https://leetcode.com/problems/binary-tree-postorder-traversal/description/ Description Implement an iterative, post-order traversal of a given binary tree, return the list of keys of each node in the tree as it is post-order traversed. Examples 5 / \ 3 8 / \ \ 1 4 11 Post-order trave...
*/classSolution{public List<Integer>preorderTraversal(TreeNode root){List<Integer>result=newLinkedList<>();TreeNode current=root;TreeNode prev=null;while(current!=null){if(current.left==null){result.add(current.val);current=current.right;}else{// has left, then find the rightmost of left su...
Construct Binary Tree from Preorder and Postorder Traversal so we know that the first element of preorder is the root of any tree or subtrees. and the last element of postorder is the root of any tree or subtrees. and the rest of them is the left subtree and right subtree based on c...
leetcode之Construct Binary Tree from Inorder and Postorder Traversal 问题 问题描述: Given inorder and postorder traversal of a tree, construct the binary tree. Note: You may assume that duplicates do not exist in the tree. 啰嗦一句,可能学过数据结构的人看到题目就知道啥意思了,给的问题介绍和...
测试地址: https://leetcode.com/problems/construct-binary-tree-from-inorder-and-postorder-traversal/ """ # Definition for a binary tree node. # class TreeNode(object): # def __init__(self, x): # self.val = x # self.left = None # self.right = None class Solution(object): d...
LeetCode 987. Vertical Order Traversal of a Binary Tree 2019-12-10 07:55 −原题链接在这里:https://leetcode.com/problems/vertical-order-traversal-of-a-binary-tree/ 题目: Given a binary tree, return the vertical order traversal...
145. Binary Tree Postorder Traversal 2019-12-21 10:25 −- 后序遍历二叉树(非递归实现) [题目来源](https://leetcode.com/problems/binary-tree-postorder-traversal/) - C++代码实现 ``` class Solution { public: vector postorderTravers... ...
Given a binary tree, return thepostordertraversal of its nodes' values. For example: Given binary tree{1,#,2,3}, 1 \ 2 / 3 return[3,2,1]. Note: Recursive solution is trivial, could you do it iteratively? 代码: stack 1:
力扣算法题—145BinartTreePostorderTraversal Given a binary tree, return thepostordertraversal of its nodes' values. Example: [1,null,2,3] [3,2,1] Follow up: Recursive solution is trivial, could you do it iteratively? Solution: 使用两个栈,来实现;...
PTA Is Topological Order 2019-11-27 08:51 −Write a program to test if a give sequence Seq is a topological order of a given graph Graph. Format of functions: bool IsTopSeq( LGra... 狂奔的小学生 0 1383 LeetCode 987. Vertical Order Traversal of a Binary Tree ...