hdu 3790 最短路问题 (spfa练手)

#include <cstdio>
#include <map>
#include <iostream>
#include<cstring>
#include<bits/stdc++.h>
#define ll long long int
#define M 6
using namespace std;
inline ll gcd(ll a,ll b){return b?gcd(b,a%b):a;}
inline ll lcm(ll a,ll b){return a/gcd(a,b)*b;}
int moth[13]={0,31,28,31,30,31,30,31,31,30,31,30,31};
int dir[4][2]={1,0 ,0,1 ,-1,0 ,0,-1};
int dirs[8][2]={1,0 ,0,1 ,-1,0 ,0,-1, -1,-1 ,-1,1 ,1,-1 ,1,1};
const int inf=0x3f3f3f3f;
const ll mod=1e9+7;
struct node{ 
    int next;
    int to;
    int d,p;
};
node edge[200007];
int head[1007];
int cnt;
void add(int u,int v,int d,int p){
    edge[++cnt].next=head[u];
    edge[cnt].to=v;
    edge[cnt].d=d;
    edge[cnt].p=p;
    head[u]=cnt;
}
int n,m;
int s,e;
bool vis[1007];
int dis[1007],cost[1007];
void spfa(int x){
    for(int i=1;i<=n;i++){
        dis[i]=inf;
        cost[i]=inf;
    }
    dis[x]=cost[x]=0;
    memset(vis,0,sizeof(vis));
    queue<int > q;
    q.push(x);
    vis[x]=1;
    while(!q.empty()){
        int u=q.front();
        q.pop();
        vis[u]=0;
        for(int i=head[u];i!=0;i=edge[i].next){
            int to=edge[i].to; int d=edge[i].d; int p=edge[i].p;
            if(dis[to]>dis[u]+d||((dis[to]==dis[u]+d)&&(cost[to]>cost[u]+p))){
                cost[to]=cost[u]+p;
                dis[to]=dis[u]+d;
                if(!vis[to]){
                    q.push(to);
                    vis[to]=1;
                }
            }
        }
    }
        
}
int main(){
    //ios::sync_with_stdio(false);
    while(scanf("%d%d",&n,&m)!=EOF){
        if(!n&&!m) break;
        memset(head,0,sizeof(head));
        cnt=0;
        for(int i=1;i<=m;i++){
            int a,b,d,p;
            scanf("%d%d%d%d",&a,&b,&d,&p);
            add(a,b,d,p);
            add(b,a,d,p);
        }
        scanf("%d%d",&s,&e);
        spfa(s);
        printf("%d %d\n",dis[e],cost[e]);
    }
}