C++博客-为你写诗http://www.cppblog.com/xuesong/c/c++zh-cnSun, 05 Apr 2026 14:43:43 GMTSun, 05 Apr 2026 14:43:43 GMT60DES加密算法http://www.cppblog.com/xuesong/archive/2011/10/13/158231.htmlpp_zhangpp_zhangThu, 13 Oct 2011 08:49:00 GMThttp://www.cppblog.com/xuesong/archive/2011/10/13/158231.htmlhttp://www.cppblog.com/xuesong/comments/158231.htmlhttp://www.cppblog.com/xuesong/archive/2011/10/13/158231.html#Feedback1http://www.cppblog.com/xuesong/comments/commentRss/158231.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/158231.html阅读全文

pp_zhang 2011-10-13 16:49 发表评论
]]>给新手程序员的一封信(转)http://www.cppblog.com/xuesong/archive/2011/10/12/158176.htmlpp_zhangpp_zhangWed, 12 Oct 2011 15:40:00 GMThttp://www.cppblog.com/xuesong/archive/2011/10/12/158176.htmlhttp://www.cppblog.com/xuesong/comments/158176.htmlhttp://www.cppblog.com/xuesong/archive/2011/10/12/158176.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/158176.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/158176.html阅读全文

pp_zhang 2011-10-12 23:40 发表评论
]]>windows/ubuntu下g++命令行使用http://www.cppblog.com/xuesong/archive/2011/08/05/152597.htmlpp_zhangpp_zhangFri, 05 Aug 2011 15:02:00 GMThttp://www.cppblog.com/xuesong/archive/2011/08/05/152597.htmlhttp://www.cppblog.com/xuesong/comments/152597.htmlhttp://www.cppblog.com/xuesong/archive/2011/08/05/152597.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/152597.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/152597.html阅读全文

pp_zhang 2011-08-05 23:02 发表评论
]]>C++中成员初始化列表的使用(转载)http://www.cppblog.com/xuesong/archive/2011/08/05/152526.htmlpp_zhangpp_zhangFri, 05 Aug 2011 03:12:00 GMThttp://www.cppblog.com/xuesong/archive/2011/08/05/152526.htmlhttp://www.cppblog.com/xuesong/comments/152526.htmlhttp://www.cppblog.com/xuesong/archive/2011/08/05/152526.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/152526.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/152526.html阅读全文

pp_zhang 2011-08-05 11:12 发表评论
]]>scanf的用法归纳http://www.cppblog.com/xuesong/archive/2011/07/31/152172.htmlpp_zhangpp_zhangSun, 31 Jul 2011 12:13:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/31/152172.htmlhttp://www.cppblog.com/xuesong/comments/152172.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/31/152172.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/152172.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/152172.html阅读全文

pp_zhang 2011-07-31 20:13 发表评论
]]>windows下的墙翻http://www.cppblog.com/xuesong/archive/2011/07/28/151970.htmlpp_zhangpp_zhangThu, 28 Jul 2011 02:40:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/28/151970.htmlhttp://www.cppblog.com/xuesong/comments/151970.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/28/151970.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151970.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151970.html阅读全文

pp_zhang 2011-07-28 10:40 发表评论
]]>位运算的用处搜集http://www.cppblog.com/xuesong/archive/2011/07/26/151849.htmlpp_zhangpp_zhangTue, 26 Jul 2011 01:57:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/26/151849.htmlhttp://www.cppblog.com/xuesong/comments/151849.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/26/151849.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151849.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151849.html阅读全文

pp_zhang 2011-07-26 09:57 发表评论
]]>c++中的内联函数（inline）http://www.cppblog.com/xuesong/archive/2011/07/22/151630.htmlpp_zhangpp_zhangFri, 22 Jul 2011 06:01:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/22/151630.htmlhttp://www.cppblog.com/xuesong/comments/151630.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/22/151630.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151630.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151630.html阅读全文

pp_zhang 2011-07-22 14:01 发表评论
]]>卡塔兰数http://www.cppblog.com/xuesong/archive/2011/07/21/151568.htmlpp_zhangpp_zhangThu, 21 Jul 2011 13:05:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/21/151568.htmlhttp://www.cppblog.com/xuesong/comments/151568.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/21/151568.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151568.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151568.html阅读全文

pp_zhang 2011-07-21 21:05 发表评论
]]>树状数组的理解和应用http://www.cppblog.com/xuesong/archive/2011/07/21/151567.htmlpp_zhangpp_zhangThu, 21 Jul 2011 12:34:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/21/151567.htmlhttp://www.cppblog.com/xuesong/comments/151567.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/21/151567.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151567.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151567.html阅读全文

