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Binary Tree Inorder Traversal.java
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Binary Tree Inorder Traversal.java
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/*
Given a binary tree, return the inorder traversal of its nodes' values.
Link: https://leetcode.com/problems/binary-tree-inorder-traversal/
Example: For example:
Given binary tree {1,#,2,3},
1
\
2
/
3
return [1,3,2].
Solution: None
Source: None
*/
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
public class Solution {
public List<Integer> inorderTraversal(TreeNode root) {
List<Integer> result = new ArrayList<Integer>();
if (root == null) {
return result;
}
Stack<TreeNode> parentStack = new Stack<TreeNode>();
// parentStack.push(root);
while (! parentStack.empty() || root != null) {
if (root != null) {
parentStack.push(root);
root = root.left;
} else {
root = parentStack.pop();
result.add(root.val);
root = root.right;
}
}
return result;
}
}