LeetCode 287 | Find the Duplicate Number

In this problem, we solve LeetCode 287 – Find the Duplicate Number, a popular Array and Linked List Cycle Detection problem that focuses on identifying the repeated number without modifying the array and using only constant extra space. We explore how Floyd’s Cycle Detection Algorithm can be applied to an array by treating values as pointers, leading to an elegant and optimized solution. 💡 In this video: -Understanding the Problem Statement -Brute Force Approach -Sorting-Based Solution -Using HashSet for Duplicate Detection -Why Extra Space is Restricted -Modeling the Array as a Linked List -Introduction to Floyd’s Cycle Detection Algorithm -Detecting the Meeting Point -Finding the Duplicate Number -Step-by-Step Dry Run -Time & Space Complexity Analysis -Java Implementation 🎯 This problem is a classic interview question that demonstrates how cycle detection techniques can be applied beyond linked lists, helping build strong problem-solving intuition for arrays and pointer-based algorithms. 📌 Follow & Connect with Us: 🌐 Website: leetverse.vercel.app 📝 Registration link : https://forms.gle/QkGwatVBXDr6dpxi6 📸 Instagram:   / leetverse   ✨ LeetVerse — Learn, Code, Grow! #LeetCode #DSA #FindTheDuplicateNumber #Arrays #LinkedList #FloydCycleDetection #TwoPointers #Java #CodingInterview #ProblemSolving #LeetVerse #Algorithms