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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.
This code is simple and easy to understand!
My code also timed out…… So sad
Thank you for your answer!
Actually, I don't quite understand res[-1]……