[poj2318]TOYS

题目链接：http://poj.org/problem?id=2318

题目大意：给定一个矩形，矩形被n条线段划分成n+1个区域，给出m个点，求每个区域中有几个点。（具体输入输出看题目去吧）

思路：二分，用叉积判断点在线段左边还是右边，应该是道简单题吧

#include<cstdio>
#include<cstring>
#include<cstdlib>
#include<cmath>
#include<algorithm>
#include<iostream>
#include<string>
#include<ctime>
#include<queue>
#include<map>
#include<set>
#include<vector>
#define sqr(x) (x)*(x)
#define rep(i,x,y) for (int i=(x);i<=(y);i++)
#define per(i,x,y) for (int i=(x);i>=(y);i--)
typedef long long LL;
typedef double DBD;
using namespace std;
const int inf=1e9;
const LL INF=1e18;
const int N=5010;
LL n,m,maxx,minx,maxy,miny,a[N],b[N],Ans[N];
int Write[20];
int read() {int d=0,f=1; char c=getchar(); while (c<'0'||c>'9') {if (c=='-') f=-1; c=getchar();} while (c>='0'&&c<='9') d=(d<<3)+(d<<1)+c-48,c=getchar(); return d*f;}
LL read_LL() {LL d=0,f=1; char c=getchar(); while (c<'0'||c>'9') {if (c=='-') f=-1; c=getchar();} while (c>='0'&&c<='9') d=(d<<3)+(d<<1)+c-48,c=getchar(); return d*f;}
void write(int x){int t=0; if (x<0) putchar('-'),x=-x; for (;x;x/=10) Write[++t]=x%10; if (!t) putchar('0'); for (int i=t;i>=1;i--) putchar((char)(Write[i]+48));}
void judge(){freopen(".in","r",stdin); freopen(".out","w",stdout);}
LL cross(LL a,LL b,LL c,LL d,LL e,LL f){return (e-a)*(d-b)-(c-a)*(f-b);}
int main()
{
    //judge();
    while (1)
    {
        n=read_LL();
        if (n==0) break;
        rep(i,0,n) Ans[i]=0;
        m=read_LL(); minx=read_LL(); maxy=read_LL(); maxx=read_LL(); miny=read_LL();
        rep(i,1,n) a[i]=read_LL(),b[i]=read_LL();
        a[++n]=maxx; b[n]=maxx;
        rep(i,1,m)
        {
            LL x=read_LL(),y=read_LL();
            int l=1,r=n,ans=0;
            while (l<=r)
            {
                int mid=(l+r)>>1;
                if (cross(b[mid],miny,x,y,a[mid],maxy)>=0) ans=mid,r=mid-1; else l=mid+1;
            }
            Ans[ans-1]++;
        }
        rep(i,0,n-1) printf("%d: %d\n",i,Ans[i]);
        puts("");
    }
    return 0;
}

被输出格式坑了。。。原来两组输出之间要空行。。。