#include <iostream>
#include <iterator>
#include <ostream>
#include <set>
 
struct Point : std::pair<int, int> {
 
   using pair<int, int>::pair;
};
 
std::ostream& operator<<(std::ostream& o, const Point& p) {
  return o << p.first << ' ' << p.second;
}
 
 
int main()
{
    std::set<Point> s;
    s.insert( Point(2,2) );
    s.insert( Point(3,3) );
    s.insert( Point(2,3) );
    s.insert( Point(4,4) );
    std::copy(s.begin(), s.end(), std::ostream_iterator<Point>(std::cout, "\n"));
}

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