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leetcode/problem/rotating-the-box.html

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+<p>You are given an <code>m x n</code> matrix of characters <code>box</code> representing a side-view of a box. Each cell of the box is one of the following:</p>
+
+
+
+<ul>
+
+	<li>A stone <code>&#39;#&#39;</code></li>
+
+	<li>A stationary obstacle <code>&#39;*&#39;</code></li>
+
+	<li>Empty <code>&#39;.&#39;</code></li>
+
+</ul>
+
+
+
+<p>The box is rotated <strong>90 degrees clockwise</strong>, causing some of the stones to fall due to gravity. Each stone falls down until it lands on an obstacle, another stone, or the bottom of the box. Gravity <strong>does not</strong> affect the obstacles&#39; positions, and the inertia from the box&#39;s rotation <strong>does not </strong>affect the stones&#39; horizontal positions.</p>
+
+
+
+<p>It is <strong>guaranteed</strong> that each stone in <code>box</code> rests on an obstacle, another stone, or the bottom of the box.</p>
+
+
+
+<p>Return <em>an </em><code>n x m</code><em> matrix representing the box after the rotation described above</em>.</p>
+
+
+
+<p>&nbsp;</p>
+
+<p><strong>Example 1:</strong></p>
+
+
+
+<p><img alt="" src="https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcodewithstones.png" style="width: 300px; height: 150px;" /></p>
+
+
+
+<pre>
+
+<strong>Input:</strong> box = [[&quot;#&quot;,&quot;.&quot;,&quot;#&quot;]]
+
+<strong>Output:</strong> [[&quot;.&quot;],
+
+&nbsp;        [&quot;#&quot;],
+
+&nbsp;        [&quot;#&quot;]]
+
+</pre>
+
+
+
+<p><strong>Example 2:</strong></p>
+
+
+
+<p><img alt="" src="https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcode2withstones.png" style="width: 375px; height: 195px;" /></p>
+
+
+
+<pre>
+
+<strong>Input:</strong> box = [[&quot;#&quot;,&quot;.&quot;,&quot;*&quot;,&quot;.&quot;],
+