http://acm.sdut.edu.cn/sdutoj/problem.php?action=showproblem&problemid=1646 题意 : 话说我根本没读题,,,因为实在是太长了,我去看了输入输出才知道题讲的什么,大意是说给你一串运算式,里边包含了很多的多余的括号,让你去掉那些多余的括号,但是不能改变原来的式子中字母和运算符的位置. 思路 :比赛的时候根本没做出来,当时并没有什么思路,一开始是单纯的以为模拟,但是想了想又不太是,所以没敢去做,这个题最重要的就是找到运算符的优…

http://poj.org/problem?id=1400 题意:给出一个表达式可能含有多余的括号,去掉多余的括号,输出它的最简形式. 思路:先将表达式转化成后缀式,因为后缀式不含括号,然后再转化成中缀式,并根据运算符的优先级添加括号. #include <stdio.h> #include <string.h> #include <string> #include <stack> #include <iostream> using names…

原地址 http://www.cplusplus.com/doc/tutorial/pointers/ Pointers In earlier chapters, variables have been explained as locations in the computer's memory which can be accessed by their identifier (their name). This way, the program does not need to care…

原 Impala SQL 语言元素(翻译) 本文来源于http://my.oschina.net/weiqingbin/blog/189413#OSC_h2_2 摘要 http://www.cloudera.com/content/cloudera-content/cloudera-docs/Impala/latest/Installing-and-Using-Impala/ciiu_langref_sql.html 目录[-] Impala SQL 语言元素(Elements) ALTER T…

C++ Core Guidelines September 9, 2015 Editors: Bjarne Stroustrup Herb Sutter This document is a very early draft. It is inkorrekt, incompleat, and pµøoorly formatted. Had it been an open source (code) project, this would have been release 0.6. Copy…

摘要: http://www.cloudera.com/content/cloudera-content/cloudera-docs/Impala/latest/Installing-and-Using-Impala/ciiu_langref_sql.html Impala SQL 语言元素(Elements) Impala SQL 方言支持一组标准元素(a range of standard elements),加上许多大数据方面的扩展,用于数据加载和数据仓库方面.   注意: 在之前的 Im…

Book Imformation : <Pratical Programming : An Introduction to Computer Science Using Python 3> 2nd Edtion Author : Paul Gries,Jennifer Campbell,Jason Montojo Page : Chapter 2.3 to Chapter 2.5 1.A type consists of two things: (1).a set of values (2).…

see how any formula was written in any question or answer, including this one, right-click on the expression it and choose "Show Math As > TeX Commands". (When you do this, the '$' will not display. Make sure you add these. See the next point…

Cron Expressions Cron-Expressions are used to configure instances ofCronTrigger. Cron-Expressions are strings that are actually made up of sevensub-expressions, that describe individual details of the schedule. These sub-expressionare separated with…

在编写处理字符串的程序或网页时,经常会有查找符合某些复杂规则的字符串的需要.正则表达式就是用于描述这些规则的工具.换句话说,正则表达式就是记录文本规则的代码. 很可能你使用过Windows/Dos下用于文件查找的通配符(wildcard),也就是*和?.如果你想查找某个目录下的所有的Word文档的话,你会搜索*.doc.在这里,*会被解释成任意的字符串.和通配符类似,正则表达式也是用来进行文本匹配的工具,只不过比起通配符,它能更精确地描述你的需求——当然,代价就是更复杂——比如你可以编写一个正则…