Maximum Twin Sum of a Linked List - LeetCode
leetcode.com/problems/maximum-twin-sum-of-a-linked-list/editorial/
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We need three pointers: a) nextNode, to hold the next node so that when we reverse the next pointer of the previous node, we have access to the next node, b) slow, the node under consideration whose next must be set to the previous node, and c) prev, the previous node.
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