#+ANKI_DECK: study_deck_02
* TODO 0048. Rotate Image :medium:
:PROPERTIES:
:NEETCODE: [[file:../../roadmap.org::*0048. Rotate Image][0048. Rotate Image]]
:END:

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:*


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


*Example 2:*


#+begin_src
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]]
#+end_src


*Constraints:*

 - ~n == matrix.length == matrix[i].length~

 - ~1 <= n <= 20~

 - ~-1000 <= matrix[i][j] <= 1000~

** TODO Approach
Write your approach here.

** TODO Python
#+begin_src python :lc-problem 48 :lc-lang python3
class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
#+end_src

** TODO C++
#+begin_src cpp :lc-problem 48
class Solution {
public:
    void rotate(vector<vector<int>>& matrix) {
        
    }
};
#+end_src