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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.
There are 11 non random tests with a few "big" (order of 10^6) numbers and 10 random ones without "big" numbers. I don't see the need for a sort. If you time out maybe it's because Codewars is too busy or because your algorithm is too slow, I am unable to know...