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leetcode104:二叉树的最大深度 #42

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@sisterAn

给定一个二叉树,找出其最大深度。

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。

说明: 叶子节点是指没有子节点的节点。

示例:
给定二叉树 [3,9,20,null,null,15,7]

    3
   / \
  9  20
    /  \
   15   7

返回它的最大深度 3

附赠leetcode地址:leetcode

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