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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.
O(n^2)
I'm not convinced that using Big Int is a good solution because of memory usage, but i'm curious of advantages like being easier to code than other solutions. It's probably faster than many too.