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leetcode-cn/problem (English)/二叉树的前序遍历(English) [binary-tree-preorder-traversal].html
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<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2020/09/15/inorder_1.jpg" style="width: 125px; height: 200px;" />
<pre>
<strong>Input:</strong> root = [1,null,2,3]
<strong>Output:</strong> [1,2,3]
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">root = [1,null,2,3]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1,2,3]</span></p>
<p><strong>Explanation:</strong></p>
<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">Example 2:</strong></p>
<pre>
<strong>Input:</strong> root = []
<strong>Output:</strong> []
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">root = [1,2,3,4,5,null,8,null,null,6,7,9]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1,2,4,5,6,7,3,8,9]</span></p>
<p><strong>Explanation:</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">Example 3:</strong></p>
<pre>
<strong>Input:</strong> root = [1]
<strong>Output:</strong> [1]
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">root = []</span></p>
<p><strong>Output:</strong> <span class="example-io">[]</span></p>
</div>
<p><strong class="example">Example 4:</strong></p>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">root = [1]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1]</span></p>
</div>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>