#!/usr/bin/env python
# -- coding: utf-8 --#
# @Time : 2020/4/22 9:16 
# @Author : Aries 
# @Site :  
# @File : tree_node.py 
# @Software: PyCharm

class TreeNode:
    def __init__(self, x):
        self.val = x
        self.left = None
        self.right = None