Top K Frequent Elements
Given a non-empty array of integers, return the k most frequent elements.
Given [1,1,1,2,2,3] and k = 2, return [1,2].
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.
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