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花花酱 LeetCode 23. Merge k Sorted Lists

Problem

Merge k sorted linked lists and return it as one sorted list. Analyze and describe its complexity.

Example:

Input:
[
  1->4->5,
  1->3->4,
  2->6
]
Output: 1->1->2->3->4->4->5->6

Solution 1: Brute Force

Time complexity: O(nk)

Space complexity: O(1)

C++

Solution 2: Heap / Priority Queue

Time complexity: O(nlogk)

Space complexity: O(k)

C++

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