Clone list with random pointers

Q: Clone list with random pointers

This question evaluates a candidate's ability to manipulate complex linked data structures and reason about deep-copy semantics, pointer integrity, time-space trade-offs, and edge cases such as cycles in auxiliary (random) pointers.

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Question

You are given the head of a singly linked list where each node has two pointers: next and random (which may be null or point to any node). Construct a deep copy of the list and return the head of the copy. Aim for O(n) time. Explain both a hash-map approach and an in-place weaving approach that achieves O(

auxiliary space. Discuss handling cycles in random pointers and how you verify structural equality.

Clone list with random pointers

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