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Description
tab: English
<p>You are given an <code>n x n</code> 2D <code>matrix</code> representing an image, rotate the image by <strong>90</strong> degrees (clockwise).</p>
<p>You have to rotate the image <a href="https://en.wikipedia.org/wiki/In-place_algorithm" target="_blank"><strong>in-place</strong></a>, which means you have to modify the input 2D matrix directly. <strong>DO NOT</strong> allocate another 2D matrix and do the rotation.</p>
<p> </p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/08/28/mat1.jpg" style="width: 500px; height: 188px;" />
<pre>
<strong>Input:</strong> matrix = [[1,2,3],[4,5,6],[7,8,9]]
<strong>Output:</strong> [[7,4,1],[8,5,2],[9,6,3]]
</pre>
<p><strong class="example">Example 2:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/08/28/mat2.jpg" style="width: 500px; height: 201px;" />
<pre>
<strong>Input:</strong> matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]]
<strong>Output:</strong> [[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]
</pre>
<p> </p>
<p><strong>Constraints:</strong></p>
<ul>
<li><code>n == matrix.length == matrix[i].length</code></li>
<li><code>1 <= n <= 20</code></li>
<li><code>-1000 <= matrix[i][j] <= 1000</code></li>
</ul>
---
[submissions](https://leetcode.com/problems/rotate-image/submissions/) | [solutions](https://leetcode.com/problems/rotate-image/solutions/)
tab: 中文
<p>给定一个 <em>n </em>× <em>n</em> 的二维矩阵 <code>matrix</code> 表示一个图像。请你将图像顺时针旋转 90 度。</p>
<p>你必须在<strong><a href="https://baike.baidu.com/item/%E5%8E%9F%E5%9C%B0%E7%AE%97%E6%B3%95" target="_blank"> 原地</a></strong> 旋转图像，这意味着你需要直接修改输入的二维矩阵。<strong>请不要 </strong>使用另一个矩阵来旋转图像。</p>
<p> </p>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/08/28/mat1.jpg" style="height: 188px; width: 500px;" />
<pre>
<strong>输入：</strong>matrix = [[1,2,3],[4,5,6],[7,8,9]]
<strong>输出：</strong>[[7,4,1],[8,5,2],[9,6,3]]
</pre>
<p><strong>示例 2：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/08/28/mat2.jpg" style="height: 201px; width: 500px;" />
<pre>
<strong>输入：</strong>matrix = [[5,1,9,11],[2,4,8,10],[13,3,6,7],[15,14,12,16]]
<strong>输出：</strong>[[15,13,2,5],[14,3,4,1],[12,6,8,9],[16,7,10,11]]
</pre>
<p> </p>
<p><strong>提示：</strong></p>
<ul>
<li><code>n == matrix.length == matrix[i].length</code></li>
<li><code>1 <= n <= 20</code></li>
<li><code>-1000 <= matrix[i][j] <= 1000</code></li>
</ul>
<p> </p>
---
[提交记录](https://leetcode.cn/problems/rotate-image/submissions/) | [题解](https://leetcode.cn/problems/rotate-image/solution/)
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