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Grokking the Coding Interview Patterns in Python

Smallest Range Covering Elements from K Lists

Explore how to determine the smallest range that covers at least one element from each of k sorted integer lists. Learn to analyze sorted lists, apply the top k elements pattern, and use heaps to solve the problem efficiently. This lesson equips you with practical coding skills to solve range coverage challenges in coding interviews.

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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] ...