Problem 21: Rotate List[Facebook/Meta]

Lists, Rotation, Array Functions, Pattern Finding

Problem

This problem was asked by Facebook/Meta.

Write a function that rotates a list by k elements. For example, [1, 2, 3, 4, 5, 6] rotated by two becomes [3, 4, 5, 6, 1, 2]. Try solving this without creating a copy of the list. How many swap or move operations do you need?

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