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...
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,否则就是非法;如果子...
You may serialize the following tree: 1 / \ 2 3 / \ 4 5 as "[1,2,3,null,null,4,5]" Clarification: The above format is the same as how LeetCode serializes a binary tree. You do not necessarily need to follow this format, so please be creative and come up with different approac...
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 between two nodes p and q as the lowest node in T that has both p and q as descendants (where we allow...
Convert Sorted Array to Binary Search Tree Odd even level difference in a binary tree Check if Tree is Isomorphic Expression Tree K distance from root Right View of Binary Tree Diameter of Binary Tree Delete nodes greater than or equal to k in a BST ...
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38voidtopView(Node * root){// Take root position as a base, move left -1, move right +1if(!root)return; vector<int> leftward, rightward; ...
10 phoenix_live_view 6435 972 Elixir 54 Rich, real-time user experiences with server-rendered HTML 2025-04-11T10:16:28Z Go This is top 10, for more click Top 100 Stars in Go RankingProject NameStarsForksLanguageOpen IssuesDescriptionLast Commit 1 awesome-go 141707 12207 Go 5 A curated li...
View Code3、NC45 实现二叉树先序,中序和后序遍历java import java.util.*; /* * public class TreeNode { * int val = 0; * TreeNode left = null; * TreeNode right = null; * } */ public class Solution { /** * * @param root TreeNode类 the root of binary tree * @return int...
0094-Binary-Tree-Inorder-Traversal 0095-Unique-Binary-Search-Trees-II 0096-Unique-Binary-Search-Trees 0098-Validate-Binary-Search-Tree 0099-Recover-Binary-Search-Tree 0100-Same-Tree 0101-Symmetric-Tree 0102-Binary-Tree-Level-Order-Traversal 0104-Maximum-Depth-of-Binary-Tr...
what is the value in the case of HashSet? Well, in the case of HashSet a dummy object is used as a value and key objects are the actual element on Set point of view. Since HashMap doesn't allow duplicate keys it also follows the contract of set data structure to not allow ...