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add leetcode problem-cn part2

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算法题（国内版）/problem (Chinese)/二叉树的右侧视图 [WNC0Lk].html Normal file
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<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>示例 1:</strong></p>
<p><img src="https://assets.leetcode.com/uploads/2021/02/14/tree.jpg" style="width: 270px; " /></p>
<pre>
<strong>输入:</strong>&nbsp;[1,2,3,null,5,null,4]
<strong>输出:</strong>&nbsp;[1,3,4]
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong>&nbsp;[1,null,3]
<strong>输出:</strong>&nbsp;[1,3]
</pre>
<p><strong>示例 3:</strong></p>
<pre>
<strong>输入:</strong>&nbsp;[]
<strong>输出:</strong>&nbsp;[]
</pre>
<p>&nbsp;</p>
<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>
<p>&nbsp;</p>
<p><meta charset="UTF-8" />注意：本题与主站 199&nbsp;题相同：<a href="https://leetcode-cn.com/problems/binary-tree-right-side-view/">https://leetcode-cn.com/problems/binary-tree-right-side-view/</a></p>