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64 lines
2.3 KiB
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64 lines
2.3 KiB
HTML
<p>给你一个 <code>m x n</code> 的字符矩阵 <code>box</code> ，它表示一个箱子的侧视图。箱子的每一个格子可能为：</p>
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<ul>
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<li><code>'#'</code> 表示石头</li>
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<li><code>'*'</code> 表示固定的障碍物</li>
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<li><code>'.'</code> 表示空位置</li>
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</ul>
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<p>这个箱子被 <strong>顺时针旋转 90 度</strong> ，由于重力原因，部分石头的位置会发生改变。每个石头会垂直掉落，直到它遇到障碍物，另一个石头或者箱子的底部。重力 <strong>不会</strong> 影响障碍物的位置，同时箱子旋转不会产生<strong>惯性</strong> ，也就是说石头的水平位置不会发生改变。</p>
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<p>题目保证初始时 <code>box</code> 中的石头要么在一个障碍物上，要么在另一个石头上，要么在箱子的底部。</p>
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<p>请你返回一个<em> </em><code>n x m</code>的矩阵，表示按照上述旋转后，箱子内的结果。</p>
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<p> </p>
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<p><strong>示例 1：</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcodewithstones.png" style="width: 300px; height: 150px;"></p>
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<pre><b>输入：</b>box = [["#",".","#"]]
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<b>输出：</b>[["."],
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["#"],
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["#"]]
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</pre>
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<p><strong>示例 2：</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcode2withstones.png" style="width: 375px; height: 195px;"></p>
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<pre><b>输入：</b>box = [["#",".","*","."],
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["#","#","*","."]]
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<b>输出：</b>[["#","."],
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["#","#"],
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["*","*"],
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[".","."]]
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</pre>
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<p><strong>示例 3：</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2021/04/08/rotatingtheboxleetcode3withstone.png" style="width: 400px; height: 218px;"></p>
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<pre><b>输入：</b>box = [["#","#","*",".","*","."],
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["#","#","#","*",".","."],
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["#","#","#",".","#","."]]
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<b>输出：</b>[[".","#","#"],
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[".","#","#"],
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["#","#","*"],
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["#","*","."],
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["#",".","*"],
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["#",".","."]]
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li><code>m == box.length</code></li>
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<li><code>n == box[i].length</code></li>
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<li><code>1 <= m, n <= 500</code></li>
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<li><code>box[i][j]</code> 只可能是 <code>'#'</code> ，<code>'*'</code> 或者 <code>'.'</code> 。</li>
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</ul>
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