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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. #define faster ios_base::sync_with_stdio(false); cin.tie(NULL)
  4. #define Bit(mask , i) ((mask >> i) & 1)
  5. #define fi first
  6. #define se second
  7. #define _LOG2(nl) 31 - __builtin_clz(nl)
  8. #define c_bit(nl) __builtin_popcount(nl)
  9. #define ii pair<int , pair<int , int>>
  10. #define lii pair<long long , pair<int , int>>
  11. #define li pair<long long , int>
  12. #define db double
  13. #define onBit(mask , i) (mask | (1 << i))
  14. #define offBit(mask , i) (mask & (~(1 << i)))
  15.  
  16. const long long INF = 1e16;
  17. const int N = 1e5 + 7;
  18. int n , m , k;
  19. int K[10] , col[N];
  20. vector<pair<int , long long>> a[N];
  21. long long dist[N][37];
  22.  
  23. void inp(){
  24.     cin >> n >> k >> m;
  25.     for (int i = 1 ; i <= k ; ++i){
  26.         cin >> K[i];
  27.         col[K[i]] = i;
  28.     }
  29.     for (int i = 1 ; i <= m ; ++i){
  30.         int u , v;
  31.         long long w;
  32.         cin >> u >> v >> w;
  33.         a[u].push_back({v , w});
  34.         a[v].push_back({u , w});
  35.     }
  36. }
  37.  
  38. void dijkstra(){
  39.     priority_queue<lii , vector<lii> , greater<lii>> pq;
  40.     pq.push({0 , {K[1] , 1}});
  41.     for (int i = 1 ; i <= n ; ++i){
  42.         for (int mask = 1 ; mask < (1 << k) ; ++mask){
  43.             dist[i][mask] = INF;
  44.         }
  45.     }
  46.     dist[K[1]][1] = 0;
  47.     while (pq.size()){
  48.         lii val = pq.top();
  49.         pq.pop();
  50.  
  51.         int u = val.se.fi , mask = val.se.se;
  52.         long long d_u = val.fi;
  53.         if (d_u > dist[u][mask]) continue;
  54.         for (auto &c : a[u]){
  55.             int v = c.fi;
  56.             long long w = c.se;
  57.             int n_mask = mask;
  58.             if (col[v] != 0) n_mask = onBit(n_mask , col[v] - 1);
  59.             if (dist[v][n_mask] > dist[u][mask] + w){
  60.                 dist[v][n_mask] = dist[u][mask] + w;
  61.                 pq.push({dist[v][n_mask] , {v , n_mask}});
  62.             }
  63.         }
  64.     }
  65. }
  66.  
  67. void solve(){
  68.     dijkstra();
  69.     long long res = INF;
  70.     for (int i = 1 ; i <= n ; ++i){
  71.         res = min(res , dist[i][(1 << k) - 1]);
  72.     }
  73.     cout << res;
  74. }
  75.  
  76. int main(){
  77.     if (fopen("cau4.inp" , "r")){
  78.         freopen("cau4.inp" , "r" , stdin);
  79.         freopen("cau4.out" , "w" , stdout);
  80.     }
  81.     faster;
  82.     inp();
  83.     solve();
  84.     return 0;
  85. }
  86.  
Success #stdin #stdout 0.01s 7240KB
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stdin
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Standard input is empty
stdout
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10000000000000000
https://ideone.com/EeOdqB
language:
C++14 (gcc 8.3)
created:
16 hours ago
visibility:
public

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