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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.
Producing right answer for some cases and wrong answer for other cases doesn't seem concerning to me. That's normal for incorrect solutions.
well, the tests are pointing out some scenarios where wrong answer is being produced. did you test those?
You're phrasing this a bit oddly - "the same problem" - yeah, other people have written incorrect solutions and have failed tests. But knowing whether other people have failed tests, that's not useful information, so you probably mean something other than what you said?