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Grokking the Coding Interview Patterns in C#

Solution: Maximum Twin Sum of a Linked List

Understand how to identify the middle of a linked list with fast and slow pointers, reverse its second half, and calculate the maximum twin sum efficiently. This lesson teaches you a step-by-step approach to solve the problem with O(n) time complexity and O(1) space complexity.

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Statement

In a linked list with an even number of nodes (nn), each node at position ii (using 00−-based indexing) is paired with the node at position (n−1−in - 1 - i). These pairs are called twins for all 0≤i<n/ ...