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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.
You're totally right. This code will work very slow with big values. Rewrote the code whith one "for" loop. Big thanks for your comment ;)
nested loops can hurt and should be avoided when possible. i think that portion of the solution ends up being O(n^2).