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leetcode 606 Construct String From Binary Tree

文档信息

leetcode 606 Construct String From Binary 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 tree2str(self, t):
        """
        :type t: TreeNode
        :rtype: str
        """
        ans = ''
        if t:
            ans += str(t.val)
            if t.left != None:
                ans += '('+self.tree2str(t.left)+')'
            elif t.left == None and t.right != None:
                ans += '()'
            if t.right != None:
                ans += '('+self.tree2str(t.right)+')'
        return ans

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