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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.
be aware of the high voted "solutions" in this question. They are just workable in the very loose condition provided in the test cases of this question.
aggregating the whole list of odd number and even number is short but expensive.
not the best time and memory efficiency
It is not working again