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33 lines
660 B
HTML
33 lines
660 B
HTML
<p>从上到下按层打印二叉树，同一层的节点按从左到右的顺序打印，每一层打印到一行。</p>
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<p> </p>
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<p>例如:<br>
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给定二叉树: <code>[3,9,20,null,null,15,7]</code>,</p>
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<pre> 3
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/ \
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9 20
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/ \
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15 7
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</pre>
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<p>返回其层次遍历结果：</p>
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<pre>[
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[3],
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[9,20],
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[15,7]
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]
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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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<ol>
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<li><code>节点总数 <= 1000</code></li>
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</ol>
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<p>注意：本题与主站 102 题相同：<a href="https://leetcode-cn.com/problems/binary-tree-level-order-traversal/">https://leetcode-cn.com/problems/binary-tree-level-order-traversal/</a></p>
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