HDU 3349-lazy gege

#include<iostream>
#include<cmath>
#include<cstdio>
using namespace std;

int main(){
    int t;
    double a,b,l,sl;
    double s;
    cin>>t;
    while(t--){
        cin>>l>>a>>b;
        b=b<a?b:a;
        sl=sqrt(l*l*2);
        if(b<=sl){
            s=b*b/4.0;
            //cout<<"one"<<b<<" "<<sl<<endl;
        }
        else{
            if(b/2.0<sl){
                double h=sl-b/2.0;
                //int h=sl-b/2.0;//错在把h类型写错了，然后调试n久没看到 
                //cout<<"h: "<<h<<endl;
                s=l*l-h*h;
            }
            else{
            //  cout<<"three"<<endl;
                s=l*l;
            }
        }
        printf("%.4lf\n",s);
    }
    return 0;
}