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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 don't think your solution is O(n). It uses
Array.appendwhich creates a copy of the input array, which is O(n) already. Enclosed in an O(n) recursion, your solution seems to be more line O(n^2).Please don't post solution code in the discourse without the spoiler flag.
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