This is the most difficult of all types of iterative tree traversals. You should attempt this problem:Binary Search Tree In-Order Traversal Iterative Solutionbefore this as it is an easier problem. The easiest o
voidpostOrderTraversalIterative(BinaryTree *root){ if(!root)return; stack<BinaryTree*>s; s.push(root); BinaryTree *prev=NULL; while(!s.empty()){ BinaryTree *curr=s.top(); // we are traversing down the tree if(!prev||prev->left==curr||prev->right==curr){ if(curr->left){ s....
Space: O(n). The stack would store all the tree elements in worst case. The set would store all the nodes at the end. 2.2 Iterative solution A better way is based on the fact that post-order traversal is the reverse order of pre-order traversal with visiting the right subtree before ...
In this article, we covered about Binary tree PostOrder traversal and its implementation. 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 pre...
Suppose we have a binary tree. We have to find the post order traversal of this tree using the iterative approach. So if the tree is like − Then the output will be: [9,15,7,10,-10] To solve this, we will follow these steps − if root is null, then return empty array ...
LeetCode 145. Binary Tree Postorder Traversal Given a binary tree, return the postorder traversal of its nodes’ values. Example: Input: [1,null,2,3] 1 2 / 3 Output: [3,2,1] Follow up: Recursive solution is trivial, could you do it iterative......
[LeetCode] Binary Tree Preorder Traversal Given a binary tree, return the preorder traversal of its nodes’ values. For example: Given binary tree {1,#,2,3}, return [3,2,1]. Note: Recursive solution is trivial, could you do it iterativel......
144. Binary Tree Preorder Traversal 题目描述 Given a binary tree, return the preorder traversal of its nodes’ values. 方法思路 Approach1: 递归 recursive Approach2: iteratively...查看原文145. Binary Tree Postorder Traversal 题目描述 Given a binary tree, return the postorder traversal of its ...
145. Binary Tree Postorder Traversal iterative题解 102. Binary Tree Level Order Traversal 题解反过来,可以由中序、前序、后序序列构造二叉树。相关LeetCode题: 889. Construct Binary Tree from Preorder and Postorder Traversal 题解 105. Construct Binary Tree from Preorder and Inorder Traversal 题解 ...
Given binary tree{1,#,2,3}, 1 \ 2 / 3 return[3,2,1]. Note: Recursive solution is trivial, could you do it iteratively? 链接:http://leetcode.com/problems/binary-tree-postorder-traversal/ 题解: 二叉树后序遍历。 刚接触leetcode时也做过这道题,用了很蠢笨的方法。现在学习discuss里大神们...