Find Duplicates in Array with O(1) Extra Space | GFG POTD | Best Approach | C++ Explained
🔥 In this video, we solve the popular problem Find Duplicates in an Array — but with an important twist:
✨ Only O(1) extra space allowed!
We use a smart in-place approach to identify duplicates efficiently.
💡 What you'll learn:
✔️ Simple explanation of the logic
✔️ Why extra arrays or maps are not allowed
✔️ Efficient in-place marking method
✔️ Full C++ solution + walkthrough
✔️ Time & Space Complexity:
👉 O(n) Time
👉 O(1) Space
Great problem to sharpen in-place array manipulation skills for interview prep.
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