LeetCode-in-Java

“For coding interview preparation, LeetCode is one of the best online resource providing a rich library of more than 300 real coding interview questions for you to practice from using one of the 7 supported languages - C, C++, Java, Python, C#, JavaScript, Ruby.”

• Programming Skills II
• Graph Theory I
• SQL I
• Level 1
• Level 2
• Udemy
• Data Structure I
• Data Structure II
• Algorithm I
• Algorithm II
• Binary Search I
• Binary Search II
• Dynamic Programming I
• Programming Skills I

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)	10	94.99
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	92.28

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)	6	99.03
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))	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)	3	100.00
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

Day 1 Matrix Related Problems

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	97.76

Day 2 Matrix Related Problems

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

Day 3 Matrix Related Problems

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

Day 4 Matrix Related Problems

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

Day 5 Matrix Related Problems

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

Day 6 Matrix Related Problems

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

Day 11 Breadth First Search

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

Day 12 Breadth First Search

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	100.00
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	91.09

Day 7 Binary Search

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	97.76

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)	6	99.03
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)	2	85.97
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)	1	87.68

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)	6	76.07

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))	12	85.82

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)	1	65.86
0437	Path Sum III	Medium	Depth_First_Search, Tree, Binary_Tree, Big_O_Time_O(n)_Space_O(n)	18	45.66

Day 8 Binary Search

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)	1	78.91
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)	17	91.77

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)	27	94.53
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	0	100.00

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)	2	99.52
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	99.94

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)	3	100.00
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)	34	99.90

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)	8	96.27

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	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	95.07

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	99.97
0007	Reverse Integer	Medium	Top_Interview_Questions, Math	1	96.61
0009	Palindrome Number	Easy	Math	5	77.91
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)	2	99.52
0020	Valid Parentheses	Easy	Top_100_Liked_Questions, Top_Interview_Questions, String, Stack, Big_O_Time_O(n)_Space_O(n)	1	98.78
0005	Longest Palindromic Substring	Medium	Top_100_Liked_Questions, Top_Interview_Questions, String, Dynamic_Programming, Big_O_Time_O(n)_Space_O(n)	7	96.96
0394	Decode String	Medium	Top_100_Liked_Questions, String, Stack, Recursion, Big_O_Time_O(n)_Space_O(n)	1	87.68
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	92.28
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

Udemy Binary Search

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	100.00
0283	Move Zeroes	Easy	Top_100_Liked_Questions, Array, Two_Pointers, Big_O_Time_O(n)_Space_O(1)	2	79.54
0001	Two Sum	Easy	Top_100_Liked_Questions, Top_Interview_Questions, Array, Hash_Table, Big_O_Time_O(n)_Space_O(n)	2	85.97
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)	2	79.47
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	100.00
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)	2	57.59
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)	58	52.28

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	82.24

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	100.00
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	100.00

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)	1	79.07
0056	Merge Intervals	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Sorting, Big_O_Time_O(n_log_n)_Space_O(n)	8	96.27

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)	1	75.27
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	99.68
0234	Palindrome Linked List	Easy	Top_100_Liked_Questions, Two_Pointers, Stack, Linked_List, Recursion, Big_O_Time_O(n)_Space_O(1)	6	76.07
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)	87	50.80
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	91.09
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)	1	65.86
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)	1	99.46
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)	10	56.51
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)	34	99.90
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	97.76
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)	2	97.08
0152	Maximum Product Subarray	Medium	Top_100_Liked_Questions, Top_Interview_Questions, Array, Dynamic_Programming, Big_O_Time_O(N)_Space_O(1)	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
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)	0	100.00
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	98.63
1143	Longest Common Subsequence	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n*m)_Space_O(n*m)	33	46.23
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	4	90.13
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	100.00
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)	1	70.60
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	95.07

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	86.73
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)	3	100.00

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	100.00

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)	2	85.97
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	100.00

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)	1	98.78
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	91.09
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

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	99.97
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	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	82.24

