Given a square integer matrix of size n x n, rotate the matrix 90 degrees clockwise in-place. Modify the input matrix directly without allocating a new matrix. Return the modified matrix.
Example 1
Input: [[10,20],[30,40]]
Output: [[30,10],[40,20]]
Explanation: After rotating 90 degrees clockwise, the first column becomes the first row.
Example 2
Input: [[1,2,3],[4,5,6],[7,8,9]]
Output: [[7,4,1],[8,5,2],[9,6,3]]
Explanation: Each layer is rotated in-place.
Constraints
Case 1
Input: [[2,4],[6,8]]
Expected: [[6,2],[8,4]]
Case 2
Input: [[11,12,13],[14,15,16],[17,18,19]]
Expected: [[17,14,11],[18,15,12],[19,16,13]]
Case 3
Input: [[5]]
Expected: [[5]]
Case 4
Input: [[0,1,2],[3,4,5],[6,7,8]]
Expected: [[6,3,0],[7,4,1],[8,5,2]]