题目描述 Most of you have played card games (and if you haven’t, why not???) in which the deck of cards is randomized by shuffling it one or more times.A perfect shuffle is a type of shuffle where the initial deck is divided exactly in half, and the two hal…

[原创]互联网项目中mysql应该选什么事务隔离级别 Mysql为什么不和Oracle一样使用RC,而用RR 使用RC的原因 这个是有历史原因的,当然要从我们的主从复制开始讲起了!主从复制,是基于什么复制的?是基于binlog复制的!这里不想去搬binlog的概念了,就简单理解为binlog是一个记录数据库更改的文件吧- binlog有几种格式?OK,三种,分别是 statement:记录的是修改SQL语句row:记录的是每行实际数据的变更mixed:statement和row模式的混合 那My…

题目描述 Jack and Jill developed a special encryption method, so they can enjoy conversations without worrrying about eavesdroppers. Here is how: let L be the length of the original message, and M be the smallest square number greater than or equal to L.…

本文为mariadb官方手册:How to Quickly Insert Data Into MariaDB的译文. 原文:https://mariadb.com/kb/en/how-to-quickly-insert-data-into-mariadb/ 我提交到MariaDB官方手册的译文:https://mariadb.com/kb/zh-cn/how-to-quickly-insert-data-into-mariadb/…

GIT将已提交到本地的文件上传至远程仓库: 1.  右击项目——Team——Push to Upstream,即可将已保存在本地的文件上传推至GIT远程仓库.…

abstract: V const & a 加速 F. Mirror 题意 链接 问题: 有n个人在y=0的平面上(及xoz平面).z=0平面上有一面镜子(边平行于坐标轴).z=a平面上有q个点(保证a大于所有人的z坐标). 所有人面朝镜子,且在镜子和q个点之间(即每个人的z坐标保证0<z<a). 问对于某个点,让所有人能够通过镜子看到那个点的镜子的最小面积. 题解 三维几何+镜像+凸包 首先考虑镜面,我们可以通过(初中科学的)镜面反射原理,关于z=0做出z=a的对称平面z=-a.问题…

Problem F Time Limit : 3000/1000ms (Java/Other)   Memory Limit : 32768/32768K (Java/Other) Total Submission(s) : 54   Accepted Submission(s) : 6 Font: Times New Roman | Verdana | Georgia Font Size: ← → Problem Description 在网络课程上,我学到了很多有关IP的知识.IP全称叫网际…

Problem F. Wiki with StringInput file: standard input Time limit: 1 secondOutput file: standard output Memory limit: 256 megabytes现在有一个字符串s, s中只包含数字字符0-9,现在需要输出一个子字符串k满足以下条件:条件1: k包含0-9中所有的数字字符:条件2:在所有符合要求的子字符串中, k的长度最小:条件3:如果存在多个满足条件1和条件2的子字符串,请输出字典…

Home Web Board ProblemSet Standing Status Statistics   Problem F: 求平均年龄 Problem F: 求平均年龄 Time Limit: 1 Sec  Memory Limit: 128 MBSubmit: 720  Solved: 394[Submit][Status][Web Board] Description 定义一个Persons类,用于保存若干个人的姓名(string类型)和年龄(int类型),定义其方法 void ad…

Problem F Funny Car Racing There is a funny car racing in a city with n junctions and m directed roads. The funny part is: each road is open and closed periodically. Each road is associate with two integers (a, b), that means the road will be open fo…