importjava.util.Arrays;importjava.util.Stack;importjava.util.TreeMap;/** * * Source : 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}, ...
Morris Traversal方法遍历二叉树(非递归,不用栈,O(1)空间) /** * Definition for a binary tree node. * public class TreeNode { * int val; * TreeNode left; * TreeNode right; * TreeNode(int x) { val = x; } * } */ import java.util.List; import java.util.ArrayList; import java.u...
2.2 last.right 不为 null,说明之前已经访问过,第二次来到这里,表明当前子树遍历完成,保存 cur 的值,更新 cur = cur.right public List<Integer> inorderTraversal3(TreeNode root) { List<Integer> ans = new ArrayList<>(); TreeNode cur = root; while (cur != null) { //情况 1 if (cur.left ...
The easiest way to implement theinOrdertraversal algorithm in Java or any programming language is by using recursion. Since the binary tree is a recursive data structure, recursion is the natural choice for solving a tree-based problem. TheinOrder()method in theBinaryTreeclass implements the logi...
preorder: root-left-right inorder: left-root-right postorder: left-right-root order指的是root的位置。 recursive算法比较简单,iterative算法比较难想,可是leetcode原题都说了: recursive method is trivial, could you do iteration? 144.Binary Tree Preorder Traversal ...
Leetcode 94: Binary Tree Inorder Traversal-中序遍历 自动驾驶搬砖师 一步一个台阶,一天一个脚印 一、题目描述 给定一个二叉树,返回它的中序遍历。 二、解题思路 2.1 递归法 时间复杂度 O(n) 空间复杂度 O(n) 2.2 迭代法 时间复杂度 O(n) 空间复杂度 O(n)(...
TreeNode tempNode=queue.poll(); System.out.printf("%d ",tempNode.data); if(tempNode.left!=null) queue.add(tempNode.left); if(tempNode.right!=null) queue.add(tempNode.right); } } 4. Complete Java Program Lets say our binary tree is : So Level Order traversal will work as below:...
We have done traversal using two approaches: Iterative and Recursive. We also discussed about time and space complexity for the PostOrder traversal. Java Binary tree tutorial Binary tree in java Binary tree preorder traversal Binary tree postorder traversal Binary tree inorder traversal Binary tree ...
7 * TreeNode(int x) : val(x), left(NULL), right(NULL) {} 8 * }; 9 */ 10 class Solution { 11 public: 12 vector<int> inorderTraversal(TreeNode *root) { 13 vector<int> res; 14 if(root==NULL) return res; 15 stack<TreeNode*> s; ...
Given preorder and inorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. For example, given preorder = [3,9,20,15,7] inorder = [9,3,15,20,7] 1. 2. Return the following binary tree: ...