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add leetcode problem-cn part6
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<p>给定一个二叉树,找出其最大深度。</p>
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<p>二叉树的深度为根节点到最远叶子节点的最长路径上的节点数。</p>
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<p><strong>说明:</strong> 叶子节点是指没有子节点的节点。</p>
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<p><strong>示例:</strong><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</pre>
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<p>返回它的最大深度 3 。</p>
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