这是悦乐书的第279次更新，第295篇原创 01 看题和准备 今天介绍的是LeetCode算法题中Easy级别的第147题（顺位题号是645）。集合S最初包含从1到n的数字。 但不幸的是，由于数据错误，集合中的一个数字被…
分类：LeetCode
[LeetCode] Delete Duplicate Emails 删除重复邮箱
Write a SQL query to delete all duplicate email entries in a table named Person, keeping only uniq…
[LeetCode] Reconstruct Itinerary 重建行程单
Given a list of airline tickets represented by pairs of departure and arrival airports [from, to],…
[Algo] Parse XML Tree 解析XML文件
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…
【leetcode】127. Word Ladder 等长字符串集合的A到B的转移最短长度
1. 题目 Given two words (beginWord and endWord), and a dictionary’s word list, find the length of shortest…
LeetCode | Jump Game（跳远游戏）
Given an array of non-negative integers, you are initially positioned at the first index of the array. Each el…
LeetCode 141. Linked List Cycle
Given a linked list, determine if it has a cycle in it. Follow up:Can you solve it without using extra space? …
［LeetCode］Degree of an Array 数组的度
链接：https://leetcode.com/problems/degree-of-an-array/description/ 难度：Easy 题目：697. Degree of an Array Given a no…
HDU—— 5159 Building Blocks
Problem Description After enjoying the movie,LeLe went home alone. LeLe decided to build blocks. LeLe has alre…
力扣(LeetCode)647
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…
LeetCode | Surrounded Regions（包围的区域）
Given a 2D board containing 'X' and 'O', capture all regions surrounded by 'X'. A region i…
[LeetCode][Python]434. Number of Segments in a String
Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space …