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)	8	96.27
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)	7	86.73
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	100.00
0560	Subarray Sum Equals K	Medium	Top_100_Liked_Questions, Array, Hash_Table, Prefix_Sum, Big_O_Time_O(n)_Space_O(n)	21	98.97

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)	1	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	92.28
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	96.96

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))	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	99.68
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)	3	100.00
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)	3	86.35
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)	1	78.91
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)	10	56.51
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	97.93

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

Day 1 Binary Search

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	79.54
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)	2	99.52
0567	Permutation in String	Medium	Top_100_Liked_Questions, String, Hash_Table, Two_Pointers, Sliding_Window	5	93.93

Day 7 Breadth First Search Depth First Search

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

Day 8 Breadth First Search Depth First Search

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

Day 9 Breadth First Search Depth First Search

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	95.07
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	99.97

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

Day 2 Binary Search

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	82.24

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	95.71

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)	6	99.03
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

Day 6 Breadth First Search Depth First Search

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	97.76
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	1	100.00

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)	1	70.60
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	100.00
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)	157	78.97

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)	2	79.47

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)	2	49.02
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	96.96
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)	2	97.08

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	98.63
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)	33	46.23
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)	4	90.13
0322	Coin Change	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Breadth_First_Search, Big_O_Time_O(m*n)_Space_O(amount)	17	91.77
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	98.63
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	99.82
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)	7	86.73
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)	2	79.47
0045	Jump Game II	Medium	Top_100_Liked_Questions, Array, Dynamic_Programming, Greedy, Big_O_Time_O(n)_Space_O(1)	2	49.02

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	100.00
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)	0	100.00
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	100.00
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)	2	97.08
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)	0	100.00
0221	Maximal Square	Medium	Array, Dynamic_Programming, Matrix, Big_O_Time_O(m*n)_Space_O(m*n)	7	72.35

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	96.96
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	98.63
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)	33	46.23
0072	Edit Distance	Medium	Top_100_Liked_Questions, String, Dynamic_Programming, Big_O_Time_O(n^2)_Space_O(n2)	4	90.13

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)	17	91.77
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	79.54
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

Algorithms

#	Title	Difficulty	Tag	Time, ms	Time, %
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	192	24.16
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	433	24.83
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	4	89.77
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)	33	46.23
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	13	24.81
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	5	24.79
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)	1	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)	10	94.99
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	98.77
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	1	100.00
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)	21	98.97
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)	1	65.86
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))	9	79.99
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)	6	99.03
0437	Path Sum III	Medium	Depth_First_Search, Tree, Binary_Tree, Level_2_Day_7_Tree, Big_O_Time_O(n)_Space_O(n)	18	45.66
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)	27	94.53
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)	1	87.68
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	97.93
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	86.73
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)	17	91.77
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	98.63
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)	151	80.24
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	99.82
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	79.54
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)	7	86.73
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)	58	52.28
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	100.00
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)	10	56.51
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)	6	76.07
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)	1	78.91
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)	7	72.35
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)	34	99.90
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	97.58
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	97.76
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	550	48.44
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	100.00
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	99.68
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)	3	100.00
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)	0	100.00
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))	12	85.82
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)	87	50.80
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)	2	97.08
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	99.97
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)	16	65.63
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)	18	91.05
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)	1	99.46
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	100.00
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)	1	75.27
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)	3	86.35
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	91.09
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	13	24.23
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)	11	98.34
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)	157	78.97
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)	1	70.60
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	99.94
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)	1	79.07
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)	4	90.13
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)	0	100.00
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)	8	96.27
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)	2	79.47
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	100.00
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	100.00
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	92.28
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	95.07
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)	2	49.02
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)	2	57.59
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	100.00
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	100.00
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	100.00
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)	1	98.78
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	82.24
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	95.71
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	5	77.91
0008	String to Integer (atoi)	Medium	Top_Interview_Questions, String	1	100.00
0007	Reverse Integer	Medium	Top_Interview_Questions, Math, Udemy_Integers	1	96.61
0006	Zigzag Conversion	Medium	String	2	99.60
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	96.96
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)	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)	2	99.52
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))	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)	2	85.97

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