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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 won't work for any values of a or b that are > int.MaxValue. You've effectively created an int version of the method.
While it passes the tests without the Distinct, the instructions mention that duplicates are not allowed in some languages so many people are taking that as instructions to filter out duplicate entries from the first array.