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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.
No, it isn't. He already solved it, so it must've been an error in his code. Both Java and Python tests are ok.
This comment is hidden because it contains spoiler information about the solution
set it in the clan field in your account settings, and it will create it.
Language? If it's Java:
Doesn't seem to be a problem with it.