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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.
C++ Translation.
Ruby 3.0 should be enabled.
The description should be clearer about invalid input. Is it, that we can expect only ever to get valid input, or should we somehow react on an invalid input array? From my passing the tests without dealing with invalid input, I would expect the former. Only the instructions should say so.