Top K Frequent Elements
Explore techniques to efficiently find the top K frequent elements in an array. Learn to apply heaps and frequency analysis to solve this common interview problem with clarity and confidence.
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 {};}