struct Edge{
int to, next;
int w;
}edge[MAXM];
struct qnode{
int u;
int c;
qnode(int _u = 0, int _c = 0):u(_u), c(_c){}
bool operator < (const qnode &r) const{
return r.c < c;
}
};
int tot, head[maxn], vis[maxn];
int dis[maxn];
void addEdge(int u, int v, int w){
edge[tot].to = v;
edge[tot].w = w;
edge[tot].next = head[u];
head[u] = tot++;
}
void Dijkstra(int n, int st){
memset(vis, 0, sizeof(vis));
for(int i = 0; i <= n; i++) dis[i] = INF;
priority_queue<qnode> que;
while(!que.empty()) que.pop();
dis[st] = 0;
que.push(qnode(st, 0));
qnode temp;
while(!que.empty()){
temp = que.top();
que.pop();
int u = temp.u;
if(vis[u]) continue;
vis[u] = 1;
for(int i = head[u]; i != -1; i = edge[i].next){
int v = edge[i].to;
int w = edge[i].w;
if(!vis[v] && dis[v] > dis[u] + w){
dis[v] = dis[u] + w;
que.push(qnode(v, dis[v]));
}
}
}
}