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How to Solve Reduce Array Size to The Half Problem
Master the Reduce Array Size to The Half LeetCode problem with undetectable real-time assistance. Get instant solutions and explanations during your coding interviews.
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Start Free for WindowsMedium#1338
LeetCode ProblemReduce Array Size to The Half
You are given an integer array arr. You can choose a set of integers and remove all the occurrences of these integers in the array. Return the minimum size of the set so that at least half of the integers of the array are removed.
ArrayHash TableGreedySortingHeap (Priority Queue)
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Problem Breakdown
Understanding the Reduce Array Size to The Half Problem
Let's break down this LeetCode problem and understand what makes it challenging in interview settings.
Problem Statement
You are given an integer array arr. You can choose a set of integers and remove all the occurrences of these integers in the array. Return the minimum size of the set so that at least half of the integers of the array are removed.
MediumProblem #1338
LeetCodeReduce Array Size to The Half
Related Topics
ArrayHash TableGreedySortingHeap (Priority Queue)
How Phantom Code Helps
Get real-time assistance for Reduce Array Size to The Half problems during coding interviews. Phantom Code provides instant solutions and explanations.
Examples
# Example 1
Input
arr = [3,3,3,3,5,5,5,2,2,7]
Output
2
# Example 2
Input
arr = [7,7,7,7,7,7]
Output
1
Constraints
2 <= arr.length <= 105
arr.length is even.
1 <= arr[i] <= 105
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Solve Reduce Array Size to The Half — You are given an integer array arr. You can choose a set of integers and remove ...
Here's the optimal approach using Array:
def solve(input):
# Optimal O(n) solution
return result
Time: O(n) | Space: O(n)
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Frequently Asked Questions
Common questions about solving Reduce Array Size to The Half and using Phantom Code during coding interviews.
How does Phantom Code help me solve coding problems like Reduce Array Size to The Half during interviews?
Phantom Code generates complete solutions instantly with proper complexity analysis, letting you focus on explaining your approach and demonstrating problem-solving skills rather than getting stuck on implementation details during high-pressure situations.
What if the interviewer asks follow-up questions or modifications to problems like Reduce Array Size to The Half?
Phantom Code adapts in real-time. Screenshot the modified problem or use audio mode to capture the interviewer's follow-up, and get an updated solution within seconds — including edge cases and optimizations.
Can Phantom Code help me communicate my solution for problems like Reduce Array Size to The Half?
Yes. Phantom Code provides step-by-step approach explanations with 3 progressive thoughts, so you can walk through your solution naturally. It also provides time and space complexity analysis to discuss trade-offs.
How does Phantom Code assist with different programming languages for Reduce Array Size to The Half type problems?
Phantom Code supports 11 programming languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set your preferred language and get idiomatic solutions.
What coding mistakes does Phantom Code help me avoid during Reduce Array Size to The Half interviews?
Phantom Code catches common mistakes like off-by-one errors, missing edge cases, incorrect base conditions, and suboptimal approaches. It provides clean, well-structured code that handles all edge cases.
Is Phantom Code detectable when solving problems like Reduce Array Size to The Half during live interviews?
No. Phantom Code runs as an invisible desktop overlay that doesn't appear in screen shares, recordings, or proctoring software. It works with Zoom, HackerRank, CodeSignal, CoderPad, and all major platforms.
How does Phantom Code help when I'm struggling with Reduce Array Size to The Half style questions under pressure?
The AI provides structured guidance: first the approach (what algorithm/data structure to use and why), then the implementation with clean code, and finally complexity analysis. This helps you think clearly even under pressure.
Does Phantom Code work for the coding platforms used in Reduce Array Size to The Half interviews?
Yes. Phantom Code works with all major coding platforms including LeetCode, HackerRank, CodeSignal, CoderPad, HackerEarth, and any browser-based coding environment.
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