LeetCode 917 - Reverse Only Letters Explained in C++ | Two Pointer Approach

In this video, we solve LeetCode Problem 917: Reverse Only Letters using C++. We cover: Two Pointer Technique String Manipulation Handling Special Characters In-Place Reversal Step-by-step Dry Run Optimized O(n) Solution Example Input: s = "a-bC-dEf-ghIj" Output: "j-Ih-gfE-dCba" Because: Only alphabetic characters are reversed. Special characters such as: - ! @ # $ remain in their original positions. Key Idea Use two pointers: One starts from the left One starts from the right If a character is not a letter: Skip it When both pointers point to letters: Swap them Move inward This allows us to reverse only the letters while preserving the position of every non-letter character. Problem LeetCode 917 - Reverse Only Letters Language Used C++ What You'll Learn ✅ Two Pointer Pattern ✅ String Traversal ✅ Character Validation ✅ In-Place Reversal Techniques If you enjoyed the video, make sure to: 👍 Like 💬 Comment 🚀 Subscribe More LeetCode videos coming daily! #leetcode #cpp #dsa #twopointers #strings #programming #codinginterview #leetcode917 #reverseonlyletters #cplusplus #algorithms #interviewprep #stringmanipulation