分类：LeetCode题目解答

力扣(LeetCode)199

题目地址：https://leetcode-cn.com/probl…题目描述：给定一棵二叉树，想象自己站在它的右侧，按照从顶部到底部的顺序，返回从右侧所能看到的节点值。示例: 输入: [1,2,3,nul…

题目地址：https://leetcode-cn.com/probl…题目描述：给定两个字符串 s 和 t，它们只包含小写字母。字符串 t 由字符串 s 随机重排，然后在随机位置添加一个字母。请找出在 t…

Write a SQL query to delete all duplicate email entries in a table named Person, keeping only uniq…

Given a list of airline tickets represented by pairs of departure and arrival airports [from, to],…

Parse XML Tree 现在有一个Tokenizer，返回的Token都是XML标签或者内容，比如(open, html)(inner, hello)(close, html)表示<html>hello…

1. 题目 Given two words (beginWord and endWord), and a dictionary’s word list, find the length of shortest…

Problem Description After enjoying the movie,LeLe went home alone. LeLe decided to build blocks. LeLe has alre…

题目地址：https://leetcode-cn.com/probl…题目描述：给定一个字符串，你的任务是计算这个字符串中有多少个回文子串。具有不同开始位置或结束位置的子串，即使是由相同的字符组成，也会被计…

Given an array of meeting time intervals consisting of start and end times [[s1,e1],[s2,e2],...]&n…

Your task is to design the basic function of Excel and implement the function of sum formula. Specifica…

Implement a magic directory with buildDict, and search methods. For the method buil…

Write an efficient algorithm that searches for a value in an m x n matrix. This matrix has the following prope…