Product of Array Except Self | Prefix & Suffix Pattern | FAANG Interview Question

In this video, we'll solve LeetCode 238: Product of Array Except Self, one of the most frequently asked Array interview questions in product-based companies and FAANG interviews. At first glance, the problem seems straightforward. Why not simply multiply all the elements and divide by the current element? 🤔 Unfortunately... 🚫 Division is NOT allowed. Even worse, the array can contain zeroes, making the division approach completely invalid. So how do we solve it in O(n) time with no division and only constant extra space (excluding the output array)? In this video, we'll build the intuition from scratch and understand how Prefix Products and Suffix Products help us compute the answer efficiently. We'll visualize every step with dry runs, learn the optimized approach that avoids extra arrays, and finally implement a clean, production-ready Java solution. Instead of memorizing the algorithm, you'll understand why it works, making it much easier to solve similar Array and Prefix-Suffix interview questions. By the end of this video, you'll confidently solve Product of Array Except Self using the optimal approach and recognize one of the most important interview patterns. 🧠 What You Will Learn: ✅ Understanding the problem statement ✅ Why the division approach fails ✅ Handling arrays containing zeroes ✅ Building Prefix Product Array ✅ Building Suffix Product Array ✅ Combining Prefix + Suffix to get the answer ✅ Optimized O(1) Extra Space Solution ✅ Step-by-step Dry Run with Examples ✅ Time & Space Complexity Analysis ✅ Clean Production-Ready Java Code ✅ Common Interview Follow-up Questions 🔥 Interview Questions Covered: ✔ Product of Array Except Self ✔ Prefix Sum / Prefix Product Pattern ✔ Suffix Array ✔ Array Interview Questions ✔ O(n) Algorithm ✔ Constant Extra Space ✔ FAANG Interview Preparation ✔ Coding Interview Patterns 🎬 Complete DSA Playlist: 👉    • DSA for Tech Interviews | Complete Intervi...   📚 Notes & Learning Resources: 👉 https://docs.google.com/document/d/1a... 💻 Full Java Solution on GitHub: 👉 https://github.com/vakeel-labs/java-s... 🌐 Website: 👉 https://codewithvakeel.com 🔗 Problem Link: 👉 https://leetcode.com/problems/product... 🔗 Connect & Join the Community: 💬 WhatsApp Community — Daily DSA Problems, System Design Discussions & Interview Prep 👉 https://chat.whatsapp.com/JWcjsjBH2xx... 💼 LinkedIn 👉   / mohd-vakeel-46702754   💻 GitHub 👉 https://github.com/vakeel-labs ⏱️ TIMESTAMPS: 00:00 Introduction 04:07 Brute Force Solution 04:58 With Division Solution 12:15 Prefix & Suffix Product Array 22:45 Optimal O(1) Extra Space Solution 🚀 If you're preparing for Software Engineer, SDE, Java Developer, Backend Developer, or Product-Based Company Interviews, this is one Array problem you absolutely must master. Don't forget to Like 👍, Share 🚀, and Subscribe 🔔 for more DSA, Java, System Design, Spring Boot, Microservices, Distributed Systems, and Interview Preparation content. #leetcode #LeetCode238 #ProductOfArrayExceptSelf #PrefixArray #SuffixArray #Arrays #LeetCodeSolutions #Java #JavaProgramming #CodingInterview #InterviewPrep #Algorithms #DataStructures #DSA #SoftwareEngineer #SDE #FAANG #ProblemSolving #Coding #CodeWithVakeel