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Solution: Reverse Nodes in Even Length Groups

Explore how to reverse nodes in groups of even length within a linked list by manipulating pointers in place. This lesson helps you understand how to identify groups by size, reverse nodes using three-pointer technique, and maintain correct list connections. You will learn an optimized solution that works with O(n) time and O(1) space complexity, essential for efficient linked list operations.

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} ...