#include<bits/stdc++.h>
using namespace std;
#define int int64_t
#define all(x) x.begin(),x.end()
#define all1(x) x.rbegin(),x.rend()
#define sz(x) (int)(x.size())
const int N=1e4+5,N1=1e18,mod=1e9+7;
void solve(){
int n,m,k;
cin>>n>>m>>k;
n+=5;
using gh=pair<int,int>;
vector<pair<int,int>> adj[n];
for (int i=1,u,v,w;i<=m;i++){
cin>>u>>v>>w;
adj[u].emplace_back(v,w);
adj[v].emplace_back(u,w);
}
vector<gh> dis(n,{N1,N1});
priority_queue<gh,vector<gh>,greater<gh>> q;
vector<bool> vis(n);
for (int i=0,x;i<k;i++){
cin>>x;
q.emplace(0,x);
dis[x]={0,0};
}
while(!q.empty()){
int u,dis1;
tie(dis1,u)=q.top();
q.pop();
//cerr<<u<<" "<<dis1<<"\n";
if (vis[u]){continue;}
vis[u]=1;
for (const gh &it:adj[u]){
int cur=dis1+it.second;
if (dis[it.first].first>=cur){
dis[it.first].second=dis[it.first].first;
dis[it.first].first=cur;
}
else if (cur<dis[it.first].second){
dis[it.first].second=cur;
}
if (dis[it.first].first!=N1 && dis[it.first].second!=N1 && !vis[it.first]){
q.emplace(dis[it.first].second,it.first);
}
}
}
cout<<dis[0].second;
}
int32_t main(){
ios::sync_with_stdio(false);cin.tie(nullptr);cout.tie(nullptr);
int tq=1;
//cin>>tq;
for (;tq;tq--){solve();}
}
Compilation message
/usr/bin/ld: /tmp/ccFYK1U7.o: in function `main':
grader.cpp:(.text.startup+0x0): multiple definition of `main'; /tmp/ccOL1GH8.o:crocodile.cpp:(.text.startup+0x0): first defined here
/usr/bin/ld: /tmp/ccFYK1U7.o: in function `main':
grader.cpp:(.text.startup+0x36): undefined reference to `travel_plan(int, int, int (*) [2], int*, int, int*)'
collect2: error: ld returned 1 exit status
