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Introduction to Top K Elements

Explore the top K elements pattern to efficiently identify the largest, smallest, or most frequent elements in unsorted datasets. Learn how to use min and max heaps to reduce time complexity and apply this method to real-world problems like ride-sharing and social media trend analysis.

About the pattern

The top k elements pattern is an important technique in coding that helps us efficiently find a specific number of elements, known as kk, from a set of data. This is particularly useful when we’re tasked with identifying the largest, smallest, or most/least frequent elements within an unsorted collection.

To solve tasks like these, one might think to sort the entire collection first, which takes O(nlog(n))O(n \log(n)) time, and then select the top k elements, taking additional O( ...