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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, but O(4N) == O(N), so it's still linear (although inefficient).
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Change one of the base test cases to the one from exercise example and print the population number after each iteration.. Think you guess
So? It's not right. Not a kata issue. See the example in the kata's description, find what you're doing wrong.