Grokking the Coding Interview: Patterns for Coding Questions
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Solution: Top 'K' Frequent Numbers

Problem Statement

Given an unsorted array of numbers, find the top ‘K’ frequently occurring numbers in it.

Example 1:

Input: [1, 3, 5, 12, 11, 12, 11], K = 2
Output: [12, 11]
Explanation: Both '11' and '12' apeared twice.

Example 2:

Input: [5, 12, 11, 3, 11], K = 2
Output: [11, 5] or [11, 12] or [11, 3]
Explanation: Only '11' appeared twice, all other numbers appeared once.

Constraints:

  • 1 <= nums.length <= 10<sup>5</sup>
  • -10<sup>5</sup> <= nums[i] <= 10<sup>5</sup>
  • k is in the range [1, the number of unique elements in the array].

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