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leetcode 538 Convert BST To Greater Tree

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leetcode 538 Convert BST To Greater Tree

解法一

# Definition for a binary tree node.
# class TreeNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None

class Solution(object):
    def __init__(self):
        self.sum = 0
        
    def convertBST(self, root):
        """
        :type root: TreeNode
        :rtype: TreeNode
        """
        if root:
            self.convertBST(root.right)
            root.val += self.sum
            self.sum = root.val
            self.convertBST(root.left)
            
        return root

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