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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.
Why not though?
Would break for [0, 0, 0, 1]
Try summing up numbers in each row of a triangle and see if you notice any patterns
Boolean expression maps to int which is used as an index to select either value from the list for each tuple in data. Interesting solution but slightly slower than the most upvoted one.