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Grokking the Coding Interview Patterns

Solution: Reverse Nodes in Even Length Groups

Understand how to reverse nodes in each even-length group of a linked list by manipulating pointers directly without extra storage. This lesson guides you through identifying group boundaries, reversing even groups, and reconnecting the list efficiently with in-place operations.

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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...).

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