Test

public static void Run()
        {
            List numbers = new List();
            string line = Console.ReadLine();
            //int item = 0;
            int n = Convert.ToInt32(line);
            if (n > 0)
            {
                for (int i = 0; i < n; i++)
                {
                    line = Console.ReadLine();
                    numbers.Add(line);
                }
            }

            BuildTree(numbers.Distinct().ToList());

            Console.WriteLine(counter);
        }