#include <cstdio>
#include <cmath>
#include <cstdlib>
#define PI 3.1415926535897932384626433
int main()
{
	double x1,y1,r1,x2,y2,r2;
	while(scanf("%lf%lf%lf%lf%lf%lf",&x1,&y1,&r1,&x2,&y2,&r2)!=EOF)
	{
		double distance=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
		if(r1+r2<distance)printf("0.000\n");
		else if(abs(r2-r1)>=distance)
		{
			if(r2>=r1)printf("%.3lf\n",PI*r1*r1);
			else printf("%.3lf\n",PI*r2*r2);
		}
		else
		{
			double angle1=2*acos((r1*r1+distance*distance-r2*r2)/2/r1/distance);
			double angle2=2*acos((r2*r2+distance*distance-r1*r1)/2/r2/distance);
			double ans=r1*r1*angle1/2+r2*r2*angle2/2-r1*r1*sin(angle1)/2-r2*r2*sin(angle2)/2;
			printf("%.3lf\n",ans);

	}
	return 0;
}

• Re:我晕，我又遇到这种g++wrong，c++ 却ac的情况了 (775) 2013014243 2014-08-12 13:40:27
• Re:我晕，我又遇到这种g++wrong，c++ 却ac的情况了 (16) TCM_zhangpeng 2015-04-04 10:16:50