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#include<bits/stdc++.h>
using namespace std;
vector<pair<int,int>>adj[1000001];
int main(){
int n;
cin>>n;
unordered_map<int,int>mp;
for(int i=0;i<n;++i){
int x;
cin>>x;
mp[x]=INT_MAX;
}
int e;
cin>>e;
for(int i=0;i<e;++i){
int x,y,d;
cin>>x>>y>>d;
adj[x].push_back({y,d});
}
int src,dest;
cin>>src>>dest;
set<pair<int,int>>s;
mp[src]=0;
s.insert({0,src});
while(!s.empty()){
pair<int,int>tmp=*(s.begin());
s.erase(s.begin());
int u=tmp.second;
for(auto i=adj[u].begin();i!=adj[u].end();++i){
int v=(*i).first;
int weight=(*i).second;
if(mp[v]>mp[u]+weight){
if(mp[v]!=INT_MAX)
s.erase(s.find({mp[v],v}));
mp[v]=mp[u]+weight;
s.insert({mp[v],v});
}
}
}
if(mp[dest]==INT_MAX)
cout<<"-1"<<endl;
else
cout<<mp[dest]<<endl;
return 0;
}
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