[Poj2398]Toy Storage

#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,point c){
return cmul(sub(b,a),sub(c,a));
}
void search(point p){
int L=1,r=n,mid,t=0;
while(L<=r){
mid=(L+r)>>1;
if(turn(l[mid].x,l[mid].y,p)>=0){
t=mid;L=mid+1;
}
else r=mid-1;
}
ans[t]++;
}
int main(){
while(scanf("%d",&n)&&n){
memset(ans,0,sizeof(ans));
memset(num,0,sizeof(num));
scanf("%d%d%d%d%d",&m,&x1,&y1,&x2,&y2);
for(int i=1;i<=n;i++){
int a,b;scanf("%d%d",&a,&b);
l[i]=mk(mk(a,y1),mk(b,y2));
}
sort(l+1,l+n+1,cmp);
for(int i=1;i<=m;i++){
int a,b;scanf("%d%d",&a,&b);
search(mk(a,b));
}
for(int i=0;i<=n;i++)
num[ans[i]]++;
printf("Box\n");
for(int i=1;i<=n;i++)
if(num[i])printf("%d: %d\n",i,num[i]);
}
return 0;
}