【題解】ZeroJudge a995. 10287 – Gifts in a Hexagonal Box

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

int main() {
    double S;
    while (cin >> S){
        cout << fixed << setprecision(10);
        // r1
        cout << sqrt(3.0) / 2.0 * S;
        // r2
        cout << " " << (2.0 * sqrt(3.0) - 3.0) * S;
        // r3
        cout << " " << sqrt(3.0) / 4.0 * S;
        // r4
        double a = 5.0 / 3.0;
        double b = 7.0 / sqrt(3.0) * S;
        double c = -7.0 / 4.0 * S * S;
        cout << " " << (-b + sqrt(b*b - 4.0*a*c)) / (2.0*a);
        cout << "\n";
    }
    return 0;
}

import math
while True:
    try:
        S = float(input())
        r1 = math.sqrt(3) / 2 * S
        r2 = (math.sqrt(3) * 2 - 3) * S
        r3 = math.sqrt(3) / 4 * S
        a = 5 / 3
        b = 7 / math.sqrt(3) * S
        c = -7 / 4 * S * S
        r4 = (-b + math.sqrt(b*b - 4*a*c)) / (2*a)
        print(f"{r1:.10f} {r2:.10f} {r3:.10f} {r4:.10f}")
    except:
        break