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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3.  
  4. struct edge{
  5.     int connect;
  6.     int price;
  7.  
  8. };
  9.  
  10. int dijsktra(vector<edge> al[], int source, int target, int c){
  11.     vector<int> min_dis(c+1, INT_MAX);
  12.     min_dis[source] = 0;
  13.  
  14.     set< pair<int, int> > active_vertices;
  15.     active_vertices.insert(make_pair(0, source));
  16.  
  17.     while(!active_vertices.empty()){
  18.         int where = active_vertices.begin()->second;
  19.         if(where==target){
  20.             return min_dis[where];
  21.         }
  22.         active_vertices.erase(active_vertices.begin());
  23.         for(int i=0; i<al[where].size(); i++){
  24.             if(min_dis[al[where][i].connect] > min_dis[where]+al[where][i].price){
  25.                 active_vertices.erase({min_dis[al[where][i].connect], al[where][i].connect});
  26.                 min_dis[al[where][i].connect] = min_dis[where]+al[where][i].price;
  27.                 active_vertices.insert(make_pair(min_dis[al[where][i].connect], al[where][i].connect));
  28.             }
  29.         }
  30.     }
  31.     return -1;
  32. }
  33.  
  34. int main(){
  35.     int c, f;
  36.     cin >> c >>  f;
  37.     vector<edge> al[c+1];
  38.     for(int i=0; i<f; i++){
  39.         int x;
  40.         edge t;
  41.         cin >> x >> t.connect >> t.price;
  42.         al[x].push_back(t);
  43.     }
  44.     vector<int> cheap;
  45.     for(int i=1; i<=c; i++){
  46.         for(int j=1; j<=c; j++){
  47.             if(i!=j)
  48.             cheap.push_back(dijsktra(al, i, j, c));
  49.         }
  50.     }
  51.     cout << *max_element(cheap.begin(), cheap.end());
  52. }
  53.  
Success #stdin #stdout 0s 3476KB
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4 5
1 2 10
1 3 24
2 3 2
2 4 15
3 4 7
stdout
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19
https://ideone.com/Muolhq
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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