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Grokking the Coding Interview Patterns

Solution: Top K Frequent Elements

Explore how to identify the top K frequent elements in an array by utilizing frequency counting with hash maps and efficient selection using a min-heap. Understand naive and optimized approaches, their time and space complexities, and how to implement a heap-based algorithm to solve this problem effectively.

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Statement

Given an array of integers, arr, and an integer, k, return the kk most frequent elements.

Note: You can return the answer in any order.

Constraints:

  • 11 ≤\leq arr.length ≤\leq 10310^{3}
  • −10−4-10^{-4} ≤\leq arr[i] ≤\leq 10410^{4}
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