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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.
the kata requires to return the first two values (from left) not the nearest: [3,1] is indeed the right solution in your example.
it cant ensure the pair is the nearest, for example: [3, 5, 1, 4, 0], right pair is [4, 0], but got [3, 1]