这是题目

本来0pts也正常

离奇之处在于，我下载了的一个测试点的数据

in:
  4 6279
  90560 55497 63624
  171 103 126 112

out:
  4522

然而，诸位可以一试，代码能给出正确答案

评测得分0pts?!!

求dalao指导

代码如下

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int M = 1e5 + 5;
int n, d;
int dis[M], dis0[M];
int price[M], nxt[M];
int ans;
signed main(void) {
	scanf("%lld %lld", &n, &d);
	for (int i = 1; i < n; ++i)
		scanf("%lld", &dis0[i]);
	for (int i = 2; i <= n; ++i)
		dis[i] = dis0[i - 1] + dis[i - 1];
	for (int i = 1; i <= n; ++i)
		scanf("%lld", &price[i]);
	int lastPrice = price[1];
	int lastI = 1;
	for (int i = 2; i < n; ++i)
		if (price[i] < lastPrice) {
			nxt[lastI] = i;
			lastI = i;
			lastPrice = price[i];
		}
	nxt[lastI] = n;
	int dist, mov;
	for (int i = 1; i < n; i = nxt[i]) {
		dist = dis[nxt[i]] - dis[i];
		ans += (dist - mov + d - 1) / d * price[i];
		mov += (dist - mov + d - 1) / d * d - dist;
	}
	printf("%lld", ans);
	return 0;
}