题目要求：给定一棵二叉树的根节点 root，返回其节点值的层序遍历结果，即自顶向下、每一层从左到右，最终输出形如 [[3],[9,20],[15,7]] 的二维数组。 Hint 1 树的「层」指距离根节点相等的一组节点；需要设计一种逐层推进、而不是一路向下的算法 Hint 2 使用 BFS ...

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