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Grokking the Coding Interview Patterns

Solution: Merge K Sorted Lists

Understand the step-by-step divide-and-conquer algorithm to efficiently merge k sorted linked lists into a single sorted list. Explore techniques to pairwise merge lists using two pointers and dummy nodes, while analyzing time complexity O(n log k) and constant space usage.

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Statement

You are given an array, lists, containing k singly linked lists. Each of these linked lists is individually sorted in ascending order.

Your task is to merge all k linked lists into a single sorted linked list in ascending order and return the merged list.

Constraints:

  • k ==== lists.length

  • ...