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Grokking the Coding Interview Patterns in Python

Solution: Reverse Nodes in Even Length Groups

Explore how to reverse nodes in linked lists that are grouped by natural numbers, but only for even-length groups. Understand the in-place algorithm using pointers to efficiently reverse these groups while preserving odd groups. This lesson helps you implement memory-efficient linked list manipulations with linear time complexity.

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Statement

Given the head of a linked list, the nodes in it are assigned to each group in a sequential manner. The length of these groups follows the sequence of natural numbers. Natural numbers are positive whole numbers denoted by (1,2,3,4...)(1,2,3,4...).

In other words:

  • The 1st1^{st} node is assigned to the first group.

  • The 2nd2^{nd} ...