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POJ 2749 Building roads 2-sat+二分答案
把爱恨和最大距离视为限制条件,可以知道,最大距离和限制条件多少具有单调性 所以可以二分最大距离,加边+check ...
分类:其他好文   时间:2017-11-18 11:18:25    阅读次数:128
?《数据库系统概念》5-连接、视图和事务
一、连接a)inner join中,on,可以用where替代,但用on来专门指定join条件,其它条件写在where中可读性更好。b)outer join对于连接字段为空的元祖,使用inner join时不会列出,outer join却不一样,left /right join会保留左(右)侧的连接 ...
分类:数据库   时间:2017-11-17 23:26:43    阅读次数:189
CF | Alyona and Numbers
After finishing eating her bun, Alyona came up with two integers n and m. She decided to write down two columns of integers — the first column contain ...
分类:其他好文   时间:2017-11-17 21:41:04    阅读次数:149
并发服务器(多进程版本)
这个服务器版本提供了accept返回EINTR错误继续执行的机制,保证了稳定性,而且其创建的子进程服务进程也会被正常的回收掉。 子进程结束会给父进程返回一个SIGCHID信号,父进程捕获到这个信号之后会执行信号处理函数,进行子进程的回收。 ...
分类:系统相关   时间:2017-11-17 19:55:01    阅读次数:145
PDO的bindParam与bindValue的区别
转自:https://stackoverflow.com/questions/1179874/what is the difference between bindparam and bindvalue answer 5077108 PDOStatement::bindParam 与 PDOStat ...
分类:其他好文   时间:2017-11-17 16:16:39    阅读次数:130
053-298
While tuning a SQL statement, the SQL Tuning Advisor finds an existing SQL profile for the statement that has stale statistics available.What would th ...
分类:其他好文   时间:2017-11-17 14:58:02    阅读次数:107
724. Find Pivot Index 查找枢轴索引
Given an array of integers nums, write a method that returns the "pivot" index of this array.We define the pivot index as the index where the sum of t... ...
分类:其他好文   时间:2017-11-16 23:52:47    阅读次数:296
053-105
Which statements are true regarding table compression? (Choose all that apply.)A. It saves disk space and reduces memory usage.B. It saves disk space ...
分类:其他好文   时间:2017-11-16 18:40:29    阅读次数:112
053-218
Your database is running in ARCHIVELOG mode. You are performing a user-managed backup of the DATA1 tablespace. You place the DATA1 tablespace in backu ...
分类:其他好文   时间:2017-11-16 18:32:16    阅读次数:112
053-3
Your database is in ARCHIVELOG mode. You have two online redo log groups, each of which contains one redo member. When you attempt to start the databa ...
分类:其他好文   时间:2017-11-16 17:25:09    阅读次数:198
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