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leetcode102:二叉树的层序遍历 #47

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@sisterAn

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@sisterAn

给你一个二叉树,请你返回其按 层序遍历 得到的节点值。 (即逐层地,从左到右访问所有节点)。 

示例:
二叉树:[3,9,20,null,null,15,7] ,

    3
   / \
  9  20
    /  \
   15   7

返回其层次遍历结果:

[
  [3],
  [9,20],
  [15,7]
]

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