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  1. #include<bits/stdc++.h>
  2. using namespace std;
  3. #define int long long int
  4.  
  5. int mx = 1e18;
  6. int32_t main() {
  7.   ios::sync_with_stdio(false);cin.tie(nullptr);
  8.   int n, m, q;
  9.   cin >> n >> m >> q;
  10.   // nxn matrix
  11.   vector<vector<int>>matrix(n, vector<int>(n, mx));
  12.   for(int i = 0; i < m; i++) {
  13.     int a, b, c;
  14.     cin >> a >> b >> c;
  15.     a--, b--;
  16.     matrix[a][b] = matrix[b][a] = min(matrix[a][b], c);
  17.   }
  18.   for (int i = 0; i < n; i++) {
  19.     matrix[i][i] = 0;
  20.   }
  21.   for(int k = 0; k < n; k++) { // here k is intermediate node
  22.     for(int i = 0; i < n; i++) {
  23.       for(int j = 0; j < n; j++) {
  24.         matrix[i][j] = min(matrix[i][j], matrix[i][k]+matrix[k][j]);
  25.       }
  26.     }
  27.   }
  28.   // query
  29.   while(q--) {
  30.     int a, b;
  31.     cin >> a >> b;
  32.     a--, b--;
  33.     if(matrix[a][b] == mx) cout << "-1\n";
  34.     else cout << matrix[a][b] << "\n";
  35.   }
  36.   return 0;
  37. }
Success #stdin #stdout 0s 5264KB
comments (?)
stdin
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4 3 5
1 2 5
1 3 9
2 3 3
1 2
2 1
1 3
1 4
3 2
stdout
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5
5
8
-1
3
https://ideone.com/rW6h0r
language:
C++14 (gcc 8.3)
created:
1 day ago
visibility:
public

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