Merge K Sorted Lists

Prereq: Heap Fundamentals

Given k sorted lists of numbers, merge them into one sorted list.

Input: [[1, 3, 5], [2, 4, 6], [7, 10]]

Output: [1, 2, 3, 4, 5, 6, 7, 10]

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  >>> a = [1, 2, 3]
  >>> a[-1]

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