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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.
Count of permutations? How do you mean? This is designed to use skyscaper problems with only one solution.
Hey Crastinus. Thank you for the feedback.
You reminded me I had meant to update this task for a while, so I have rewritten the test cases to extend up to 15x15 and to improve the difficulty. Could you have another go and tell me if its a meaningful improvement?