#include <iostream> 
#include <algorithm> 
 
struct Point
{
  int x;
  int y;
};
 
int main()
{
  Point ptLT{18, 4 };
  Point ptRT{28, 8 };
  Point ptRB{20, 40};
  Point ptLB{16, 6 };
 
  Point ptMin;
  Point ptMax;
 
  std::pair<int&, int&>(ptMin.x, ptMax.x) = std::minmax({ptLT.x, ptRT.x, ptRB.x, ptLB.x});
  std::pair<int&, int&>(ptMin.y, ptMax.y) = std::minmax({ptLT.y, ptRT.y, ptRB.y, ptLB.y});
 
  std::cout << "pt min: (" << ptMin.x << ',' << ptMin.y << ")\n";
  std::cout << "pt max: (" << ptMax.x << ',' << ptMax.y << ")\n";
 
  return 0;
}
 

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