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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.
Be careful with solutions like this because you are iterating through nums for each element of nums making it O(n^2) time complexity. This gets very slow as the size of nums grows. You can accomplish the same result by iterating through nums only once or twice. Obviously for these test cases nums isn't long enough to matter though.
Cheers!