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#include<cstdio>
#include<cstdlib>
#include<ctime>
#include<cstring>
#include<cmath>
#include<malloc.h>
#include<algorithm>
#include<queue>
#include<stack>
#include<vector>
#include<deque>
#include<list>
#include<map>
#include<set>
#include<string>
#include<fstream>
#include<iostream>
#define me(x) memset(x,0,sizeof(x))
#define sy system("pause")
using namespace std;
struct point
{
    double x,y;
    point(double x=0,double y=0):x(x),y(y){}
    bool operator<(const point& X)const
    {
        if (x<X.x) return 1;
        if (x>X.x) return 0;
        return y<X.y;
    }
    point operator-(const point& X){return point(x-X.x,y-X.y);}
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