using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello Sets!");

        // Elements are added in order

        Console.WriteLine("\nSorted Set");

        SortedSet<string> sortSet = new SortedSet<string>(); // Constructor method can accept and IComparer<T> class to expand the sorting algorithm

        // Can't add same element twice

        sortSet.Add("L");

        sortSet.Add("C");

        sortSet.Add("C");

        sortSet.Add("M");

        //test

        foreach (string elem in sortSet)

            Console.WriteLine(elem);

        // Set of unique elements

        Console.WriteLine("\nAdding Elements");

        HashSet<string> hsSet = new HashSet<string>();

        // Can't add same element twice

        hsSet.Add("L");

        hsSet.Add("C");

        hsSet.Add("C");

        hsSet.Add("M");

        // test

        foreach (string elem in hsSet)

            Console.WriteLine(elem);

        Console.WriteLine("\nUnion");

        HashSet<string> hsAnother = new HashSet<string>();

        hsAnother.Add("Z");

​

        hsSet.UnionWith(hsAnother);

        foreach (string elem in hsSet)

            Console.WriteLine(elem);

    }

}