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Challenge Points: 20
Level: MediumYou are given:
• an integer array arr,
• and an integer k.
Your task is to remove exactly k elements from the array such that the number of unique integers remaining is minimized.
Return the least number of unique integers after removing exactly k elements.
Input: arr = [5, 5, 4] k = 1
Output: 1
Input: arr = [4, 3, 1, 1, 3, 3, 2] k = 3
Output: 2
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