求救求救 spfa 过不了

#include<bits/stdc++.h>
using namespace std;

int number,way,mapp[3002][3002],x,y,distance1,start,dis[30000002];
int head,tail,q[300002],vis[300002],v;

void SPFA(int s){
	for(int i=1;i<=number;i++)dis[i]=9999999;
	head=0;tail=1;
	dis[s]=0;vis[s]=1;q[tail]=s;
	while(head<tail){
		head++;v=q[head];vis[v]=0;
		for(int i=1;i<=number;i++){
			if(mapp[v][i]>0&&dis[i]>dis[v]+mapp[v][i]){
				dis[i]=dis[v]+mapp[v][i];
				if(!vis[i]){
					tail++;q[tail]=i;vis[i]=1;
				}
			}
		}
	}
}

int main(){
	cin>>number>>way>>start;
	for(int i=1;i<=way;i++){
		cin>>x>>y>>distance1;
		if(mapp[x][y]!=0)mapp[x][y]=min(mapp[x][y],distance1);
		else mapp[x][y]=distance1;
	}
	SPFA(start);
	for(int i=1;i<=number;i++)cout<<dis[i]<<" ";
	return 0;
}