Rotate Image
Examples
Example 1:
Input: matrix = [
[1,2],
[3,4]
]
Output: [
[3,1],
[4,2]
]
Example 2:
Input: matrix = [
[1,2,3],
[4,5,6],
[7,8,9]
]
Output: [
[7,4,1],
[8,5,2],
[9,6,3]
]
Math & Geometry
Example 1:
Input: matrix = [
[1,2],
[3,4]
]
Output: [
[3,1],
[4,2]
]
Example 2:
Input: matrix = [
[1,2,3],
[4,5,6],
[7,8,9]
]
Output: [
[7,4,1],
[8,5,2],
[9,6,3]
]
Given a square n x n matrix of integers matrix, rotate it by 90 degrees clockwise.
You must rotate the matrix in-place. Do not allocate another 2D matrix and do the rotation.
n == matrix.length == matrix[i].length1 <= n <= 20-1000 <= matrix[i][j] <= 1000