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Given an integer array `nums` and an integer `k`, return the `k` most frequent elements in descending order of frequency. If frequencies match, return any valid order.

Sample Test Cases

Input: [[1,1,1,2,2,3],2]
Expected: [1,2]
Input: [[1],1]
Expected: [1]

Constraints

  • 1 <= nums.length <= 10^5
  • -10^4 <= nums[i] <= 10^4
  • k is in the range [1, the number of unique elements in the array].
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