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Solution: Least Number of Unique Integers after K Removals

Explore how to minimize the number of unique integers remaining after removing exactly k elements from an array. Learn to identify and remove the least frequent elements first using a min heap, enabling efficient selection and optimal reductions of unique values.

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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:

  • 1≤1 \leq arr.length ≤103\leq 10^3

  • 1≤1 \leq arr[i] ≤105\leq 10^5 ...