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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
same here, i tried some other ideas but none of them worked.
Your code being too slow is not a kata issue, sorry.
It's 5kyu, so you do need an efficient solution, maybe more efficient than you already had.
This article may give you some hints: https://docs.codewars.com/training/troubleshooting