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修改说明
在循环 while queue: 内遍历二叉树时,for i in range(len(queue)) 用于确保循环内的操作局限于某一层。但在本题中,仅需对每个节点的两个子节点进行翻转,不需要这个冗余的循环。因此,直接删除该循环。删除后,代码仍然能够正确运行并通过提交。