zoj1041 Transmitters

/* ***********************************************
Author        :xryz
Email         :[email protected]
Created Time  :4-4 10:03:00
File Name     :Transmitters.cpp
************************************************ */

#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
#include 
using namespace std;

bool dis(double x1,double y1,double x0,double y0,double r)
{
    double sum=(x1-x0)*(x1-x0)+(y1-y0)*(y1-y0);
    if(sum>r) return 0;
    return 1;
}

bool fnc(double x1,double y1,double x2,double y2)
{
    double t=x1*y2-x2*y1;
    if(t<=0) return 1;
    return 0;
}
int main()
{
    double x0,y0,r,x[160],y[160],in[160];
    int sum,ans,i,n,j;
    while(~scanf("%lf %lf %lf",&x0,&y0,&r))
    {
        if(r<0) break;
        r=r*r;
        ans=0;
        memset(in,0,sizeof(in));
        scanf("%d",&n);
        for(i=0;iscanf("%lf%lf",&x[i],&y[i]);
            in[i]=dis(x[i],y[i],x0,y0,r);
        }
        sum=0；
        for(i=0;iif(in[i])
            {
                sum=0;
                for(j=0;j//if(i==j) continue;
                    if(in[j])
                    {
                        if(fnc(x[i]-x0,y[i]-y0,x[j]-x0,y[j]-y0))
                            sum++;
                    }
                }
                if(sum>ans) ans=sum;
            }
        }
        printf("%d\n",ans);
    }
    return 0;
}