using System;

​

public class Program

{

public static void Main (string[]args)

    {

        int i = 0, j = 0;

        int[] arr1 = new int[]{ 1,2,3,4,2,7,8,8 };

        for (i = 0; i < arr1.Length; i++)

        {

         for (j = 0; j < arr1.Length; j++)

         {

             if (i == j)

             continue;

             if (arr1[j] == arr1[i])

             break;

         }

         if (arr1.Length == j)

         {

             Console.Write (arr1[i] + " ");

         }

​

        }

}

​

}