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Solution: Smallest Range Covering Elements from K Lists

Explore how to identify the smallest range that includes at least one element from each of K sorted integer lists. This lesson guides you through using a min heap to dynamically track minimum and maximum values, enabling you to efficiently narrow down the range while maintaining one element from each list. You'll learn to implement this approach with attention to time and space complexity, preparing you to solve similar top K element problems in coding interviews.

Statement

You are given kk sorted lists of integers, nums, where each list in nums is in non-decreasing order. Your task is to find the smallest range that contains at least one element from each of the kk lists.

A range [a,b][a,b] is considered smaller than another range [c,d][c,d] if ...