#include <stdexcept>

class Rectangle
{

    Rectangle(float width, float height)
        : width{width}, height{height}
    {
        if (width / height < 2 || height / width < 2)
        {
            throw std::logic_error("unresonable side difference");
        }
    }

    
    void rotate_90()
    {
        float tmp {width};
        width = height;
        height = tmp;
    }

    bool operator<(Rectangle const& rhs) const
    {
        float left_area { width * height };
        float right_area { rhs.width * rhs.height };
        return left_area < right_area;
    }

private:
    float width;
    float height;
};