#include <iostream>
#include <unordered_map>
 
using namespace std;
 
namespace std {
template<>
class hash<std::pair<int, int>> {
public:
  	size_t operator()(const std::pair<int, int> &p) const
  {
    return std::hash<int>()(p.first) ^ std::hash<int>()(p.second);
  }
};
}
 
int main()
{
    std::pair <int, int> var1;
    var1=std::make_pair(10,20);
    cout<<"\n var1.f="<<var1.first<<"\t 2."<<var1.second<<"\n";
    std::unordered_map <std::pair <int,int>, int> yeah;
 
   return 0;
}

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