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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.
I thought the parity question would make it different enough to be worthwhile/interesting, at least for beginners. Apologies if not.
Strong agree. The problem it is equivalent to is 7 kyu, but unless you know that (or realise it quickly)...
This is really a maths problem (and not an easy one), not a coding one. It says nothing about your abilities as a programmer.
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