LeetCode 23: Merge k Sorted Lists
OG: https://leetcode.com/problems/merge-k-sorted-lists/description/
import java.util.*;
/**
* LeetCode 23: Merge k Sorted Lists
*
* Problem: Merge k sorted linked lists and return it as one sorted list.
*
* Example:
* Input: lists = [[1,4,5]...
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