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<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2021/02/14/tree.jpg" style="width: 401px; height: 301px;" />
<pre>
<strong>Input:</strong> root = [1,2,3,null,5,null,4]
<strong>Output:</strong> [1,3,4]
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">root = [1,2,3,null,5,null,4]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1,3,4]</span></p>
<p><strong>Explanation:</strong></p>
<p><img alt="" src="https://assets.leetcode.com/uploads/2024/11/24/tmpd5jn43fs-1.png" style="width: 400px; height: 207px;" /></p>
</div>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> root = [1,null,3]
<strong>Output:</strong> [1,3]
</pre>
<div class="example-block">
<p><strong>Input:</strong> <span class="example-io">root = [1,2,3,4,null,null,null,5]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1,3,4,5]</span></p>
<p><strong>Explanation:</strong></p>
<p><img alt="" src="https://assets.leetcode.com/uploads/2024/11/24/tmpkpe40xeh-1.png" style="width: 400px; height: 214px;" /></p>
</div>
<p><strong class="example">Example 3:</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,null,3]</span></p>
<p><strong>Output:</strong> <span class="example-io">[1,3]</span></p>
</div>
<p><strong class="example">Example 4:</strong></p>
<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>&nbsp;</p>
<p><strong>Constraints:</strong></p>