105 lines
2.0 KiB
Java
105 lines
2.0 KiB
Java
//给定一个二叉树的根节点 root ,返回它的 中序 遍历。
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//
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//
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//
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// 示例 1:
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//
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//
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//输入:root = [1,null,2,3]
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//输出:[1,3,2]
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//
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//
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// 示例 2:
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//
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//
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//输入:root = []
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//输出:[]
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//
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//
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// 示例 3:
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//
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//
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//输入:root = [1]
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//输出:[1]
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//
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//
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// 示例 4:
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//
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//
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//输入:root = [1,2]
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//输出:[2,1]
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//
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//
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// 示例 5:
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//
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//
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//输入:root = [1,null,2]
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//输出:[1,2]
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//
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//
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//
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//
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// 提示:
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//
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//
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// 树中节点数目在范围 [0, 100] 内
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// -100 <= Node.val <= 100
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//
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//
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//
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//
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// 进阶: 递归算法很简单,你可以通过迭代算法完成吗?
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// Related Topics 栈 树 哈希表
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// 👍 902 👎 0
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package leetcode.editor.cn;
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import com.code.leet.entiy.TreeNode;
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import java.util.ArrayList;
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import java.util.List;
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//94:二叉树的中序遍历
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public class BinaryTreeInorderTraversal {
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public static void main(String[] args) {
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//测试代码
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Solution solution = new BinaryTreeInorderTraversal().new Solution();
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}
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//力扣代码
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//leetcode submit region begin(Prohibit modification and deletion)
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/**
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* Definition for a binary tree node.
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* public class TreeNode {
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* int val;
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* TreeNode left;
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* TreeNode right;
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* TreeNode() {}
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* TreeNode(int val) { this.val = val; }
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* TreeNode(int val, TreeNode left, TreeNode right) {
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* this.val = val;
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* this.left = left;
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* this.right = right;
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* }
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* }
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*/
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class Solution {
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public List<Integer> inorderTraversal(TreeNode root) {
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List<Integer> list = new ArrayList<>();
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inorder(root, list);
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return list;
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}
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private void inorder(TreeNode root, List<Integer> list) {
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if (root == null) {
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return;
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}
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inorder(root.left, list);
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list.add(root.val);
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inorder(root.right, list);
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}
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}
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//leetcode submit region end(Prohibit modification and deletion)
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} |