> For the complete documentation index, see [llms.txt](https://r24zeng.gitbook.io/leetcode-notebook/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://r24zeng.gitbook.io/leetcode-notebook/zhong-yu-shua-dao-100-dao-le-wo-shi-fen-shui-ling/bu-chong-120-dao/48.-rotate-image.md).

# 48. Rotate Image

\# Medium

{% hint style="info" %}
会就是会，不会就是不会
{% endhint %}

![](https://3288217904-files.gitbook.io/~/files/v0/b/gitbook-legacy-files/o/assets%2F-LxJcc9A1TOyn5a5HJQ4%2F-MHOGKLeA9tSyLaYkDUJ%2F-MHPqF6s42nLVU9Nin8E%2F1600325679265.jpg?alt=media\&token=7140c104-5b31-4251-8742-87dc0a5aaff2)

```python
class Solution:
    def rotate(self, matrix: List[List[int]]) -> None:
        """
        Do not return anything, modify matrix in-place instead.
        """
        n = len(matrix)
        # 对角线交换
        for i in range(n):
            for j in range(i+1, n):
                matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]

        # 左右互换
        for i in range(n):
            for j in range(n//2):
                matrix[i][n-j-1], matrix[i][j] = matrix[i][j], matrix[i][n-j-1]
```