代码：

#include<iostream>
using namespace std;
int a[3000];
int n,m,b = 0,minn = 100000;
int main(){
	cin >> n >> m;
	if(n == 0){
	    cout << 0;
	    return 0;
	}
	for(int i = 0;i < n;i++){
		cin >> a[i];
	}
	for(int i = 0;i < n - m;i++){
		for(int j = 0;j < m;j++){
		    b += a[i + j];
		}
		if(b < minn) minn = b;
		b = 0;
	}
	cout << minn;
	return 0;
}