using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        HashSet<int> h = new HashSet<int>();

        SortedSet<int> ss = new SortedSet<int>();

        var num = 18;

        for (int i = 0; i < num; i++)

        {

            h.Add(i);

            ss.Add(i);

        }

​

        var data = Enumerable.Range(0, num).Append(17);

        var hashSetEquals = h.SetEquals(data);

        var sortedSetEquals = ss.SetEquals(data);

        Console.WriteLine(hashSetEquals);

        Console.WriteLine(sortedSetEquals);

        // balance set

        ss = new SortedSet<int>(ss.ToList());

        sortedSetEquals = ss.SetEquals(data);

        Console.WriteLine("Balanced SortedSet:");

        Console.WriteLine(sortedSetEquals);

    }

}