A385.球的计算

纯数学手段

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

const double pi=3.14;

int main() {
	double s, t1, t2;
	cin >> s >> t1 >> t2; 
	double V=s/t1*t2, r;
	r = V*3/4/pi;
	r = pow(r, 1.0/3); 
	cout << fixed << setprecision(2) << r;
	return 0;
}