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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.
It's not a performance kata, but it deserves at least a 6 kyu in my opinion. I solved it in JS and it demanded "more advanced" functionalities not to time out. I encountered 6 kyu katas much much easier than this one.
seeing this, after submitting my overcomplicating my solution, makes me want to cry :D
you lost me at i<300000000... so much hard work into this... I like your determination :D