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31 lines
783 B
HTML
31 lines
783 B
HTML
<p>给定一棵二叉树的根节点 <code>root</code> ，请找出该二叉树中每一层的最大值。</p>
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<p> </p>
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<p><strong>示例1：</strong></p>
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<p><img alt="" src="https://assets.leetcode.com/uploads/2020/08/21/largest_e1.jpg" style="height: 172px; width: 300px;" /></p>
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<pre>
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<strong>输入: </strong>root = [1,3,2,5,3,null,9]
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<strong>输出: </strong>[1,3,9]
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</pre>
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<p><strong>示例2：</strong></p>
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<pre>
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<strong>输入: </strong>root = [1,2,3]
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<strong>输出: </strong>[1,3]
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</pre>
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<p> </p>
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<p><strong>提示：</strong></p>
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<ul>
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<li>二叉树的节点个数的范围是 <code>[0,10<sup>4</sup>]</code></li>
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<li><meta charset="UTF-8" /><code>-2<sup>31</sup> <= Node.val <= 2<sup>31</sup> - 1</code></li>
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</ul>
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<p> </p>
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