Top K Frequent Elements
Explore how to identify the top K most frequent elements in an integer array by applying heaps and frequency counting methods. This lesson helps you develop efficient solutions for common interview patterns by understanding constraints, reasoning about problem statements, and implementing your approach in practice.
We'll cover the following...
Statement
Given an array of integers, arr, and an integer, k, return the most frequent elements.
Note: You can return the answer in any order.
Constraints:
-
arr.length -
arr[i] - 1
knumber of unique elements in an array. - It is guaranteed that the answer is unique.
Examples
Understand the problem
Let’s take a moment to make sure you’ve correctly understood the problem. The quiz below helps you check if you’re solving the correct problem:
Top K Frequent Elements
What is the output if the following inputs are given?
arr = [1, 1, 2, 4, 5, 5]
k = 2
[1]
[5]
[1, 5]
[1, 2]
Figure it out!
We have a game for you to play. Rearrange the logical building blocks to develop a clearer understanding of how to solve this problem.
Try it yourself
Implement your solution in the following coding playground:
vector<int> TopKFrequent(vector<int> lists, int k){// Replace this placeholder return statement with your codereturn {};}