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48. Rotate Image

Medium

Description

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, which means you have to modify the input 2D matrix directly. DO NOT allocate another 2D matrix and do the rotation.

Example 1:

Example_1_img

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

Example 2:

Example_2_img

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]]

Constraints:

  • n == matrix.length == matrix[i].length
  • 1 <= n <= 20
  • -1000 <= matrix[i][j] <= 1000

Solutions

Akhil Singh Chauhan Akhil Singh Chauhan
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