[LeetCode] 48. Rotate Image

Problem : https://leetcode.com/problems/rotate-image/description/

Use common method to rotate matrix in clockwise.

class Solution(object):
    def rotate(self, matrix):
        """
        :type matrix: List[List[int]]
        :rtype: None Do not return anything, modify matrix in-place instead.
        """
        
        # reverse  rows
        left, right = 0, len(matrix)-1
        while left <= right:
            matrix[left], matrix[right] = matrix[right], matrix[left]
            left += 1
            right -= 1
                                                             
        
        # swap the symmetry
        
        for i in range(len(matrix)):
            for j in range(i+1, len(matrix[i])):
                matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]       

Rotate matrix in anticlockwise:

# reverse each row
for i in range(len(maxtrix)):
	reverse(matrix[i])
    
# swap the symmetry
for i in range(len(matrix)):
	for j in range(i+1, len(matrix[i])):
		matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]