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7. Binary Tree Inorder Traversal

Binary Tree Inorder Traversal

Given a binary tree, return the inorder traversal of its nodes‘ values.

For example:
Given binary tree {1,#,2,3},

   1         2    /   3

 

return [1,3,2].

Note: Recursive solution is trivial, could you do it iteratively?

 

 

 

# Definition for a binary tree node
# class TreeNode:
# def __init__(self, x):
# self.val = x
# self.left = None
# self.right = None

class Solution:
# @param root, a tree node
# @return a list of integers
  def inorderTraversal(self, root):
    temp = root
    result = []

    stack = []

    if temp is None:
    return result

    stack.insert(0,temp)
    temp = temp.left

    while stack is not None:
      if temp is not None:
        stack.insert(0,temp)
        temp = temp.left
      else:
        temp = stack.pop(0)
        result.append(temp.val)

        temp = temp.right

        if temp is None and not stack:
          break
        else:
          continue

    return result

7. Binary Tree Inorder Traversal