刚学前缀和求条

#include <bits/stdc++.h>
using namespace std;
int a[3010];
int main() {
    int n, m;
    cin >> n >> m;
    int tmp;
    int cnt = 0;
    for(int i = 0; i < n; i++) {
        cin >> tmp;
        cnt += tmp;
        a[i] = cnt;
    }
    int mi = INT_MAX;
    for(int i = m; i < n; i++) {
        if(a[i] - a[i - m] < mi) mi = a[i] - a[i - m];
    }
    cout << mi;
    return 0;
}