1 100.00
0066 Plus One Easy Top_Interview_Questions, Array, Math, Programming_Skills_II_Day_3, Udemy_Arrays 0 100.00
0065 Valid Number Hard String 1 100.00
0064 Minimum Path Sum Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_16, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n) 1 99.73
0063 Unique Paths II Medium Array, Dynamic_Programming, Matrix, Dynamic_Programming_I_Day_15 0 100.00
0062 Unique Paths Medium Top_100_Liked_Questions, Top_Interview_Questions, Dynamic_Programming, Math, Combinatorics, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_15, Level_1_Day_11_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n) 0 100.00
0061 Rotate List Medium Two_Pointers, Linked_List, Programming_Skills_II_Day_16, Udemy_Linked_List 0 100.00
0060 Permutation Sequence Hard Math, Recursion 0 100.00
0059 Spiral Matrix II Medium Array, Matrix, Simulation, Data_Structure_II_Day_3_Array 0 100.00
0058 Length of Last Word Easy String, Programming_Skills_II_Day_6, Udemy_Arrays 0 100.00
0057 Insert Interval Medium Array, Level_2_Day_17_Interval 0 100.00
0056 Merge Intervals Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Data_Structure_II_Day_2_Array, Level_2_Day_17_Interval, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n_log_n)_Space_O(n) 7 98.37
0055 Jump Game Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_12_Dynamic_Programming, Dynamic_Programming_I_Day_4, Udemy_Arrays, Big_O_Time_O(n)_Space_O(1) 1 100.00
0054 Spiral Matrix Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Matrix, Simulation, Programming_Skills_II_Day_8, Level_2_Day_1_Implementation/Simulation, Udemy_2D_Arrays/Matrix 0 100.00
0053 Maximum Subarray Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Divide_and_Conquer, Data_Structure_I_Day_1_Array, Dynamic_Programming_I_Day_5, Udemy_Famous_Algorithm, Big_O_Time_O(n)_Space_O(1) 1 99.32
0052 N-Queens II Hard Backtracking 1 96.99
0051 N-Queens Hard Top_100_Liked_Questions, Array, Backtracking, Big_O_Time_O(N!)_Space_O(N) 1 99.77
0050 Pow(x, n) Medium Top_Interview_Questions, Math, Recursion, Udemy_Integers 0 100.00
0049 Group Anagrams Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, String, Hash_Table, Sorting, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_11, Udemy_Strings, Big_O_Time_O(n*k_log_k)_Space_O(n) 6 97.61
0048 Rotate Image Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Math, Matrix, Data_Structure_II_Day_3_Array, Programming_Skills_II_Day_7, Udemy_2D_Arrays/Matrix, Big_O_Time_O(n^2)_Space_O(1) 0 100.00
0047 Permutations II Medium Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 1 99.86
0046 Permutations Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Backtracking, Algorithm_I_Day_11_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(n*n!)_Space_O(n+n!) 1 94.08
0045 Jump Game II Medium Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Algorithm_II_Day_13_Dynamic_Programming, Dynamic_Programming_I_Day_4, Big_O_Time_O(n)_Space_O(1) 0 100.00
0044 Wildcard Matching Hard Top_Interview_Questions, String, Dynamic_Programming, Greedy, Recursion, Udemy_Dynamic_Programming 2 99.87
0043 Multiply Strings Medium String, Math, Simulation, Data_Structure_II_Day_8_String, Programming_Skills_II_Day_4, Level_2_Day_2_String 1 100.00
0042 Trapping Rain Water Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Two_Pointers, Stack, Monotonic_Stack, Dynamic_Programming_I_Day_9, Udemy_Two_Pointers, Big_O_Time_O(n)_Space_O(1) 0 100.00
0041 First Missing Positive Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n) 1 100.00
0040 Combination Sum II Medium Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking 2 99.75
0039 Combination Sum Medium Top_100_Liked_Questions, Array, Backtracking, Algorithm_II_Day_10_Recursion_Backtracking, Level_2_Day_20_Brute_Force/Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n+2^n) 1 99.99
0038 Count and Say Medium Top_Interview_Questions, String 2 97.68
0037 Sudoku Solver Hard Array, Matrix, Backtracking 2 99.55
0036 Valid Sudoku Medium Top_Interview_Questions, Array, Hash_Table, Matrix, Data_Structure_I_Day_5_Array 1 100.00
0035 Search Insert Position Easy Top_100_Liked_Questions, Array, Binary_Search, Algorithm_I_Day_1_Binary_Search, Binary_Search_I_Day_2, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0034 Find First and Last Position of Element in Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_5, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0033 Search in Rotated Sorted Array Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Algorithm_II_Day_1_Binary_Search, Binary_Search_I_Day_11, Level_2_Day_8_Binary_Search, Udemy_Binary_Search, Big_O_Time_O(log_n)_Space_O(1) 0 100.00
