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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3.  
  4. struct abc{
  5.     int u, v, cost;
  6. };
  7.  
  8. int n, m, pr[300005];
  9. vector <abc> edg;
  10.  
  11. bool check(int mask, int pos) { return (mask & (1 << pos)); }
  12.  
  13. int findP(int u)
  14. {
  15.     if(u == pr[u]) return u;
  16.     return pr[u] = findP(pr[u]);
  17. }
  18.  
  19. void connect(int u, int v)
  20. {
  21.     u = findP(u);
  22.     v = findP(v);
  23.     pr[u] = v;
  24. }
  25.  
  26. int main()
  27. {
  28.     int t;
  29.     cin >> t;
  30.     while(t--){
  31.         cin >> n >> m;
  32.  
  33.         for(int i = 0; i < m; i++){
  34.             int u, v, cost;
  35.             cin >> u >> v >> cost;
  36.             edg.push_back({u, v, cost});
  37.         }
  38.  
  39.         for(int i = 0; i <= n; i++)
  40.             pr[i] = i;
  41.  
  42.         int ans = 0;
  43.         for(int i = 31; i >= 0; i--){
  44.             int tempAns = ans, pos = -1;
  45.             if(check(ans, i)) continue;
  46.             for(int j = 0; j < m; j++){
  47.                 if(check(edg[j].cost, i) && findP(edg[j].u) != findP(edg[j].v) && tempAns <= (ans | edg[j].cost)){
  48.                     tempAns = (ans | edg[j].cost);
  49.                     pos = j;
  50.                 }
  51.             }
  52.             if(pos != -1){
  53.                 connect(edg[pos].u, edg[pos].v);
  54.                 ans = tempAns;
  55.             }
  56.         }
  57.  
  58.         cout << ans << "\n";
  59.  
  60.         edg.clear();
  61.     }
  62.  
  63.  
  64.     return 0;
  65. }
  66.  
  67.  
  68.  
Success #stdin #stdout 0.01s 5512KB
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https://ideone.com/yJA3Q3
language:
C++14 (gcc 8.3)
created:
2 years ago
visibility:
public

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