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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.
You are correct. This was a very naive brute force implementation which, while it passed the tests, was computationally super expensive.
Thanks for the feedback, rewriting this was a nice exercise :)
i think this will perform worse as the number gets bigger.