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简单的二分

Posted by xiaorong at 2011-03-30 21:33:52 on Problem 2507 
l=0,r=min(x,y)-0.0001;
while(r-l>eps){
    ans=(l+r)/2.0;
    temp=c/sqrt(x*x-ans*ans)+c/sqrt(y*y-ans*ans);
    if(temp-1<-eps) l=ans+0.0001;
    else if(temp-1>eps) r=ans-0.0001;
    else break;
}
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