Find the Duplicate number | Leetcode | Java | DSA | Problem statement no. 287 | Dry Run

🔥 Find the Duplicate Number | O(n) Time & O(1) Space 🚀

In this video, we solve the famous Find the Duplicate Number problem using the powerful Floyd’s Cycle Detection Algorithm (Tortoise & Hare) — no extra space, super efficient!

💡 What you’ll learn:

Clear understanding of the problem

How to detect duplicate using cycle detection

Step-by-step Dry Run explanation

Time Complexity: O(n) (single traversal)

Space Complexity: O(1) (no extra memory)

Interview-level logic made simple

📌 Example Covered:
nums = [1, 3, 4, 2, 2]
👉 Output: 2

🧠 Logic (Simple Idea):

Treat array like a linked list

Use two pointers: slow & fast

Find meeting point, then detect duplicate

🚀 This is one of the most important problems asked in coding interviews (Google, Amazon, etc.)

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Видео Find the Duplicate number | Leetcode | Java | DSA | Problem statement no. 287 | Dry Run канала CodeWithLogic