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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.
was frustrating for me too, but I think it's a good Kata.
The explanation can be better and the images don't help so much, but the question is nice for practice.
U need much more mathematics than algorithm