Santas Holiday

using System;

namespace SantasHoliday
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine()) - 1;
            string type = Console.ReadLine();
            string rating = Console.ReadLine();
            double price = 0;

            if (days > 0)
            {
                if (type == "room for one person")
                {
                    price = 18;
                }
                else if (type == "apartment")
                {
                    price = 25;

                    if (days < 10)
                    {
                        price *= 0.7;
                    }
                    else if (days > 15)
                    {
                        price *= 0.5;
                    }
                    else
                    {
                        price *= 0.65;
                    }
                }
                else if (type == "president apartment")
                {
                    price = 35;

                    if (days < 10)
                    {
                        price *= 0.9;
                    }
                    else if (days > 15)
                    {
                        price *= 0.8;
                    }
                    else
                    {
                        price *= 0.85;
                    }
                }

                if (rating == "positive")
                {
                    price *= 1.25;
                }
                else
                {
                    price *= 0.9;
                }

                price *= days;
            }

            Console.WriteLine($"{price:f2}");
        }
    }
}


РЕШЕНИЕ С IF И ТЕРНАРЕН ОПЕРАТОР:

using System;

namespace SantasHoliday
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine()) - 1;
            string type = Console.ReadLine();
            string rating = Console.ReadLine();
            double price = 0;

            if (days > 0)
            {
                price = type == "room for one person" ? 18 : type == "apartment" ? 25 : 35;

                if (days < 10)
                {
                    price *= type == "apartment" ? 0.7 : type == "president apartment" ? 0.9 : 1;
                }
                else if (days > 15)
                {
                    price *= type == "apartment" ? 0.5 : type == "president apartment" ? 0.8 : 1;
                }
                else
                {
                    price *= type == "apartment" ? 0.65 : type == "president apartment" ? 0.85 : 1;
                }

                price *= days * (rating == "positive" ? 1.25 : 0.9);
            }

            Console.WriteLine($"{price:f2}");
        }
    }
}


РЕШЕНИЕ С ТЕРНАРЕН ОПЕРАТОР:

using System;

namespace SantasHoliday
{
    class Program
    {
        static void Main(string[] args)
        {
            int days = int.Parse(Console.ReadLine()) - 1;
            string type = Console.ReadLine();
            string rating = Console.ReadLine();

            double price = days > 0 ? ((type == "room for one person" ? 18 : type == "apartment" ? 25 : 35)
                         * (days < 10 ? (type == "apartment" ? 0.7 : type == "president apartment" ? 0.9 : 1)
                         : days > 15 ? (type == "apartment" ? 0.5 : type == "president apartment" ? 0.8 : 1)
                         : (type == "apartment" ? 0.65 : type == "president apartment" ? 0.85 : 1))
                         * (rating == "positive" ? 1.25 : 0.9) * days) : 0;

            Console.WriteLine($"{price:f2}");
        }
    }
}