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  1. #include <iostream>
  2. #include <algorithm>
  3. #include <chrono>
  4. #include <random>
  5. #include <vector>
  6. #include <iomanip>
  7.  
  8. template <class IntType>
  9. IntType random(IntType a, IntType b) {
  10.     static std::minstd_rand generator(
  11.         static_cast<unsigned>(
  12.             std::chrono::system_clock::now().time_since_epoch().count()
  13.         )
  14.     );
  15.     std::uniform_int_distribution<int> distribution(a, b);
  16.     return distribution(generator);
  17. }
  18.  
  19. using Matrix = std::vector<std::vector<int>>;
  20. std::ostream& operator<< (std::ostream& out, Matrix const& matrix) {
  21.     int offset = out.width();
  22.     for(auto const& row: matrix) {
  23.         out << std::setw(offset);
  24.  
  25.         for(auto const& element: row) {
  26.             out << ' ' << std::setw(4) << std::left << element;
  27.         }
  28.  
  29.         out << '\n';
  30.     }
  31.  
  32.     return out;
  33. }
  34. int main() {
  35.     Matrix matrix(random(5u, 10u));
  36.     std::generate(matrix.begin(), matrix.end(), [] {
  37.         std::vector<int> row(random(5u, 10u));
  38.         std::generate(row.begin(), row.end(), [] { return random(0, 100); });
  39.         return row;
  40.     });
  41.  
  42.     std::cout << std::setw(5) << matrix << '\n';
  43.  
  44.     int k = 4;
  45.     for(size_t row = 1; row < matrix.size(); row += 2) {
  46.         std::rotate(matrix[row].begin(), matrix[row].begin() + k, matrix[row].end());
  47.     }
  48.  
  49.     std::cout << "After rotate odd rows on " << k << " elements to left: \n"
  50.               << std::setw(5) << matrix << std::endl;
  51.  
  52.  
  53.     return 0;
  54. }
Success #stdin #stdout 0s 4220KB
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stdin
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Standard input is empty
stdout
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     41   37   31   90   44   11   45   18   17   9   
     62   53   61   60   42   21   61   14   17   16  
     54   58   90   3    28  
     59   45   78   32   55   13  
     5    38   32   97   26   48   59   100  97  
     19   87   58   10   5   
     12   43   8    78   92   88   98   50   12   26  

After rotate odd rows on 4 elements to left: 
     41   37   31   90   44   11   45   18   17   9   
     42   21   61   14   17   16   62   53   61   60  
     54   58   90   3    28  
     55   13   59   45   78   32  
     5    38   32   97   26   48   59   100  97  
     5    19   87   58   10  
     12   43   8    78   92   88   98   50   12   26
https://ideone.com/DM9zQX
language:
C++14 (gcc 8.3)
created:
5 years ago
visibility:
secret

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