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Grokking the Coding Interview Patterns in C#

Least Number of Unique Integers after K Removals

Explore how to minimize the number of unique integers remaining in an array after removing k elements. This lesson helps you apply problem-solving strategies to find the minimum distinct count using frequency analysis and heap usage.

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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  ...