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Grokking the Coding Interview Patterns in Python

Solution: Maximum Twin Sum of a Linked List

Understand how to find the maximum twin sum of an even-sized linked list by using fast and slow pointers to locate the midpoint, reversing the second half of the list, and summing paired nodes. This lesson guides you through implementing an O(n) time and O(1) space solution step by step.

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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/2 ...