代码如下，数组也没有开大呀

/*
 * https://www.luogu.com.cn/problem/P5638
 * */
import java.util.*;
public class Main {
	static long n, k, res;
	static long[] sum = new long[1000001];
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		n = sc.nextLong();
		k = sc.nextLong();
		for (int i = 1; i < n; i++) {
			long num = sc.nextLong();
			sum[i] = sum[i - 1] + num;
		}
		if (k > n-1) {
			System.out.println(0);
			return;
		}//传送器的值大于目标城市，直接返回0
		for (int i = 0; i < n; i++) {
			res = Math.max(res, sum[(int) (i + k)] - sum[i]);
		}//得出可以节省的最大距离
		res = sum[(int)n-1] - res;//使用最后一位的和减去节省的最大值，即为答案
		System.out.println(res);
		sc.close();
	}
}