Rotate Image by 90° In-Place 🔄 | Leetcode 48 | Striver SDE Sheet | Matrix Rotation Made Easy

In this video, we solve Leetcode 48: Rotate Image, a classic matrix problem from the Striver SDE Sheet (Array/Matrix section), commonly asked in top interviews.

📌 Problem Statement:
You are given an n x n 2D matrix representing an image. Rotate the image 90 degrees clockwise, in-place — meaning no extra matrix should be used.

👨‍🏫 What You’ll Learn:

Intuition behind rotating a matrix in-place

Transposing the matrix

Reversing rows (or columns)

Step-by-step dry run and visualization

Why this is optimal (O(1) space, O(n²) time)

🧠 Key Insight:
To rotate 90° clockwise:

Transpose the matrix

Reverse each row

💡 No extra space, clean & efficient!

Видео Rotate Image by 90° In-Place 🔄 | Leetcode 48 | Striver SDE Sheet | Matrix Rotation Made Easy канала Praveen - Codes