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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.
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that difference would be negative, thus not equal to zero
My solution was very similar, and honestly I smacked my head when I realized I could have just used sets.
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List
is the worst option...This comment is hidden because it contains spoiler information about the solution
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Your solution is not much better. It's linear, but neither optimal for arrays with few duplicates nor for arrays with many duplicates.