pku2610.cpp

这是ACM 方面的资料 是PKU的 北京大学的出来的

#include "stdio.h"
int main()
{
	double x0,y0,x1,y1,dis1,dis2;
	double holex,holey;
	int flag;
	scanf("%lf%lf%lf%lf",&x0,&y0,&x1,&y1);
	flag=0;
	while(scanf("%lf%lf",&holex,&holey)!=-1)
	{
		dis1=(x0-holex)*(x0-holex)+(y0-holey)*(y0-holey);
		dis2=(x1-holex)*(x1-holex)+(y1-holey)*(y1-holey);
		if(dis1*4<dis2&&flag==0)
		{
			printf("The gopher can escape through the hole at (%.3f,%.3f).\n",holex,holey);
			flag=1;	
		}	
	}
	if(flag==0)printf("The gopher cannot escape.\n");
}