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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.
Seriously. The description makes it seem like the algorithmic complexity isn't a factor. I would have approached this problem completely differently if I'd known the "relatively small" n would timeout. A bit frustrating to be honest, especially considering how many comments are pointing this out.