# Day 17 of July LeetCode Challenge

1 min readJul 18, 2020

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Given a non-empty array of integers, return the ** k** most frequent elements.

**Example 1:**

**Input: **nums = [1,1,1,2,2,3], k = 2

**Output: **[1,2]

**Example 2:**

**Input: **nums = [1], k = 1

**Output: **[1]

**Note:**

- You may assume
*k*is always valid, 1 ≤*k*≤ number of unique elements. - Your algorithm’s time complexity
**must be**better than O(*n*log*n*), where*n*is the array’s size. - It’s guaranteed that the answer is unique, in other words, the set of the top k frequent elements is unique.
- You can return the answer in any order.