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add leetcode problem-cn part6

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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> </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> [1,2,3,null,5,null,4]
<strong>输出:</strong> [1,3,4]
</pre>
<p><strong>示例 2:</strong></p>
<pre>
<strong>输入:</strong> [1,null,3]
<strong>输出:</strong> [1,3]
</pre>
<p><strong>示例 3:</strong></p>
<pre>
<strong>输入:</strong> []
<strong>输出:</strong> []
</pre>
<p> </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 <= Node.val <= 100</code> </li>
</ul>