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leetcode-problemset/leetcode-cn/problem (English)/层数最深叶子节点的和(English) [deepest-leaves-sum].html

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Given the <code>root</code> of a binary tree, return <em>the sum of values of its deepest leaves</em>.
<p>&nbsp;</p>
<p><strong class="example">Example 1:</strong></p>
<img alt="" src="https://assets.leetcode.com/uploads/2019/07/31/1483_ex1.png" style="width: 273px; height: 265px;" />
<pre>
<strong>Input:</strong> root = [1,2,3,4,5,null,6,7,null,null,null,null,8]
<strong>Output:</strong> 15
</pre>
<p><strong class="example">Example 2:</strong></p>
<pre>
<strong>Input:</strong> root = [6,7,8,2,7,1,3,9,null,1,4,null,null,null,5]
<strong>Output:</strong> 19
</pre>
<p>&nbsp;</p>
<p><strong>Constraints:</strong></p>
<ul>
<li>The number of nodes in the tree is in the range <code>[1, 10<sup>4</sup>]</code>.</li>
<li><code>1 &lt;= Node.val &lt;= 100</code></li>
</ul>