pp_zhang 2011-07-21 20:34 发表评论
]]>memset函数用法详解和错误解析http://www.cppblog.com/xuesong/archive/2011/07/21/151532.htmlpp_zhangpp_zhangThu, 21 Jul 2011 03:00:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/21/151532.htmlhttp://www.cppblog.com/xuesong/comments/151532.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/21/151532.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151532.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151532.html阅读全文

pp_zhang 2011-07-21 11:00 发表评论
]]>生成下一个排列的字典序法http://www.cppblog.com/xuesong/archive/2011/07/18/151315.htmlpp_zhangpp_zhangMon, 18 Jul 2011 09:19:00 GMThttp://www.cppblog.com/xuesong/archive/2011/07/18/151315.htmlhttp://www.cppblog.com/xuesong/comments/151315.htmlhttp://www.cppblog.com/xuesong/archive/2011/07/18/151315.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/151315.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/151315.html阅读全文

pp_zhang 2011-07-18 17:19 发表评论
]]>JavaScript 获取客户端计算机硬件及系统信息 http://www.cppblog.com/xuesong/archive/2011/06/18/148895.htmlpp_zhangpp_zhangSat, 18 Jun 2011 01:44:00 GMThttp://www.cppblog.com/xuesong/archive/2011/06/18/148895.htmlhttp://www.cppblog.com/xuesong/comments/148895.htmlhttp://www.cppblog.com/xuesong/archive/2011/06/18/148895.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/148895.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/148895.html阅读全文

pp_zhang 2011-06-18 09:44 发表评论
]]>java添加快捷键和外观设置http://www.cppblog.com/xuesong/archive/2011/06/15/148734.htmlpp_zhangpp_zhangWed, 15 Jun 2011 12:08:00 GMThttp://www.cppblog.com/xuesong/archive/2011/06/15/148734.htmlhttp://www.cppblog.com/xuesong/comments/148734.htmlhttp://www.cppblog.com/xuesong/archive/2011/06/15/148734.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/148734.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/148734.html阅读全文

pp_zhang 2011-06-15 20:08 发表评论
]]>C++编码中减少内存缺陷的方法和工具http://www.cppblog.com/xuesong/archive/2011/06/14/148628.htmlpp_zhangpp_zhangTue, 14 Jun 2011 06:39:00 GMThttp://www.cppblog.com/xuesong/archive/2011/06/14/148628.htmlhttp://www.cppblog.com/xuesong/comments/148628.htmlhttp://www.cppblog.com/xuesong/archive/2011/06/14/148628.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/148628.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/148628.html阅读全文

pp_zhang 2011-06-14 14:39 发表评论
]]>assert用法http://www.cppblog.com/xuesong/archive/2011/06/10/148474.htmlpp_zhangpp_zhangFri, 10 Jun 2011 15:50:00 GMThttp://www.cppblog.com/xuesong/archive/2011/06/10/148474.htmlhttp://www.cppblog.com/xuesong/comments/148474.htmlhttp://www.cppblog.com/xuesong/archive/2011/06/10/148474.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/148474.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/148474.html阅读全文

pp_zhang 2011-06-10 23:50 发表评论
]]>快速幂http://www.cppblog.com/xuesong/archive/2011/06/10/148473.htmlpp_zhangpp_zhangFri, 10 Jun 2011 15:12:00 GMThttp://www.cppblog.com/xuesong/archive/2011/06/10/148473.htmlhttp://www.cppblog.com/xuesong/comments/148473.htmlhttp://www.cppblog.com/xuesong/archive/2011/06/10/148473.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/148473.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/148473.html阅读全文

pp_zhang 2011-06-10 23:12 发表评论
]]>c++ 输入函数的比较和运用http://www.cppblog.com/xuesong/archive/2011/05/28/147532.htmlpp_zhangpp_zhangSat, 28 May 2011 14:08:00 GMThttp://www.cppblog.com/xuesong/archive/2011/05/28/147532.htmlhttp://www.cppblog.com/xuesong/comments/147532.htmlhttp://www.cppblog.com/xuesong/archive/2011/05/28/147532.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/147532.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/147532.html阅读全文

