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Grokking the Coding Interview Patterns

Solution: Rotate List

Understand how to rotate a singly linked list to the right by k positions efficiently. This lesson teaches you to compute the list length, make it circular, and break it at the correct node to achieve rotation in linear time with constant space. You'll master handling edge cases and optimizing linked list manipulations.

We'll cover the following...

Statement

You are given the head of a singly linked list and a non-negative integer k. Your task is to rotate the list to the right by k positions.

A right rotation by 1 means the last node becomes the new head, and every other node shifts one position to the right.

Return the head of the rotated linked list.

Constraints:

  • The number of nodes in the list is in the range [0, ...