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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.
@Renich: you passed, good!
Please see the FAQ I linked, there you can find some hints on printing, flushing (can be important), and other things related to debugging your solution.
If I were to guess, I'd say you are testing only small inputs. Do you know how many tests you pass before timeout? Add some printing to your solution (see here how) and check how far you get.