Merge k Sorted Lists

Challenge Points: 30

Level: Hard

You are given k sorted linked lists. Your task is to merge all of them into one sorted linked list.

Input: lists = [[2,5,7],[1,3,6],[4,8]]

Output: [1,2,3,4,5,6,7,8]

Explanation:

The linked-lists are: 2->5->7 1->3->6 4->8 After merging: 1->2->3->4->5->6->7->8

Input: Input: lists = []

Output: []

Input: lists = [[]]

Output: []

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