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 --- 🔥 This series is designed for: * Coding interview preparation * DSA beginners * Anyone who wants to improve problem-solving skills --- 💻 Code (C++): ```cpp int addDigits(int num) { if (num == 0) return 0; if (num % 9 == 0) return 9; return num % 9; } ``` --- 👍 If you found this helpful: Like ❤️ Subscribe 🔔 Comment your doubts 👇 --- 📅 New LeetCode videos coming daily! #LeetCode #DSA #CodingInterview #Programming #CPlusPlus #ProblemSolving #Tech #LearnToCode