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Leetcode_94_366.java
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37 lines (34 loc) · 835 Bytes
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/*
* @lc app=leetcode.cn id=94 lang=java
*
* [94] 二叉树的中序遍历
*/
// @lc code=start
/**
* Definition for a binary tree node.
* public class TreeNode {
* int val;
* TreeNode left;
* TreeNode right;
* TreeNode(int x) { val = x; }
* }
*/
class Solution {
public List<Integer> inorderTraversal(TreeNode root) {
List<Integer> res = new ArrayList<>();
helper(root, res);
return res;
}
private void helper(TreeNode root, List<Integer> res) {
if (root != null) {
if (root.left != null) {
helper(root.left, res);
}
res.add(root.val);
if (root.right != null) {
helper(root.right, res);
}
}
}
}
// @lc code=end