DIY: Top K Frequent Elements

Problem statement

You are provided with an array of integers. Return the k most frequent elements.

Input

The input will be an array of integers. The following is an example input:

nums = {1, 3, 5, 14, 18, 14, 5}
k = 2

Output

The output will be an array of the top k frequent numbers. For the above input, the output will be:

{5, 14}

Coding exercise

For this coding exercise, you need to implement the topKFrequent(nums, k) function, where nums is the array of integers and k is the number of frequent elements that need to be returned. The function should return a list of the top k frequent numbers.