Binary Tree Inorder Traversal


题目描述：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?

解题思路：左根右，中序遍历二叉树。

Java代码实现：

/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Solution {
List<Integer> list=new ArrayList<Integer>();
public List<Integer> inorderTraversal(TreeNode root) {
if(root==null) return list;
inorderTraversal(root.left);
list.add(root.val);
inorderTraversal(root.right);
return list;
}
}原题题目：https://leetcode.com/problems/binary-tree-inorder-traversal/