tarawa

const
  zero=1e-6;

var
  n:longint;
  x,y:array [0..10000] of longint;

function cross(a,b,c:longint):longint; inline;
begin
  exit((x[b]-x[a])*(y[c]-y[a])-(x[c]-x[a])*(y[b]-y[a]));

tarawa

var
  m,n,i:longint;
  a:array [0..100,0..3] of longint;

function cross_product(p,q,r:longint):longint;
var
  t1,t2,t3,t4:longint;

begin
  t1:=a[q,1]-a[p,1];

tarawa

type
  xyz=record
        x,y:longint;
        z:char;
      end;

var
  n,i,j,ans,max,left,right,mleft,mright,k:longint;
  f:array [0..10010] of boolean;
  origin:array [0..10010] of xyz;

tarawa

type
  pq=record
       p,q:longint;
     end;

var
  n,i,k,ans,temp,top:longint;
  x,y:array [0..10000] of longint;
  stack:array [0..10000] of pq;
  t:pq;

tarawa

#include <stdio.h>
#include <algorithm>

using namespace std; 

struct vec {
  int x,y;
};

struct line {

tarawa

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tarawa

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tarawa

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tarawa

type
  point=record
          x,y:longint;
        end;

const
  maxn=1000;

var
  a:array [0..maxn] of point;

tarawa

type
  point=record
          x,y:longint;
        end;

var
  t,i:longint;
  a,stack:array [0..1010] of point;

procedure swap(var p,q:point);