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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.
Good point, but you are basically using the same approach. Hence the time complexity of your solution isn't perfect as well.
Красиво!
Но не понятно! )))
great challenge! took me almost two days to complete... I'd thought it would be easier