using System;

using System.Collections.Generic;   

​

public class Program

{

    public static void Main()

    {

        int[] arr1 = new int[]{ 7, 7, 8, 8, 9, 1, 1, 4, 2, 2 };

        int[] distinctArr=RemoveDuplicates(arr1);

        foreach(var i in distinctArr){

            Console.WriteLine(i);

        }

    }

    public static int[] RemoveDuplicates(int[] arr)

{

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

    List<int> list = new List<int>();

​

    foreach (int num in arr)

    {

        if (newArr.Add(num))

        {

            list.Add(num);

        }

    }

​

    return list.ToArray();

}

}