Duplicate: https://www.codewars.com/kata/581d1d669ae06274d5000074

It's a solution who most people don't understand.
short, yes. smart, yes. clever, yes. but not best practices.

I like that you explain the solution :)

Issue resolved. Thanks for the kata.

Thanks for your issue, this bug has been fixed just now, you can test it again :)

Thanks for the kata, but it appears there is an error in your test cases. Anytime strng.length() is 2 and k=2, it appears your tests are incorrect.

Examples

findPerm ~ strng:(vu)  k:(2) ~~> return(vu)
expected:<[uv]> but was:<[vu]>

findPerm ~ strng:(og)  k:(2) ~~> return(og)
expected:<[go]> but was:<[og]>

that kata is too hard for me now :( but I am glad to read your comment, which is first discourse in my first kata ;)

Not a duplicate, but it's pretty much the inverse problem of this kata :)

could somebody explain this solution? any help will be appreciated.

@JustyFY But in Java, you put a List as the parameter, so it's neccessary to import List, isn't it?