Code:
#include <iostream>
#include<iomanip>

{
    int []unique count = 0;
    int count = 0;
    int []numbers = new int[20];
    int [] uniquenumbers = new int [20];
    console.writeline("enter 20 numbers:");
    for (int i=0; i<numbers.length; i++)
}

{

   try
    {
        console.readline(numbers[i);
    }
    catch
...