using System;
public class Program
{
public static void Main()
int[] randomArray = new int[50];
Random r = new Random();
for (int i = 0; i < randomArray.Length; i++)
randomArray[i] = r.Next(0, Math.Max(21, randomArray.Length));
for (int j = 0; j < i; j++)
if (randomArray[j] == randomArray[i])
i--;
break;
}
Console.WriteLine("[{0}]", string.Join(", ", randomArray));