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leetcode/problem/cyclically-rotating-a-grid.html

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+<p>You are given an <code>m x n</code> integer matrix <code>grid</code>​​​, where <code>m</code> and <code>n</code> are both <strong>even</strong> integers, and an integer <code>k</code>.</p>
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+
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+<p>The matrix is composed of several layers, which is shown in the below image, where each color is its own layer:</p>
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+
+
+<p><img alt="" src="https://assets.leetcode.com/uploads/2021/06/10/ringofgrid.png" style="width: 231px; height: 258px;" /></p>
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+
+
+<p>A cyclic rotation of the matrix is done by cyclically rotating <strong>each layer</strong> in the matrix. To cyclically rotate a layer once, each element in the layer will take the place of the adjacent element in the <strong>counter-clockwise</strong> direction. An example rotation is shown below:</p>
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+<img alt="" src="https://assets.leetcode.com/uploads/2021/06/22/explanation_grid.jpg" style="width: 500px; height: 268px;" />
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+<p>Return <em>the matrix after applying </em><code>k</code> <em>cyclic rotations to it</em>.</p>
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+
+
+<p>&nbsp;</p>
+
+<p><strong>Example 1:</strong></p>
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+<img alt="" src="https://assets.leetcode.com/uploads/2021/06/19/rod2.png" style="width: 421px; height: 191px;" />
+
+<pre>
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+<strong>Input:</strong> grid = [[40,10],[30,20]], k = 1
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+<strong>Output:</strong> [[10,20],[40,30]]
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+<strong>Explanation:</strong> The figures above represent the grid at every state.
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+</pre>
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+
+
+<p><strong>Example 2:</strong></p>