close.cpp

#include <iostream>
#include <cmath>
using namespace std;

class Point1 {
    friend float dist(const Point1&,const Point1&);
    friend void close(Point1 *,Point2 *,Point2 *,int,int,Point1&,Point1&,float&);
    friend bool closest(Point1 *,int,Point&,Point1&,float &);
    friend void main();
    public:
    	int operator <= (Point1 a) const
	{return (x <= a.x);}
    private:
	int ID;
	float x,y;
};

class Point2 {
    friend float dist(const Point2&,const Point2&);
    friend void close(Point1 *,Point2 *,Point2 *,int,int,Point1&,Point1&,float&);
    friend bool closest(Point1 *,int,Point1&,Point1&,float &);
    friend void main();
    public:
    	int operator <= (Point2 a) const
	{return (y <= a.y);}
    private:
	int p;
	float x,y;
};

template<class T>
inline float dist(const T& u,const T& v)
{
    float dx=u.x-v.x;
    float dy=u.y-v.y;
    return sqrt(dx*dx+dy*dy);
}