# Binary Tree inorder Traversal

Source: Internet
Author: User

https://oj.leetcode.com/problems/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 do it iteratively?

Problem Solving Ideas:

Recursive

`/*** Definition for Binary tree * public class TreeNode {* Int. val; * TreeNode left; * TreeNode right; * TreeNode (int x) {val = x;} }*/ Public classSolution { PublicList<integer>inordertraversal (TreeNode root) {List List=NewArraylist<integer>(); if(Root = =NULL){            returnlist;        } list.addall (Inordertraversal (root.left));        List.add (Root.val);        List.addall (Inordertraversal (root.right)); returnlist; }}`

Non-recursive method

`/*** Definition for Binary tree * public class TreeNode {* Int. val; * TreeNode left; * TreeNode right; * TreeNode (int x) {val = x;} }*/ Public classSolution { PublicList<integer>inordertraversal (TreeNode root) {List<Integer> list =NewArraylist<integer> (); Stack<TreeNode> stack =NewStack<treenode> ();  while(!stack.empty () | | \ root! =NULL){             while(Root! =NULL) {Stack.push (root); Root=Root.left; }            if(!Stack.empty ()) {Root=Stack.pop ();                List.add (Root.val); Root=Root.right; }        }        returnlist; }}`

Binary Tree inorder Traversal

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