【題目敘述】https://vjudge.net/problem/UVA-10297
【解題想法】
- 注意:https://zerojudge.tw/ShowProblem?problemid=d174
- 在ZeroJudge上有一筆測資,會有小數第三位錯誤的情形

#include <iostream>
#include <iomanip>
#include <cmath>
using namespace std;
const double PI = acos(-1.0);
int main() {
double D, V;
while (cin >> D >> V){
if (D == 0 && V == 0) break;
double l = 0.0;
double r = D;
double ans;
while (r - l > 1.0e-5){
double d = (l+r) * 0.5;
if (PI*D*D*D - PI*d*d*d > 6.0*V){
ans = d;
l = d;
} else {
r = d;
}
}
cout << fixed << setprecision(3) << ans << "\n";
}
return 0;
}