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How to Solve Maximum Product Subarray Problem

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Medium#152
LeetCode Problem

Maximum Product Subarray

Given an integer array nums, find a subarray that has the largest product, and return the product. The test cases are generated so that the answer will fit in a 32-bit integer.

ArrayDynamic Programming

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Problem Breakdown

Understanding the Maximum Product Subarray Problem

Let's break down this LeetCode problem and understand what makes it challenging in interview settings.

Problem Statement

Given an integer array nums, find a subarray that has the largest product, and return the product. The test cases are generated so that the answer will fit in a 32-bit integer.

MediumProblem #152
LeetCode

Maximum Product Subarray

Related Topics

ArrayDynamic Programming

How PhantomCodeAI Helps

Get real-time assistance for Maximum Product Subarray problems during coding interviews. PhantomCodeAI provides instant solutions and explanations.

Examples

# Example 1

Input
nums = [2,3,-2,4]
Output
6

# Example 2

Input
nums = [-2,0,-1]
Output
0

Constraints

1 <= nums.length <= 2 * 104
-10 <= nums[i] <= 10
The product of any subarray of nums is guaranteed to fit in a 32-bit integer.

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Solve Maximum Product Subarray — Given an integer array nums, find a subarray that has the largest product, and r...

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 Maximum Product Subarray and using PhantomCodeAI during coding interviews.

How does PhantomCodeAI help with LeetCode problems during a coding interview?
PhantomCodeAI reads the problem from a screenshot or listens to it via audio, then generates a complete solution with a step-by-step approach and time/space complexity, so you can focus on explaining your reasoning rather than getting stuck on implementation.
Which programming languages does PhantomCodeAI support?
11 languages including Python, Java, C++, JavaScript, TypeScript, Go, Rust, Ruby, Swift, Kotlin, and C#. Set a preferred language to get idiomatic solutions.
Does PhantomCodeAI work with HackerRank, CodeSignal, and CoderPad?
Yes — it works alongside LeetCode, HackerRank, CodeSignal, CoderPad, and HackerEarth, plus any browser-based coding environment.
Can PhantomCodeAI handle follow-up questions and modifications?
Yes. Capture the modified problem by screenshot or audio and get an updated solution within seconds, including new edge cases and optimizations.
Is PhantomCodeAI detectable during live interviews?
PhantomCodeAI runs as a native desktop overlay that does not appear in screen shares, recordings, or proctoring software, and works with Zoom, Google Meet, Microsoft Teams, and major coding platforms.
Should I still practice these problems on my own first?
Yes. The most durable preparation is solving problems unaided first, then using AI afterward to review your approach, complexity, and missed edge cases — use it to debrief and learn, not to skip the reps.

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