Finding duplicate elements

[Ferhat Kurtulmuş]

On Tuesday, 15 August 2023 at 17:59:27 UTC, vino wrote:
> Hi All,
>
>  Request your help in finding duplicate element without sorting 
> as per the below example
>
> ```
> Example:
> string[] args = [" test3", "test2 ", " test1 ", " test1 ", " "];
>
> Output Required:
> If duplicate element found then print "Duplicate element found: 
> <element name>"
> else print ["test3", "test2", "test1"];
> ```
> From,
> Vino.B

Another approach would be using a rbtree as container at the 
first place.