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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.
Happy coding
^_^
Nested loops will timeout, yes. If you can't solve it and as you said you're still new to programming, do more katas (easier ones) first. This one will stump you and naive solutions won't pass because of the performance requirements.
I just fixed it. Please try again ;-)