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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.
Exactly, this solution is not clever, and I wouldn't show this solution to impress anyone if I was the author :D
Very cool solution. There is an overflow for n = 31, but very clever indeed
Looks like it's a bad constraint. Should NOT be explained, since it leads to incorrect solutions.