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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)

  1. Transpose: Swap matrix[i][j] with matrix[j][i].
  2. 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

Step 1 / 1

Visualization data missing

Initializing...

1x

See the two-step process: Transpose then Reverse.

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