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
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...
LeetCode Top 100 Liked Questions 543. Diameter of Binary Tree (Java版; Easy) 题目描述 Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or...
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...
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 Linked list Coding Problems ...
7 LeetCodeAnimation 75949 13990 Java 19 Demonstrate all the questions on LeetCode in the form of animation.(用动画的形式呈现解LeetCode题目的思路) 2023-08-14T12:14:01Z 8 elasticsearch 72854 25238 Java 4170 Free and Open Source, Distributed, RESTful Search Engine 2025-06-04T01:33:39Z 9 int...
LeetCode solutions in C++ 11 and Python3. NO.TitleSolutionNoteDifficultyTag 0 Two Sum C++ Python Note Easy Mapping 1 Add Two Numbers C++ Python Note Medium LinkedList 2 Longest Substring Without Repeating Characters C++ Python Note Medium Mapping 3 Median of Two Sorted Arrays C++ Python Note Har...
* TreeNode *right; * TreeNode(int x) : val(x), left(NULL), right(NULL) {} * };*/classSolution {public:intmaxPathSum(TreeNode*root) { rec(root);returnmax; }intrec(TreeNode *root) {if(root ==NULL)return0;intl = rec(root->left);intr = rec(root->right);if(root->val>max...
View Code3、NC45 实现二叉树先序,中序和后序遍历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整型二维...
This course will teach 15 essential coding patterns like sliding window, merge interval, two pointers, etc which can be used to solved 100+ Leetcode problems and help you in real coding interviews. 9) Write a Java program to check if a number is Prime or not? (solution) A number is ...