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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.
I've marked your last comment as spoiler. I think Math.pow uses doubles, and there might be some truncation errors or something.
your solution timing out is not a kata issue
What is the problem?!?!?!