In this video, we solve LeetCode Problem 344 – Reverse String using the efficient Two Pointer Technique in C++. This is one of the best beginner-friendly problems to understand pointers, swapping, and in-place array manipulation.
🔍 Problem Statement:
You are given an array of characters. Your task is to reverse the string in-place using O(1) extra memory.
📌 Example:
Input: ["h","e","l","l","o"]
Output: ["o","l","l","e","h"]
💡 Approach Used:
We use two pointers:
One pointer starts from the beginning
Another pointer starts from the end
Swap both characters
Move pointers toward the center
Continue until both pointers meet
⚡ Concepts Covered in This Video:
Two Pointer Technique
String Manipulation
Swapping Elements
In-Place Algorithms
Time & Space Optimization
⏱️ Time Complexity: O(n)
⏱️ Space Complexity: O(1)
💻 This tutorial includes:
✔️ Clean C++ code
✔️ Step-by-step explanation
✔️ Beginner-friendly logic
✔️ Interview preparation concepts
🎯 Perfect for:
DSA beginners
LeetCode practice
Coding interview preparation
Students learning C++
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