# 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 flatten(self, root):
"""
:type root: TreeNode
:rtype: void Do not return anything, modify root in-place instead.
"""
if not root:
return root
self.flattenHelper(root)
def flattenHelper(self,root):
if not root.left and not root.right:
return root
left,right=root.left, root.right
end=root
if left:
root.left=None
root.right=left
end=self.flattenHelper(left)
#print end.val
if right:
end.right=right
end=self.flattenHelper(right)
#print end.val
return end
114. Flatten Binary Tree to Linked List
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