ural 1874 Football Goal

 #include <cstdio>
 #include <cstring>
 #include <cmath>
 #include <algorithm>
 using namespace std;
 const double eps=1e-;

 double getarea(double a,double b,double c)
 {
     double p=(a+b+c)/2.0;
     return (c*c/+sqrt(p*(p-a)*(p-b)*(p-c)));
 }

 int main()
 {
     double x,y;
     scanf("%lf%lf",&x,&y);
     double l=x+y,r=sqrt(x*x+y*y),s1;
     while(fabs(r-l)>eps)
     {
         double mid1=(r+l)/;
         double mid2=(mid1+l)/;
         s1=getarea(x,y,mid1);
         double s2=getarea(x,y,mid2);
         if(s1>s2)
         l=mid2;
         else
         r=mid1;
     }
     printf("%.9lf\n",s1);
     return ;
 }