#include<iostream>
#include<algorithm>
#include<cstring>
#include<cstdio>
#define mk make_pair
#define point pair<int,int>
#define line pair<point,point>
#define x first
#define y second
using namespace std;
int n,m,x1,y1,x2,y2,ans[5001],num[5001];
line l[5000];
bool cmp(line a,line b){
return a.x.x<b.x.x;
}
point sub(point a,point b){
return mk(a.x-b.x,a.y-b.y);
}
int cmul(point a,point b){
return a.x*b.y-b.x*a.y;
}
int turn(point a,point b,poin......
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