hdu 3349 lazy gege

#include<stdio.h>
#include<math.h>
int main()
{
    int i;
    double a,b,c,s,t;
    scanf("%d",&i);
    while(i--)
    {
        scanf("%lf%lf%lf",&a,&b,&c);
        if(b>c){s=b;b=c;c=s;}
        t=sqrt(2.0)*a;
        if(t<b/2)
            printf("%.4f\n",a*a);
        else 
        {
            if(t/2<b/2)
                printf("%.4f\n",a*a-(t-b/2)*(t-b/2));
            else 
                printf("%.4f\n",b*b/4);
        }            
    }
    return 0;
}