python實現樹的廣度優先搜索BFS

題目描述 從上往下打印出二叉樹的每一個節點，同層節點從左至右打印。node   # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution: # 返回從上到下每一個節點值

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