using System;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        int[] arrayWithDuplicates = { 10, 20, 30, 20, 10, 50, 60, 40, 80, 50, 40 };

        int[] arrayWithoutDuplicates = RemoveDuplicates(arrayWithDuplicates);

        Console.WriteLine("Array with duplicates: " + string.Join(", ", arrayWithDuplicates));

        Console.WriteLine("Array without duplicates: " + string.Join(", ", arrayWithoutDuplicates));

    }

​

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

    {

        // Use a HashSet to keep track of unique elements

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

        // List to store the result without duplicates

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

        // Iterate through the array

        foreach (int element in array)

        {

            // If the element is not in the HashSet, add it to the result and HashSet

            if (uniqueElements.Add(element))

            {

                result.Add(element);

            }

        }

​

        // Convert the List to an array

        return result.ToArray();

    }

}