#include<bits/stdc++.h>
#define task "cities"
#define ii pair<int,int>
#define iii pair<int,ii>
#define iv pair<ii,ii>
#define se second
#define fi first
#define int long long
#define ffi fi.fi
#define sfi se.fi
#define sse se.se
#define fse fi.se
#define lt(i, c, d) for(int i = c; i <= d; ++i)
#define fl(i, c, d) for(int i = d; i >= c; --i)
#define pb push_back
#define emb emplace_back
#define emf emplace_front
#define em emplace
using namespace std;
const int N=1e5+5,lg=20,mod=1e9+7;
mt19937 rd(chrono::steady_clock::now().time_since_epoch().count());
int Rand(int u,int v){
return u+rd()%(v-u+1);
}
int n,k,m,b[5],dist[N][1<<5];
vector<ii>a[N];
void dijk(){
priority_queue<ii,vector<ii>,greater<ii>>p;
for(int i=1;i<(1<<k);++i){
for(int z=1;z<=n;++z){
for(int j=i;(j^i)<j;j=(j-1)&i){
dist[z][i]=min(dist[z][i],dist[z][j]+dist[z][i^j]);
}
if(dist[z][i]!=1e18){
p.em(dist[z][i],z);
}
}
while(!p.empty()){
int u=p.top().se;
int w=p.top().fi;
p.pop();
if(w>dist[u][i])continue;
for(ii v:a[u]){
if(dist[v.fi][i]>dist[u][i]+v.se){
dist[v.fi][i]=dist[u][i]+v.se;
p.em(dist[v.fi][i],v.fi);
}
}
}
}
}
void solve(){
cin >> n >> k >> m;
for(int i=1;i<=n;++i){
for(int j=1;j<(1<<k);++j){
dist[i][j]=1e18;
}
}
for(int i=1;i<=k;++i){
int u;
cin >> u;
dist[u][1<<(i-1)]=0;
}
for(int i=1;i<=m;++i){
int u,v,w;
cin >> u >> v >> w;
a[u].emb(v,w);
a[v].emb(u,w);
}
dijk();
int res=1e18;
for(int i=1;i<=n;++i){
res=min(res,dist[i][(1<<k)-1]);
}
cout<<res;
}
main()
{
srand(time(0));
ios_base::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
if(fopen(task".inp","r")){
freopen(task".inp","r",stdin);
freopen(task".out","w",stdout);
}
int t=1;
// cin >> t;
while(t--){
solve();
cout<<'\n';
}
}
Compilation message (stderr)
cities.cpp:77:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
77 | main()
| ^~~~
cities.cpp: In function 'int main()':
cities.cpp:84:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
84 | freopen(task".inp","r",stdin);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
cities.cpp:85:14: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
85 | freopen(task".out","w",stdout);
| ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
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