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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 was able to solve it in c# with visual studio but not here.
As many people here have said before it needs some clarity in terms of return type.
It's a list function but the kata says return an int[].
Cool problem though.