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Grokking the Coding Interview Patterns in Python

Solution: Merge K Sorted Lists

Understand how to merge multiple sorted linked lists into one sorted list by applying a divide-and-conquer approach. This lesson teaches merging pairs of lists step-by-step, using pointers and dummy nodes to build the final list efficiently.

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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

  • 0≤0 \leq k ≤103\leq 10^3

  • 0≤0 \leq lists[i].length ≤500 ...