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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.
Great challenge. It took me 40 minutes but figure out the result.
I liked the question. It took a little thinking to check the triangular. It's not an easy question. Therefore, it should be qualified as kyu 6. Furthermore, this question is not clear as to what is represented by the key or the value.