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  1. #include <iostream>
  2. #include <vector>
  3. #include <cstdlib>
  4. using namespace std;
  5.  
  6. int compare(const void *a, const void *b) {
  7.     int x = ((pair<int,int>*)a)->first;
  8.     int y = ((pair<int,int>*)b)->first;
  9.     return x - y;
  10. }
  11.  
  12.  
  13. int main() {
  14.  
  15.     int m = 3;
  16.  
  17.     vector<pair<int, int>> weight(m);
  18.  
  19.     weight[0].first = 3;
  20.     weight[0].second = 0;
  21.  
  22.     weight[1].first = 2;
  23.     weight[1].second = 5;
  24.  
  25.     weight[2].first = 1;
  26.     weight[2].second = 6;
  27.  
  28.     for (int i = 0; i < m; i++) {
  29.         cout << weight[i].first << " " << weight[i].second << endl;
  30.     }
  31.  
  32.     cout << endl;
  33.  
  34.     qsort(&weight[0].first, m, sizeof(weight[0]), compare);
  35.  
  36.     for (int i = 0; i < m; i++) {
  37.         cout << weight[i].first << " " << weight[i].second << endl;
  38.     }
  39.  
  40.  
  41.  
  42.     return 0;
  43. }
  44.  
  45.  
Success #stdin #stdout 0s 5548KB
comments (?)
stdin
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Standard input is empty
stdout
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3 0
2 5
1 6

1 6
2 5
3 0
https://ideone.com/SAh8xR
language:
C++14 (gcc 8.3)
created:
4 years ago
visibility:
secret

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