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滚动窗口问题

右指针到边界时结束，当sum>=x的时候进入判断，如果路径更短，则替换掉，之后sum减掉左指针，左指针右移，此时若sum>=x仍然成立，则继续更新并重复，如果此时不成立，则右指针右移，继续判断。

#include<iostream>
using namespace std;const int N = 1e7 + 10;
int arr[N];
int n, x;int main()
{int retlen = N, retleft = -1, retright = -1;cin >> n;cin >> x;int left = 1;int right = 1;int sum = 0;for (int i = 1; i <= n; i++){cin >> arr[i];}while (right <= n){sum += arr[right];while (sum >= x){if (right - left + 1 < retlen){retleft = left;retright = right;retlen = right - left + 1;}sum -= arr[left++];}right++;}cout << retleft << ' ' << retright;return 0;
}