Non-decreasing Array
Given an array nums with n integers, your task is to check if it could become non-decreasing by modifying at most one element.
We define an array is non-decreasing if nums[i] <= nums[i + 1] holds for every i (0-based) such that (0 <= i <= n - 2).
public boolean checkPossibility(int[] nums) {
int cnt = 0; //the number of changes
for(int i = 1; i < nums.length && cnt<=1 ; i++){
if(nums[i-1] > nums[i]){
cnt++;
if(i-2<0 || nums[i-2] <= nums[i])nums[i-1] = nums[i]; //modify nums[i-1] of a priority
else nums[i] = nums[i-1]; //have to modify nums[i]
}
}
return cnt<=1;
}
Related Problems
You are given an integer array nums. You are initially positioned at the array's first index, and each element in the array represents your maximum jump length at that position.
Return true if you can reach the last index, or false otherwise.
You are given an array of CPU tasks, each represented by letters A to Z, and a cooling time, n. Each cycle or interval allows the completion of one task. Tasks can be completed in any order, but there's a constraint: identical tasks must be separated by at least n intervals due to cooling time.
Return the minimum number of intervals required to complete all tasks.
You are given a 0-indexed array of integers nums of length n. You are initially positioned at nums[0].
Each element nums[i] represents the maximum length of a forward jump from index i. In other words, if you are at nums[i], you can jump to any nums[i + j] where:
0 <= j <= nums[i] and
i + j < n
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On each day, you may decide to buy and/or sell the stock. You can only hold at most one share of the stock at any time. However, you can buy it then immediately sell it on the same day.
Find and return the maximum profit you can achieve.