poj2405

几何公式

#include <iostream>

#include <cstdlib>

#include <cstdio>

#include <cstring>

#include <cmath>

using namespace std;



#define pi acos(-1)



int D, V;



int main()

{

    while (scanf("%d%d", &D, &V), D | V)

    {

        printf("%.3f\n", pow(D * D * D - 6 * V / pi, 1.0 / 3));

    }

    return 0;

}

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