码风良好，玄关求助

#include <bits/stdc++.h>
using namespace std;
const int maxn = 5e5 + 10;
const long long inf = (1ll << 63) - 1;
int n,m,s;
int vis[maxn];//判断这个节点是否被遍历过
long long dis[maxn];//i节点到s目前的最短路
struct node{
  long long to,w;
  friend bool operator < (node a,node b) {
    return a.w < b.w;
  }//重载运算符维护一个小根堆
};
priority_queue<node> q;
struct edge{
  long long to,w;
};
vector <edge> g[maxn];
int main() {
  //cout << inf << endl;
  cin >> n >> m >> s;
  for (int i = 1; i <= m; i++) {
    int u,v,w;
    cin >> u >> v >> w;
    g[u].push_back(edge{v,w});
    g[v].push_back(edge{u,w});
  }
  for (int i = 1; i <= n; i++)
    dis[i] = inf;
  dis[s] = 0;
  q.push(node{s,0});
  while (!q.empty()) {
    node now = q.top();
    q.pop();
    int v = now.to;
    if (vis[v]) continue;
    vis[v] = 1;
    for (int i = 0; i < g[v].size(); i++) {
      long long t = g[v][i].to;
      if (dis[t] > (long long)(dis[v] + g[v][i].w)) {
        dis[t] = dis[v] + g[v][i].w;
        q.push(node{t,dis[t]});

      }
    }
  }
  for (int i = 1; i <= n; i++)
    cout << dis[i] << " ";
  return 0;
}