What is the Rotate Image pattern?

The Rotate Image is a common coding interview pattern in Matrices problems. It provides a structured approach to solving related algorithm challenges efficiently.

When should I use Rotate Image?

Use the Rotate Image pattern when you encounter problems matching its characteristics. Check the "When to Use" and "Clues" sections in the lesson for specific indicators.

Is Rotate Image asked in FAANG interviews?

Yes, Rotate Image is an essential pattern commonly tested in FAANG and top tech company technical interviews.

Matrices

Medium

Rotate Image

Rotate the matrix by 90 degrees clockwise in-place.

10 min read

Solve on LeetCode

Problem Understanding

You are given an n x n 2D matrix representing an image, rotate the image by 90 degrees (clockwise). You have to rotate the image in-place.

Strategy (Transpose + Reflect)

Transpose: Swap matrix[i][j] with matrix[j][i].
Reflect: Reverse each row.

Step 1: Transpose converts rows to columns.
Step 2: Reversing rows fixes the left-right order for 90 deg rotation.

Interactive Visualization

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