0032 Longest Valid Parentheses Hard Top_100_Liked_Questions, String, Dynamic_Programming, Stack, Big_O_Time_O(n)_Space_O(1) 1 99.74
0031 Next Permutation Medium Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1) 0 100.00
0030 Substring with Concatenation of All Words Hard String, Hash_Table, Sliding_Window 1472 34.43
0029 Divide Two Integers Medium Top_Interview_Questions, Math, Bit_Manipulation, Udemy_Bit_Manipulation 1 97.44
0028 Implement strStr() Easy Top_Interview_Questions, String, Two_Pointers, String_Matching, Programming_Skills_II_Day_1 0 100.00
0027 Remove Element Easy Array, Two_Pointers 0 100.00
0026 Remove Duplicates from Sorted Array Easy Top_Interview_Questions, Array, Two_Pointers, Udemy_Two_Pointers 1 98.56
0025 Reverse Nodes in k-Group Hard Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_13_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(k) 0 100.00
0024 Swap Nodes in Pairs Medium Top_100_Liked_Questions, Linked_List, Recursion, Data_Structure_II_Day_12_Linked_List, Udemy_Linked_List, Big_O_Time_O(n)_Space_O(1) 0 100.00
0023 Merge k Sorted Lists Hard Top_100_Liked_Questions, Top_Interview_Questions, Heap_Priority_Queue, Linked_List, Divide_and_Conquer, Merge_Sort, Big_O_Time_O(k*n*log(k))_Space_O(log(k)) 1 99.86
0022 Generate Parentheses Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(2^n)_Space_O(n) 0 100.00
0021 Merge Two Sorted Lists Easy Top_100_Liked_Questions, Top_Interview_Questions, Linked_List, Recursion, Data_Structure_I_Day_7_Linked_List, Algorithm_I_Day_10_Recursion_Backtracking, Level_1_Day_3_Linked_List, Udemy_Linked_List, Big_O_Time_O(m+n)_Space_O(m+n) 0 100.00
0020 Valid Parentheses Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Data_Structure_I_Day_9_Stack_Queue, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) 2 97.19
0019 Remove Nth Node From End of List Medium Top_100_Liked_Questions, Top_Interview_Questions, Two_Pointers, Linked_List, Algorithm_I_Day_5_Two_Pointers, Level_2_Day_3_Linked_List, Big_O_Time_O(L)_Space_O(L) 0 100.00
0018 4Sum Medium Array, Sorting, Two_Pointers 3 99.69
0017 Letter Combinations of a Phone Number Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Backtracking, Algorithm_II_Day_11_Recursion_Backtracking, Udemy_Backtracking/Recursion, Big_O_Time_O(4^n)_Space_O(n) 0 100.00
0016 3Sum Closest Medium Array, Sorting, Two_Pointers, Level_2_Day_14_Sliding_Window/Two_Pointer 4 98.21
0015 3Sum Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Two_Pointers, Data_Structure_II_Day_1_Array, Algorithm_II_Day_3_Two_Pointers, Udemy_Two_Pointers, Big_O_Time_O(n*log(n))_Space_O(n^2) 29 72.02
0014 Longest Common Prefix Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Level_2_Day_2_String, Udemy_Strings 0 100.00
0013 Roman to Integer Easy Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Math 2 100.00
0012 Integer to Roman Medium String, Hash_Table, Math 2 100.00
0011 Container With Most Water Medium Top_100_Liked_Questions, Top_Interview_Questions, Array, Greedy, Two_Pointers, Algorithm_II_Day_4_Two_Pointers, Big_O_Time_O(n)_Space_O(1) 3 96.01
0010 Regular Expression Matching Hard Top_Interview_Questions, String, Dynamic_Programming, Recursion, Udemy_Dynamic_Programming, Big_O_Time_O(m*n)_Space_O(m*n) 1 100.00
0009 Palindrome Number Easy Math, Udemy_Integers 4 100.00
0008 String to Integer (atoi) Medium Top_Interview_Questions, String 1 100.00
0007 Reverse Integer Medium Top_Interview_Questions, Math, Udemy_Integers 0 100.00
0006 Zigzag Conversion Medium String 2 99.71
0005 Longest Palindromic Substring Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Data_Structure_II_Day_9_String, Algorithm_II_Day_14_Dynamic_Programming, Dynamic_Programming_I_Day_17, Udemy_Strings, Big_O_Time_O(n)_Space_O(n) 7 97.82
0004 Median of Two Sorted Arrays Hard Top_100_Liked_Questions, Top_Interview_Questions, Array, Binary_Search, Divide_and_Conquer, Big_O_Time_O(log(min(N,M)))_Space_O(1), AI_can_be_used_to_solve_the_task 1 100.00
0003 Longest Substring Without Repeating Characters Medium Top_100_Liked_Questions, Top_Interview_Questions, String, Hash_Table, Sliding_Window, Algorithm_I_Day_6_Sliding_Window, Level_2_Day_14_Sliding_Window/Two_Pointer, Udemy_Strings, Big_O_Time_O(n)_Space_O(1), AI_can_be_used_to_solve_the_task 2 98.59
0002 Add Two Numbers Medium Top_100_Liked_Questions, Top_Interview_Questions, Math, Linked_List, Recursion, Data_Structure_II_Day_10_Linked_List, Programming_Skills_II_Day_15, Big_O_Time_O(max(N,M))_Space_O(max(N,M)), AI_can_be_used_to_solve_the_task 1 100.00
0001 Two Sum Easy Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Data_Structure_I_Day_2_Array, Level_1_Day_13_Hashmap, Udemy_Arrays, Big_O_Time_O(n)_Space_O(n), AI_can_be_used_to_solve_the_task 2 98.90
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