Merge Two Sorted Lists

Q: Merge Two Sorted Lists

This question evaluates proficiency with linked list data structures, pointer manipulation, in-place merging of sorted sequences, and general algorithmic reasoning within the Coding & Algorithms domain.

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Question

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You are given the heads of two singly linked lists, each already sorted in non-decreasing order. Merge them into one sorted linked list and return the head of the merged list.

Requirements:

Reuse the existing nodes if possible.
The output must also be sorted in non-decreasing order.
Handle the case where one or both input lists are empty.

Example:

List A: 1 -> 2 -> 4
List B: 1 -> 3 -> 4
Output: 1 -> 1 -> 2 -> 3 -> 4 -> 4

Merge Two Sorted Lists

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