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 :
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]
]
方案:
首先转置,然后每行的数字翻转:
1 2 3 1 4 7 7 4 1
4 5 6 --> 2 5 8 --> 8 5 2
7 8 9 3 6 9 9 6 3
leetcode 48. Rotate Image
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转载自blog.csdn.net/acttell/article/details/80892512
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