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  1. #include <cstdlib>
  2. #include <iostream>
  3.  
  4. const int COL = 2;
  5.  
  6. int compare_rows(const void* lhs, const void* rhs)
  7. {
  8.     auto l = static_cast<const int(*)[COL]>(lhs);
  9.     auto r = static_cast<const int(*)[COL]>(rhs);
  10.     return (*r)[COL-1] - (*l)[COL-1];
  11. }
  12.  
  13. int main()
  14. {
  15.     int Arr[3][COL] = {{1, 5}, {2, 8}, {3, 3}};
  16.  
  17.     std::qsort(Arr, 3, sizeof Arr[0], compare_rows);
  18.  
  19. // IDEone still has an outdated compiler, no range loops
  20. //    for(auto& row: Arr)
  21. //    {
  22. //        for(auto& n: row)
  23. //            std::cout << n << ' ';
  24. //        std::cout << '\n';
  25. //    }
  26.     for(int row = 0; row < 3; ++row)
  27.     {
  28.         for(int col = 0; col < COL; ++col)
  29.             std::cout << Arr[row][col] << ' ';
  30.         std::cout << '\n';
  31.     }
  32. }
  33.  
Success #stdin #stdout 0s 2884KB
comments (?)
stdin
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Standard input is empty
stdout
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2 8 
1 5 
3 3
https://ideone.com/WhMqIb
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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