Letter Combination of a Phone Number | BEST Approach | Backtracking | C++ | LeetCode

🔥 Letter Combinations of a Phone Number — Full Explanation + Optimal Solution in C++ In today’s video, we break down the classic LeetCode/DSA problem: Letter Combinations of a Phone Number, using a clean and intuitive approach with Backtracking. This problem is very commonly asked in top tech interviews and is perfect for improving recursion and combinatorics understanding. 💡 What you'll learn in this video: ✔️ Problem understanding in simple words ✔️ Visual explanation of how combinations are generated ✔️ Code walkthrough + dry run ✔️ Time and space complexity analysis: 👉 Time Complexity: O(4^n) [as each digit can map up to 4 letters and there are n digits] 👉 Space Complexity: O(n) [recursion stack depth] Whether you're practicing for interviews, improving DSA, or solving LeetCode challenges — this video is for you! 📌 Don’t forget: 👍 Like the video 🔔 Subscribe for daily DSA problem solutions 💬 Comment your doubts — we respond to all! #DSA #Coding #Backtracking #LeetCode #LetterCombinations #PhoneNumber #CodingInterview #DSAPractice #CompetitiveProgramming #Recursion #CPlusPlus #LeetCodeSolution #DailyCoding

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