new_contents: """Leetcode 48. Rotate Image
  Medium
  
  URL: https://leetcode.com/problems/rotate-image/
  
  You are given an n x n 2D matrix representing an image.
  
  Rotate the image by 90 degrees (clockwise).
  
  Note:
  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:
  Given input matrix = 
  [
    [1,2,3],
    [4,5,6],
    [7,8,9]
  ],
  rotate the input matrix in-place such that it becomes:
  [
    [7,4,1],
    [8,5,2],
    [9,6,3]
  ]
  
  Example 2:
  Given input matrix =
  [
    [ 5, 1, 9,11],
    [ 2, 4, 8,10],
    [13, 3, 6, 7],
    [15,14,12,16]
  ], 
  rotate the input matrix in-place such that it becomes:
  [
    [15,13, 2, 5],
    [14, 3, 4, 1],
    [12, 6, 8, 9],
    [16, 7,10,11]
  ]
  """
  
  
  class Solution(object):
      def rotate(self, matrix):
          """
          :type matrix: List[List[int]]
          :rtype: None Do not return anything, modify matrix in-place instead.
          """
          pass
  
  
  def main():
      pass
  
  
  if __name__ == '__main__':
      main()
  
subject: Add lc0048_rotate_image.py