Nope

Do you have any advice? Seems to me impossible to solve in O(n).

I do not choose the rank and it cannot be changed. I think 6 kyu is fine for this one though. The kata description does not have to explain how to do X or Y in a given programming language, it is up to the codewarrior to research that. Thanks for the kind words though :)

how about this

Not a kata issue.

If anyone dares to provide Chuck with an empty string, an integer or an array, just return a description of their face once Chuck finds out: 'Broken!'

what is your code? spoiler