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  1. #include <vector>
  2. #include <map> //for std::pair
  3. #include <iostream>
  4. #include <algorithm> //for std::rotate
  5.  
  6. typedef std::pair<int,int> entry;
  7. typedef std::vector<entry> storage;
  8.  
  9.  
  10. void print( const char* msg, const storage& obj )
  11. {
  12.     std::cout<<msg<<std::endl;
  13.     for(auto i : obj)
  14.     {
  15.         std::cout << i.first << "," << i.second << std::endl;
  16.     }
  17. }
  18.  
  19. void lookup(int key, const storage& obj)
  20. {
  21.     for(auto i : obj)
  22.     {
  23.         if( i.first == key )
  24.         {
  25.             std::cout<<"\t"<<key<<"=>"<<i.second<<std::endl;
  26.             return;
  27.         }
  28.     }
  29.     std::cout<<key<<"not found"<<std::endl;
  30. }
  31.  
  32. int main()
  33. {
  34.     storage mymap = {entry(122,1),entry(12,2),entry(3,45)};
  35.     print("Before rotation", mymap);
  36.     lookup(12,mymap);
  37.     std::rotate(mymap.begin(),mymap.begin()+1,mymap.end());
  38.     print("After one rotation", mymap);
  39.     lookup(12,mymap);
  40.     std::rotate(mymap.begin(),mymap.begin()+1,mymap.end());
  41.     print("After one more rotation", mymap);
  42.     lookup(12,mymap);
  43.     return 0;
  44. }
Success #stdin #stdout 0s 3476KB
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stdin
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Standard input is empty
stdout
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Before rotation
122,1
12,2
3,45
	12=>2
After one rotation
12,2
3,45
122,1
	12=>2
After one more rotation
3,45
122,1
12,2
	12=>2
https://ideone.com/NbT6HI
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
secret

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