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Grokking the Coding Interview Patterns in C++

Solution: Top K Frequent Elements

Explore how to solve the Top K Frequent Elements problem by counting frequencies with a hash map and maintaining a min-heap to track the highest frequency elements. Understand the time and space complexity tradeoffs to efficiently return the K most common numbers from an array.

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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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