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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 takes 1 line of code to solve in python/c++ (dont know about the other languages.) great kata!
btw this is kinda similar to the gaussian formula xD