LeetCode 258 | Add Digits Explained in O(1) 😳 (No Loops!)

🚀 Welcome to my LeetCode Series!

In this video, we solve **LeetCode 258 - Add Digits** step by step.
You’ll learn both the brute force approach and the optimized O(1) trick using the Digital Root concept.

💡 What you’ll learn:

* How to approach the problem from scratch
* Brute force solution with explanation
* O(1) optimized solution (no loops!)
* Digital Root trick (important for interviews)

📌 Problem Example:
38 → 3+8=11 → 1+1=2

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🔥 This series is designed for:

* Coding interview preparation
* DSA beginners
* Anyone who wants to improve problem-solving skills

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💻 Code (C++):

```cpp
int addDigits(int num) {
if (num == 0) return 0;
if (num % 9 == 0) return 9;
return num % 9;
}
```

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📅 New LeetCode videos coming daily!

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Видео LeetCode 258 | Add Digits Explained in O(1) 😳 (No Loops!) канала Jal Patel