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  1. #include <stdexcept>
  2. #include <iostream>
  3. #include <deque>
  4.  
  5. class TrainComposition
  6. {
  7.     //std::vector<int> wagons;
  8.  
  9. public:
  10.  
  11.     std::deque<int> wagons;
  12.  
  13.     void attachWagonFromLeft(int wagonId)
  14.     {
  15.         wagons.push_front(wagonId);
  16.     }
  17.  
  18.     void attachWagonFromRight(int wagonId)
  19.     {
  20.         wagons.push_back(wagonId);
  21.     }
  22.  
  23.     int detachWagonFromLeft()
  24.     {
  25.         std::deque<int>::iterator it = wagons.begin();
  26.         std::cout << "bigin is:" << *it << '\n';
  27.         wagons.pop_front();
  28.         return *it;
  29.     }
  30.  
  31.     int detachWagonFromRight()
  32.     {
  33.         std::deque<int>::iterator it = wagons.end();
  34.         std::cout<< "end is:" << *it<<'\n';
  35.         wagons.pop_back();
  36.         return 0;
  37.     }
  38. };
  39.  
  40. #ifndef RunTests
  41. int main()
  42. {
  43.     TrainComposition tree;
  44.     tree.attachWagonFromLeft(7);
  45.     tree.attachWagonFromLeft(13);
  46.     std::cout << tree.detachWagonFromRight() << "\n"; // 7 
  47.     std::cout << tree.detachWagonFromLeft() << "\n"; // 13
  48.     return 0;
  49. }
  50. #endif
Success #stdin #stdout 0s 15240KB
comments (?)
stdin 
Standard input is empty
stdout 
end is:0
0
bigin is:13
13
https://ideone.com/ryqArI
language:
C++ (gcc 8.3)
created:
8 years ago
visibility:
public

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