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<p>在一个 m*n 的二维字符串数组中输出二叉树,并遵守以下规则:</p>
<ol>
<li>行数&nbsp;<code>m</code>&nbsp;应当等于给定二叉树的高度。</li>
<li>列数&nbsp;<code>n</code>&nbsp;应当总是奇数。</li>
<li>根节点的值(以字符串格式给出)应当放在可放置的第一行正中间。根节点所在的行与列会将剩余空间划分为两部分(<strong>左下部分和右下部分</strong>)。你应该将左子树输出在左下部分,右子树输出在右下部分。左下和右下部分应当有相同的大小。即使一个子树为空而另一个非空,你不需要为空的子树输出任何东西,但仍需要为另一个子树留出足够的空间。然而,如果两个子树都为空则不需要为它们留出任何空间。</li>
<li>每个未使用的空间应包含一个空的字符串<code>&quot;&quot;</code></li>
<li>使用相同的规则输出子树。</li>
</ol>
<p><strong>示例 1:</strong></p>
<pre>
<strong>输入:</strong>
1
/
2
<strong>输出:</strong>
[[&quot;&quot;, &quot;1&quot;, &quot;&quot;],
[&quot;2&quot;, &quot;&quot;, &quot;&quot;]]
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong>
1
/ \
2 3
\
4
<strong>输出:</strong>
[[&quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;1&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;],
[&quot;&quot;, &quot;2&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;3&quot;, &quot;&quot;],
[&quot;&quot;, &quot;&quot;, &quot;4&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;]]
</pre>
<p><strong>示例 3:</strong></p>
<pre>
<strong>输入:</strong>
1
/ \
2 5
/
3
/
4
<strong>输出:</strong>
[[&quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;1&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;]
[&quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;2&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;5&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;]
[&quot;&quot;, &quot;3&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;]
[&quot;4&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;, &quot;&quot;]]
</pre>
<p><strong>注意:</strong> 二叉树的高度在范围 [1, 10] 中。</p>