Rotate Image

Medium

Given an n x n matrix, rotate it 90 degrees clockwise. LeetCode mutates in place and returns void; here return the rotated matrix.

Example 1

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

Example 2

Input:  grid = [[1,2],[3,4]]
Output: [[3,1],[4,2]]

Constraints

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