Class cmpy

code/geometry/closest_pair.cpp:7–10

    return abs(real(a) - real(b)) > EPS ?
      real(a) < real(b) : imag(a) < imag(b); } };
struct cmpy { bool operator ()(const point &a,
                               const point &b) const {
  return abs(imag(a) - imag(b)) > EPS ?
      imag(a) < imag(b) : real(a) < real(b); } };
double closest_pair(vector<point> pts) {
  sort(pts.begin(), pts.end(), cmpx());
  set<point, cmpy> cur;