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Shortest Unsorted Continuous Subarray

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Given an integer array nums, you need to find one continuous subarray such that if you only sort this subarray in non-decreasing order, then the whole array will be sorted in non-decreasing order.

Return the shortest such subarray and output its length.

class Solution {
    public int findUnsortedSubarray(int[] nums) {
        int end = -1;
        int max = nums[0];
        for(int i = 1; i < nums.length; i++){
            if(max > nums[i]){ // the left value is greater then current value
                end = i; // mark that index with end
            }
            else{
                max = nums[i];
            }
        }
        
        int start = 0;
        int min = nums[nums.length - 1];
        for(int i = nums.length - 2; i >= 0; i--){
            if(min < nums[i]){ // the right value is smaller then current value
                start = i; // mark that index with start
            }
            else{
                min = nums[i];
            }
        }
        return end - start + 1;
    }
}

Posted by Jamie Meyer 3 months ago

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