# class TreeNode:
# def __init__(self, x):
# self.val = x
# self.left = None
# self.right = None
#
# 代码中的类名、方法名、参数名已经指定,请勿修改,直接返回方法规定的值即可
#
#
# @param root TreeNode类
# @return int整型
#
class Solution:
def maxP(self,root,cmax):
if root==None:
return 0,cmax
c1,cmax=self.maxP(root.left, cmax) #child left
c2,cmax=self.maxP(root.right, cmax) #child right
cmax=max(c1+root.val,c2+root.val,c1+c2+root.val,root.val,cmax)
# print(c1+root.val,c2+root.val,c1+c2+root.val,cmax)
return max(c1+root.val,c2+root.val,root.val),cmax
def maxPathSum(self , root: TreeNode) -> int:
# write code here
c,m=self.maxP(root,-10000)
return m