#include <set>
#include <iostream>
#include <utility>

int main()
{
  typedef std::set<std::pair<int, int> > PairContainer;
  PairContainer container;

  const int TOTAL_PAIRS = 100l;

  for ( int i = 0; i < TOTAL_PAIRS; i++ )
  {
	  for ( int j = 0; j < TOTAL_PAIRS; j++ )
	  {
		  if ( !container.insert(std::make_pair(i, j)).second )
		  {
			  std::cout << "Cannot Insert Pair (" << i << ", " << j << ")" << std::endl;
		  }
	  }
  }

  return 0;
}