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Grokking the Coding Interview Patterns in JavaScript

Top K Frequent Elements

Explore how to identify the top K frequent elements in an integer array by implementing efficient algorithms. Understand problem constraints and practice solving this common coding interview question, improving your problem-solving techniques and coding skills.

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Statement

Given an array of integers, arr, and an integer, k, return the kk most frequent elements.

Note: You can return the answer in any order.

Constraints:

  • 11 ≤\leq arr.length ≤\leq 10310^{3}
  • 10−410^{-4} ≤\leq arr[i] ≤\leq 10410^{4}
  • 1 ≤\leq k ≤\leq number 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

1.

What is the output if the following inputs are given?

arr = [1, 1, 2, 4, 5, 5]

k = 2

A.

[1]

B.

[5]

C.

[1, 5]

D.

[1, 2]

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.

Sequence - Vertical
Drag and drop the cards to rearrange them in the correct sequence.
1
2
3
4
5

Try it yourself

Implement your solution in the following coding playground:

JavaScript
usercode > Solution.js
import { MinHeap, MaxHeap } from './Heap.js'



/* The following definition is for MinHeap.



  You can use the same methods for MaxHeap.

  class MinHeap {



    size();          // return number of elements

    peek();          // return top element without removing

    push(val);       // insert element

    pop();           // remove and return top element

  }

*/



function topKFrequent(arr, k){



    // Replace this placeholder return statement with your code

    return []

}



export {

    topKFrequent

}
Top K Frequent Elements