Leetcode——437. 路徑總和 III

思路：遞歸寫法，用一個數組（python用鏈表）存儲以前節點的值，而後對每一個節點進行向前回溯。 pythonnode # Definition for a binary tree node. # class TreeNode: # def __init__(self, x): # self.val = x # self.left = None # self.right = None class

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