LeetCode-in-Java
896. Monotonic Array
Easy
An array is monotonic if it is either monotone increasing or monotone decreasing.
An array nums is monotone increasing if for all i <= j, nums[i] <= nums[j]. An array nums is monotone decreasing if for all i <= j, nums[i] >= nums[j].
Given an integer array nums, return true if the given array is monotonic, or false otherwise.
Example 1:
Input: nums = [1,2,2,3]
Output: true
Example 2:
Input: nums = [6,5,4,4]
Output: true
Example 3:
Input: nums = [1,3,2]
Output: false
Constraints:
1 <= nums.length <= 105-105 <= nums[i] <= 105
Solution
public class Solution {
public boolean isMonotonic(int[] nums) {
int i = 0;
for (; i < nums.length - 1; i++) {
if (nums[i] > nums[i + 1]) {
break;
}
}
if (i == nums.length - 1) {
return true;
}
i = 0;
for (; i < nums.length - 1; i++) {
if (nums[i] < nums[i + 1]) {
break;
}
}
return i == nums.length - 1;
}
}