错误：
 

#include <bits/stdc++.h>
using namespace std;
const int N = 1e3 + 9;
struct Node{
    int v, w, c;
    bool operator < (const Node &other) const{
        if(w != other.w) return w > other.w;
        if(w == other.w) return c > other.c;
        return v > other.v;
    }
};
vector<Node> g[N];
int dis[N]; int cost[N];
bool vis[N];

int main() {
	int n, m;
	while(cin >> n >> m)
	{
        for(int i = 1; i <= n; i++) g[i].clear();
	    if(n == 0 && m == 0) break;
	    memset(dis, 0x3f, sizeof(dis));
	    memset(cost, 0x3f, sizeof(cost));
	    memset(vis, false, sizeof(vis));
	    for(int i = 1; i <= m; i ++)
	    {
	        int u, v, w, c; cin >> u >> v >> w >> c;
	        g[u].push_back({v, w, c}); g[v].push_back({u, w, c});
	    }
	    int s, e; cin >> s >> e;
	    priority_queue<Node> pq; pq.push({s, 0, 0});
	    dis[s] = 0; vis[s] = true; cos...