80分，错在2和8测试点，谁能帮我挑挑错。谢谢！

# include <iostream>
using namespace std;
int main(){
	int n;
	int m;
	cin >> n >> m;
	int a[1000000];
	int low = 9999;
	int sum;
	for(int _=1;_<=n;_++){
		 cin >> a[_];
	}
	for(int i=1;i<=n - m + 1;i++){
		sum = 0;
		for(int j=1;j<=m;j++){
			sum += a[i + j - 1];
		}
		if(sum < low){
			low = sum;
		}
	}
	cout << low;
}