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# [429] N 叉树的层序遍历
# 给定一个 N 叉树,返回其节点值的层序遍历。(即从左到右,逐层遍历)。 # 树的序列化输入是用层序遍历,每组子节点都由 null 值分隔(参见示例)。 # 把当前层的结点放到curLevel里面。
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