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Practice: Smallest Range of K Lists

This one is a bit tougher so don't feel bad if you don't finish. Again: the point is to demonstrate your thinking process and that you ask enough questions and think things through before you write any code.

Here’s the question:

You have k lists of sorted integers. Find the smallest range that includes at least one number from each of the k lists.

Here's some sample code

// For example,
list1 = [4, 10, 15, 24, 26];
list2 = [0, 9, 12, 20];
list3 = [5, 18, 22, 30];