牛客国庆days赛 地铁

传送门：https://ac.nowcoder.com/acm/problem/52805

我佛了，还能跑边图啊！！！

跑边图不能用vector啦啦啦啦啦

具体也不难，就直接上代码了

#include<cstdio>
#include<queue>
#include<iostream>
#include<cstring>
#include<vector>
using namespace std;
typedef long long ll;
const int maxn = 2e5 + 7;
const int INF = 0x3f3f3f3f;
int n, m;
int head[maxn];

struct edge {
	int p;
	ll len;
	edge(int _p, ll _len) :p(_p), len(_len) {}
};

struct Node {
	int p;
	ll len;
	ll c;
	int next;
}G[maxn];

int cnt = 1;

void add(int be, int en, ll c,ll len) {
	G[cnt].p = en; G[cnt].next = head[be]; head[be] = cnt; G[cnt].len = len; G[cnt].c = c;//头插法
	cnt++;
}

bool operator <(const edge a, const edge b) {
	return a.len > b.len;
}
ll dis[maxn];
int vis[maxn];

ll dij() {
	for (int i = 0; i < maxn; i++) dis[i] = 1e17;
	priority_queue<edge>que;

	for (int i = head[1]; i; i = G[i].next) {
		dis[i] = G[i].len;
		que.push(edge(i, dis[i]));
	}
	ll a = 1e16;
	while (que.size()) {
		edge ans = que.top();
		que.pop();
		if (vis[ans.p]) continue;
		vis[ans.p] = 1;
		
		int x = G[ans.p].p;
		if (n == x) a = min(dis[ans.p], a);
		
		for (int i = head[x]; i; i = G[i].next) {

			if (dis[i] > dis[ans.p] + G[i].len + abs(G[ans.p].c - G[i].c)) {
				dis[i] = dis[ans.p] + G[i].len + abs(G[ans.p].c - G[i].c);
			
				que.push(edge(i, dis[i]));
			}
		}
	}
	return a;
}
int main() {

	int be, en;
	ll c, len;
	scanf("%d %d", &n, &m);
	for (int i = 0; i < m; i++) {
		scanf("%d %d %lld %lld", &be, &en, &c, &len);
		add(be, en, c, len);
		add(en, be, c, len);
	}
	ll ans = dij();
	cout << ans << endl;
	return 0;
}