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#!/usr/bin/env python
# -*- coding: utf-8 -*-
class Node:
def __init__(self, val, left=None, right=None):
self.val = val
self.left = left
self.right = right
def sum_tree(node, total=0):
if node is None:
return 0
total = sum_tree(node.left, total) + sum_tree(node.right, total) + node.val
node.val = total - node.val
return total
# Testing
root = Node(1)
root.left = Node(2)
root.right = Node(3)
root.left.left = Node(4)
root.left.right = Node(5)
sum_tree(root)
print(root.val) # Outputs: 14
print(root.left.val) # Outputs: 11
print(root.right.val) # Outputs: 2
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