leetcode-problemset/leetcode-cn/problem (Chinese)/二叉树的右视图 [binary-tree-right-side-view].html

<p>给定一个二叉树的 <strong>根节点</strong> <code>root</code>，想象自己站在它的右侧，按照从顶部到底部的顺序，返回从右侧所能看到的节点值。</p>

<p>&nbsp;</p>

<p><strong class="example">示例 1：</strong></p>

<div class="example-block">
<p><span class="example-io"><b>输入：</b>root = [1,2,3,null,5,null,4]</span></p>

<p><strong>输出：</strong><span class="example-io">[1,3,4]</span></p>

<p><strong>解释：</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">示例 2：</strong></p>

<div class="example-block">
<p><span class="example-io"><b>输入：</b>root = [1,2,3,4,null,null,null,5]</span></p>

<p><span class="example-io"><b>输出：</b>[1,3,4,5]</span></p>

<p><strong>解释：</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">示例 3：</strong></p>

<div class="example-block">
<p><strong>输入：</strong><span class="example-io">root = [1,null,3]</span></p>

<p><strong>输出：</strong><span class="example-io">[1,3]</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 = []</span></p>

<p><strong>输出：</strong><span class="example-io">[]</span></p>

<p>&nbsp;</p>
</div>

<p><strong>提示:</strong></p>

<ul>
	<li>二叉树的节点个数的范围是 <code>[0,100]</code></li>
	<li><meta charset="UTF-8" /><code>-100&nbsp;&lt;= Node.val &lt;= 100</code>&nbsp;</li>
</ul>