#include <stdio.h>
#include<stdlib.h>
int main() {
	int n, m;
	scanf("%d%d", &n, &m);
	int*arr = (int*)malloc(sizeof(int)*n);
	int min=0;
	for (int i = 0; i < n; i++) {
		scanf("%d", &arr[i]);
	}
	int sum = 0;
	for (int i = 0; i < n-m; i++) {
		for (int j = i; j < i + m; j++) {
			sum += arr[j];
		}
		if (i == 0) {
			min = sum;
		}
		if (sum < min) {
			min = sum;
		}sum = 0;
	}
	printf("%d", min);
	return 0;
}

今天就磕在这儿了