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Grokking the Coding Interview Patterns in C++

Smallest Range Covering Elements from K Lists

Explore how to find the smallest possible range containing at least one element from each of k sorted lists. This lesson helps you understand the problem constraints, key strategies for comparing ranges, and how to implement an efficient solution using heaps or frequency methods.

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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] ...