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Grokking the Coding Interview Patterns in Go

Solution: Least Number of Unique Integers after K Removals

Understand how to solve the problem of minimizing unique integers remaining in an array after k removals. Explore the use of frequency maps and min heaps to remove the least frequent elements first, optimizing removals. This lesson helps you implement an efficient solution with clear time and space complexity analysis.

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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 ...