include iostream include math using namespace std class GoldenRatio pr

#include <iostream>
#include <math.h>

using namespace std;

class GoldenRatio {
private:
    static const double phi = 1.61803; // (1 + sqrt(5)) / 2
public:
    double static f(double x) {
        return (x + 1) * (x + 1) * (x + 1) + 5 * x * x;
    }

    double static min(double a, double b, double e){
        double x1, x2;
        while (true){
            x1 = b - (b - a) / phi;
            x2 = a + (b - a) / phi;
            if (f(x1) >= f(x2))
                a = x1;
            else
                b = x2;
            if (abs(b - a) < e)
                break;
        }
        return (a + b) / 2;
    }

    double static max(double a, double b, double e){
        double x1, x2;
        while (true){
            x1 = b - (b - a) / phi;
            x2 = a + (b - a) / phi;
            if (f(x1) <= f(x2))
                a = x1;
            else
                b = x2;
            if (abs(b - a) < e)
                break;
        }
        return (a + b) / 2;
    }
};

int main() {
    cout << GoldenRatio::min(-2, 2, 0.01);
}