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Merge k Sorted Lists is a hard coding interview question covering linked lists, heaps — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Merge k sorted linked lists into one sorted linked list and return it. Example: [1->4->5, 1->3->4, 2->6] -> 1->1->2->3->4->4->5->6. Aim for better than O(N*k).
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