之前一位大佬的颜色标记法,个人感觉理解起来比较轻松 # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # self.right = None # # # @param root TreeNode类 the root of binary tree # @return int整型二维数组 # class Solution: def threeOrders(self , root ): # write code h...