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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.
Is the output meant to be a random square of size nxn? This is actually a complex mathematical problem, and then add to that the computational problem of finding a algorithm efficient enough so that it won't time out at high values of n; the ranking of this problem as 7kyu feels way too low. Unless we're just meant to submit a non-random square. If that's the case please clarify.