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leetcode-cn/problem (Chinese)/二叉树的后序遍历 [binary-tree-postorder-traversal].html
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<p>&nbsp;</p>
<p><strong>示例 1：</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/08/28/pre1.jpg" style="width: 127px; height: 200px;" />
<pre>
<strong>输入：</strong>root = [1,null,2,3]
<strong>输出：</strong>[3,2,1]
</pre>
<p><strong class="example">示例 1：</strong></p>
<p><strong>示例 2：</strong></p>
<div class="example-block">
<p><span class="example-io"><b>输入：</b>root = [1,null,2,3]</span></p>
<pre>
<strong>输入：</strong>root = []
<strong>输出：</strong>[]
</pre>
<p><span class="example-io"><b>输出：</b>[3,2,1]</span></p>
<p><strong>示例 3：</strong></p>
<p><strong>解释：</strong></p>
<pre>
<strong>输入：</strong>root = [1]
<strong>输出：</strong>[1]
</pre>
<p><img alt="" src="https://assets.leetcode.com/uploads/2024/08/29/screenshot-2024-08-29-202743.png" style="width: 200px; height: 264px;" /></p>
</div>
<p><strong class="example">示例 2：</strong></p>
<div class="example-block">
<p><span class="example-io"><b>输入：</b>root = [1,2,3,4,5,null,8,null,null,6,7,9]</span></p>
<p><span class="example-io"><b>输出：</b>[4,6,7,5,2,9,8,3,1]</span></p>
<p><strong>解释：</strong></p>
<p><img alt="" src="https://assets.leetcode.com/uploads/2024/08/29/tree_2.png" style="width: 350px; height: 286px;" /></p>
</div>
<p><strong class="example">示例 3：</strong></p>
<div class="example-block">
<p><span class="example-io"><b>输入：</b>root = []</span></p>
<p><span class="example-io"><b>输出：</b>[]</span></p>
</div>
<p><strong class="example">示例 4：</strong></p>
<div class="example-block">
<p><span class="example-io"><b>输入：</b>root = [1]</span></p>
<p><span class="example-io"><b>输出：</b>[1]</span></p>
</div>
<p>&nbsp;</p>