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Matrix State

1

2

3

4

5

6

7

8

9

Process Step

Initialize left and right pointers to define outer boundary layer.

Variables

l0

r2

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Example 1:

Input: matrix = [[1,2,3],[4,5,6],[7,8,9]]

Output: [[7,4,1],[8,5,2],[9,6,3]]

Explanation: The matrix is rotated 90 degrees clockwise. 1 becomes 7, 2 becomes 4 and so on.

Example 2:

Input: matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]]

Output: [[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]

Explanation: The 4x4 matrix is rotated 90 degrees clockwise.

Example 3:

Input: matrix = [[1]]

Output: [[1]]

Explanation: A 1x1 matrix remains unchanged after rotation.

Example 4:

Input: matrix = [[1,2],[3,4]]

Output: [[3,1],[4,2]]

Explanation: The 2x2 matrix is rotated 90 degrees clockwise.

Example 5:

Input: matrix = [[1, 2, 3, 4, 5], [6, 7, 8, 9, 10], [11, 12, 13, 14, 15], [16, 17, 18, 19, 20], [21, 22, 23, 24, 25]]

Output: [[21, 16, 11, 6, 1], [22, 17, 12, 7, 2], [23, 18, 13, 8, 3], [24, 19, 14, 9, 4], [25, 20, 15, 10, 5]]

Explanation: A 5x5 matrix rotated clockwise.

Constraints:

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Time Complexity

O(n²)

Space Complexity

O(1)

112. Rotate Image

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Example 4:

Example 5:

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112. Rotate Image

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Matrix State

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Example 2:

Example 3:

Example 4:

Example 5:

Constraints:

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Matrix State

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