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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.
It's best practice to minimize time complexity in case you're dealing with large amounts of data someday.
I don't understand why many have commented that this solution is slow... I also compared their solutions, but this is actually faster or about the same... or is there something I'm not considering?