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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.
coding requires small knowledge of math, even if u don't want to be a graphics engineer
Unless the instruction "Try not to cheat and provide a recursive solution" should be read as an instruction to provide a recursive solution ... I read it as stating that providing a recusive solution is cheating (though don't see why it should be)
Why shouldn't they? The solution works, and is not recursive.