Detect intersection of two linked lists

Q: Detect intersection of two linked lists

This question evaluates a candidate's ability to manipulate singly linked lists, reason about pointer and reference equality between nodes, and perform algorithmic analysis of time and space trade-offs.

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Question

Given two singly linked lists that may converge to share a common tail, determine whether they intersect and return the first node at which they join. Nodes are compared by reference, not by value. Aim for O(m+n) time and O(

extra space. Describe and implement an approach, justify its correctness, and analyze time and space complexity. Discuss edge cases such as one empty list, no intersection, and very unequal lengths.

Detect intersection of two linked lists

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