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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.
This comment is hidden because it contains spoiler information about the solution
If I understand well you passed the tests in "Your example test cases" but not when you "submit". It can be because there are a lot of tests in "submit" (120) but only 5 in "Your test cases" and then you have a "timing out". Either CW is a bit too busy or your code is too slow. I just tried and it took me 4000 milliseconds. Try again and tell me if you succeed or not.
Which language?
Good!
Can you please be more precise? Which language? What is the problem? Fixed tests or random tests? Are you timing out? Don't forget to mark as spoiler when you post code:-)