Какой алгоритм метод сортировки Ruby использует?

Вы можете попробовать следующий код:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
    static void Main(string[] args)
    {
        Console.WriteLine("Please enter how many characters your password will have");
        int num1 = int.Parse(Console.ReadLine());
        int letters = 0;
        int numbers = 0;
        for (int i = 0; i < num1; i++)
        {
            Console.WriteLine("Please enter the character");
            char character = char.Parse(Console.ReadLine());
            if (character >= 'A' && character <= 'Z' || character >= 'a' && character <= 'z')
            {
                letters += 1;
            }
            if(character >= '0' && (int)character <= '9')
            {
                numbers += 1;
            }
            if (character <= 'A' && character >= 'Z' || character <= 'a' && character >= 'z' || character <= '0' && (int)character >= '9')
            {
                Console.WriteLine("you have entered invalid character");
            }
        }
        if(letters >= numbers)
        {
            Console.WriteLine("The password has " + num1 + " characters and its legal");
        }
        else
        {
            Console.WriteLine("The password has " + num1 + " characters and it is illegal");
        }
        Console.ReadLine();
    }
}
}