参考链接

感觉好像就是双指针啊

#include <bits/stdc++.h>

using namespace std;

int i, j, n;
int a[200];
int sum, m, ans;

int main(){

    cin >> n >> m;
    for(int i = 0;i < n;i ++ ) cin >> a[i];
    i = j = sum = 0;
    ans = n;
    for(j = 0;j < n;j ++ ){
        sum += a[j];
        while(sum >= m) sum -= a[i ++ ];
        ans = min(ans, j - i + 1);
    }
    cout << ans;
    return 0;
}