48. Rotate Image
Difficulty: Medium
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:
Input: matrix = [[1,2,3],[4,5,6],[7,8,9]] Output: [[7,4,1],[8,5,2],[9,6,3]]
Example 2:
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]]
Python Solution:
class Solution(object):
def rotate(self, matrix):
for i in range(len(matrix)):
for j in range(i,len(matrix)):
matrix[i][j],matrix[j][i]=matrix[j][i],matrix[i][j]
for i in range(len(matrix)):
matrix[i]=matrix[i][::-1]
return matrix
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