题解 | #二叉树的中序遍历#
二叉树的中序遍历
https://www.nowcoder.com/practice/0bf071c135e64ee2a027783b80bf781d
import java.util.*;
/*
* public class TreeNode {
* int val = 0;
* TreeNode left = null;
* TreeNode right = null;
* public TreeNode(int val) {
* this.val = val;
* }
* }
*/
public class Solution {
/**
* 代码中的类名、方法名、参数名已经指定，请勿修改，直接返回方法规定的值即可
*
*
* @param root TreeNode类
* @return int整型一维数组
*/
public int[] inorderTraversal(TreeNode root) {
// write code here
List<Integer> list = new ArrayList<Integer>();
inorder(root, list);
int[] inorder = new int[list.size()];
for (int i = 0; i < inorder.length; i++) {
inorder[i] = list.get(i);
}
return inorder;
}
public void inorder(TreeNode root, List<Integer> list) {
if (root == null) {
return;
}
inorder(root.left, list);
list.add(root.val);
inorder(root.right, list);
}
}