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Least Number of Unique Integers after K Removals

Explore how to remove exactly k elements from an integer array to minimize the count of distinct integers remaining. This lesson helps you understand the use of heaps and frequency counting to solve the problem efficiently, aligning with common top k element challenges in coding interviews.

Statement

You are given an integer array, arr, and an integer, k. Your task is to remove exactly k elements from the array so that the number of distinct integers remaining in the array is minimized. Determine the minimum possible count of unique integers after the removals.

Constraints:

  • 11 \leq arr.length  ...