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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 think there is a simpler way: for any integer[i], just check its sum with [i - 1] and [i - 2] for an odd number, since the array size is at least 3. We cannot use i + 1 because of the last integer would have out of range problem.
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