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  1. #include <bits/stdc++.h>
  2. #define ll long long
  3. #define ld long double
  4. #define IO ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0);
  5. using namespace std;
  6. const int N = 1e5 + 5, M = 2 * N + 5;
  7.  
  8. int n, m,s,l,k;
  9. vector<pair<int,int> > adj[N];
  10.  
  11. int lev[N],mx=0;
  12.  
  13. void bfs(int st){
  14.     queue<int> q;
  15.     q.push(st);
  16.     lev[st] = 1;
  17.     while(q.size()){
  18.         int sz = q.size();
  19.         while(sz--){
  20.             int u = q.front();
  21. //                cout<<u<<" "<<adj[u].size()<<endl;
  22.             q.pop();
  23.             for(auto v : adj[u])
  24.             {
  25.                 if(lev[v.first]<=k)
  26.                     mx=max(v.second,mx);
  27.                 if(!lev[v.first])
  28.                     q.emplace(v.first), lev[v.first] = lev[u] + 1;
  29.             }
  30.         }
  31.     }
  32. }
  33.  
  34. int main(){
  35.     IO;
  36.     int t;
  37.     cin>>t;
  38.     while(t--)
  39.     {
  40.         mx=0;
  41.         for(int i=0;i<n;i++)
  42.         {
  43.             adj[i].clear();
  44.             lev[N]=0;
  45.         }
  46.         cin>>n>>m>>s>>l>>k;
  47.         for(int i = 0 ; i < m ; ++i){
  48.             int u, v, w;
  49.             cin>>u>>v>>w;
  50.             adj[u].emplace_back(v,w);
  51.             adj[v].emplace_back(u,w);
  52.         }
  53.     //    for(int i = 0 ; i <= m ; ++i){
  54.     //            cout<<i<<" :";
  55.     //        for(auto v: adj[i])
  56.     //            cout<<v.first<<" ";
  57.     //    cout<<endl;
  58.     //    }
  59.         bfs(s);
  60.  
  61.         cout<<mx<<endl;
  62.     }
  63. }
  64.  
Success #stdin #stdout 0s 6024KB
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https://ideone.com/IcEBeh
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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