HDU 2368 Alfredo's Pizza Restaurant

http://acm.hdu.edu.cn/showproblem.php?pid=2368

初中数学题，圆幂定理

#include <iostream>
using namespace std ;
int main()
{
    double r,w,l;
    int nCase=1;
    while(scanf("%lf",&r),r)
    {
        scanf("%lf%lf",&w,&l);
        if(r*r-(w/2)*(w/2)<(l/2)*(l/2))
            printf("Pizza %d does not fit on the table.\n",nCase++);
        else
            printf("Pizza %d fits on the table.\n",nCase++);
    }
    return 0;
}