SPFA It's not omnipotent to find the shortest path . Heap optimization in dense graph dijkstra More efficient ：

```typedef pair<int,int> pii;
priority_queue<pii, vector<pii>, greater<pii> > q
void dijkstra(){
memset(dis,10,sizeof(dis));
memset(vis,0,sizeof(vis));
dis[K]=0;
q.push(make_pair(dis[K],K));
while(!q.empty()){
pii tmp=q.top();q.pop();
int node=tmp.second;
if(vis[node])continue;
vis[node]=1;
if(dis[e[i].y]>dis[node]+e[i].v){
dis[e[i].y]=dis[node]+e[i].v;
q.push(make_pair(dis[e[i].y],e[i].y));
}
}
}
```

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