101.對稱二叉樹

給定一個二叉樹，檢查它是否是鏡像對稱的。 解法1 遞歸 # Definition for a binary tree node. # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution: def isSymmetric(s

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