https://leetcode.cn/problems/number-of-ways-to-reconstruct-a-tree 这道题曾经在周赛难度分top1呆了几年,如今已经不在难度分top5了。破局的关键是父节点的邻居数肯定不少于子节点,而根节点的邻居数一定是n-1。所以应该先找到根节点,然后逐层向下建树,子节点的邻居一定是父节点的子集,否则
https://leetcode.com/problems/validate-stack-sequences/ find out an element in the given sorted row and coloumn matrix. https://leetcode.com/problems/linked-list-cycle/ Top view of a binary Tree psuedo code for Topological sort Again two interviewers started from intro and explain one of yo...
LeetCode Top 100 Liked Questions 236. Lowest Common Ancestor of a Binary Tree (Java版; Medium) 题目描述 Given a binary tree, find the lowest common ancestor (LCA) of two given nodes in the tree. According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined betw...
LeetCode Top 100 Liked Questions 297. Serialize and Deserialize Binary Tree (Java版; Hard) 题目描述 Serialization is the process of converting a data structure or object into a sequence of bits so that it can be stored in a file or memory buffer, or transmitted across a network connection l...
Level order traversal in spiral form Maximum path sum in a binary tree Preorder to Postorder of BST Check Mirror in N-ary Tree Count Number of Nodes in a Complete Binary Tree (Leetcode Problem Solution) Stack Coding Problems Queue Coding Problems ...
10 phoenix_live_view 6493 986 Elixir 44 Rich, real-time user experiences with server-rendered HTML 2025-06-03T16:12:17Z Go This is top 10, for more click Top 100 Stars in Go RankingProject NameStarsForksLanguageOpen IssuesDescriptionLast Commit 1 awesome-go 144813 12336 Go 5 A curated li...
198 Binary Tree Right Side View C++ Python Note Medium 199 Number of Islands C++ Python Note Medium 200 Bitwise AND of Numbers Range C++ Python Note Medium 201 Happy Number C++ Python Note Easy 202 Remove Linked List Elements C++ Python Note Easy 203 Count Primes C++ Python Note Easy...
3. Write a Java program to check if a vowel is present in a string The following example code shows how to use a regular expression to check whether the string contains vowels: publicclassStringContainsVowels{publicstaticvoidmain(String[]args){System.out.println(stringContainsVowels("Hello"));...
leetcode 1008 Construct Binary Search Tree from Preorder Traversal 1.题目描述 2.解题思路 3.Python代码 1.题目描述 返回与给定先序遍历 preorder 相匹配的二叉搜索树(binary search tree)的根结点。 (回想一下,二叉搜索树是二叉树的一种,其每个节点都满足以下规则,对于 node.left 的任...android...
Given a binary tree, find the maximum path sum. For this problem, a path is defined as any sequence of nodes from some starting node to any node in the tree along the parent-child connections. The path does not need to go through the root. ...