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Hehe,我开始也是这样WA了很多次,加了一句就AC了In Reply To:哪位帮我看看，wa了10次了，真不知道还有什么没考虑到 Posted by:radish at 2005-08-10 18:03:14
#include<iostream.h>
#include<math.h>
#include<iomanip.h>
int main()
{
double x1,y1,a,x2,y2,b,c,s,A,B,area;
while(cin>>x1>>y1>>a>>x2>>y2>>b)
{
if(a<b)c=a,a=b,b=c;
c=sqrt((x1-x2)*(x1-x2)+(y1-y2)*(y1-y2));
if(c>=a+b){area=0;goto out;}//外离或相切
if(c<=a-b){area=3.1415926*b*b;goto out;}//内含
A=acos((b*b+c*c-a*a)/2/b/c);//相交
B=acos((a*a+c*c-b*b)/2/a/c);
s=(a+b+c)/2;
s=sqrt(s*(s-a)*(s-b)*(s-c));
area=a*a*B+b*b*A-2*s;
out: area=floor(area*1000+0.5)/1000;//加上这一句
cout<<setiosflags(ios::fixed)<<setprecision(3)<<area<<endl;
}
return 1;
}
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