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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.
True, it works well, and truly readable. Just a line of code!
TBH, IDK. Unless its in the constraints of the test it doesn't concern me. This isn't the real world, I'm not getting paid to do this. It's for fun. For all I know this is total crap, but it works :)
O(n)+O(n) complexity?