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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.
Somewhere, a compiler is weeping, but your solution works hopefully!
same!
When you hit "test", your solution is only run against the sample tests that you can see at the bottom of the code editor. When you hit "attempt", your solution is run against a much larger set of tests that aren't visibile to you. You can always print the input to the console to see what the inputs are though.