🧠 Contains Duplicate - Leetcode #217 | C++ DSA | Brute to Optimal

🔍 In this video, we solve **Leetcode #217 - Contains Duplicate** using C++ in multiple ways, from **brute force** to the **optimal hashing approach** using `unordered_set`.

📌 This problem teaches you how to:
- Detect duplicates efficiently in an array
- Use C++ sets for faster lookups
- Write clean and optimized code for interview questions

🔹 Problem Type: Arrays / Hashing / Set
🔹 Difficulty: Easy
🔹 Language: C++
🔹 Perfect For: DSA beginners & those revising hashing logic for interviews

✅ Covered in this video:
1️⃣ Brute-force approach (using 2 loops)
2️⃣ Optimized approach using `unordered_set`
3️⃣ Code explanation with dry run
4️⃣ Time & space complexity analysis

🎯 This is part of my C++ DSA Playlist where I break down key Leetcode problems to help you crack coding interviews step-by-step.

🔗 Problem Link: https://leetcode.com/problems/contains-duplicate/

👉 Like, Comment, and Subscribe if this helped! More C++ DSA coming your way.

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#hashing #unorderedset #crackcoding #codinginterview #csstudent #codewithme

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