pp_zhang 2011-05-28 22:08 发表评论
]]>欧拉函数、欧拉定理、费马定理http://www.cppblog.com/xuesong/archive/2011/05/22/146895.htmlpp_zhangpp_zhangSat, 21 May 2011 16:01:00 GMThttp://www.cppblog.com/xuesong/archive/2011/05/22/146895.htmlhttp://www.cppblog.com/xuesong/comments/146895.htmlhttp://www.cppblog.com/xuesong/archive/2011/05/22/146895.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/146895.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/146895.html阅读全文

pp_zhang 2011-05-22 00:01 发表评论
]]>计算几何资料http://www.cppblog.com/xuesong/archive/2011/05/21/146893.htmlpp_zhangpp_zhangSat, 21 May 2011 15:55:00 GMThttp://www.cppblog.com/xuesong/archive/2011/05/21/146893.htmlhttp://www.cppblog.com/xuesong/comments/146893.htmlhttp://www.cppblog.com/xuesong/archive/2011/05/21/146893.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/146893.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/146893.html阅读全文

pp_zhang 2011-05-21 23:55 发表评论
]]>学习算法之路http://www.cppblog.com/xuesong/archive/2011/05/21/146891.htmlpp_zhangpp_zhangSat, 21 May 2011 15:53:00 GMThttp://www.cppblog.com/xuesong/archive/2011/05/21/146891.htmlhttp://www.cppblog.com/xuesong/comments/146891.htmlhttp://www.cppblog.com/xuesong/archive/2011/05/21/146891.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/146891.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/146891.html阅读全文

pp_zhang 2011-05-21 23:53 发表评论
]]>c++内存错误http://www.cppblog.com/xuesong/archive/2011/05/15/146436.htmlpp_zhangpp_zhangSun, 15 May 2011 15:30:00 GMThttp://www.cppblog.com/xuesong/archive/2011/05/15/146436.htmlhttp://www.cppblog.com/xuesong/comments/146436.htmlhttp://www.cppblog.com/xuesong/archive/2011/05/15/146436.html#Feedback2http://www.cppblog.com/xuesong/comments/commentRss/146436.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/146436.html阅读全文

pp_zhang 2011-05-15 23:30 发表评论
]]>独立博客http://www.cppblog.com/xuesong/archive/2011/05/07/145918.htmlpp_zhangpp_zhangSat, 07 May 2011 14:49:00 GMThttp://www.cppblog.com/xuesong/archive/2011/05/07/145918.htmlhttp://www.cppblog.com/xuesong/comments/145918.htmlhttp://www.cppblog.com/xuesong/archive/2011/05/07/145918.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/145918.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/145918.html阅读全文

pp_zhang 2011-05-07 22:49 发表评论
]]>poj1753---Flip game解题报告http://www.cppblog.com/xuesong/archive/2011/04/28/145258.htmlpp_zhangpp_zhangThu, 28 Apr 2011 15:36:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/28/145258.htmlhttp://www.cppblog.com/xuesong/comments/145258.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/28/145258.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/145258.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/145258.html阅读全文

pp_zhang 2011-04-28 23:36 发表评论
]]>最长递增子序列dphttp://www.cppblog.com/xuesong/archive/2011/04/23/144858.htmlpp_zhangpp_zhangSat, 23 Apr 2011 08:54:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/23/144858.htmlhttp://www.cppblog.com/xuesong/comments/144858.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/23/144858.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/144858.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/144858.html
其实这个问题和前面的最长公共子序列问题还是有一定的关联的。假设我们的初始的序列S1。那我们从小到大先排序一下。得到了S1'。这样我们再球S1和S1'的最长公共子序列就可以知道答案了：）是不是有点巧妙啊。这个过程还是比较直观的。但是这个不是这次要说的重点，这个问题有比较传统的做法的.

我们定义L(j)是一个优化的子结构,也就是最长递增子序列.那么L(j)和L(1..j-1)的关系可以描述成

  阅读全文

pp_zhang 2011-04-23 16:54 发表评论
]]>资料查询http://www.cppblog.com/xuesong/archive/2011/04/23/144821.htmlpp_zhangpp_zhangSat, 23 Apr 2011 01:44:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/23/144821.htmlhttp://www.cppblog.com/xuesong/comments/144821.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/23/144821.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/144821.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/144821.html阅读全文

pp_zhang 2011-04-23 09:44 发表评论
]]>poj-1401Factorial 解题报告http://www.cppblog.com/xuesong/archive/2011/04/19/144585.htmlpp_zhangpp_zhangTue, 19 Apr 2011 13:31:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/19/144585.htmlhttp://www.cppblog.com/xuesong/comments/144585.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/19/144585.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/144585.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/144585.html阅读全文

pp_zhang 2011-04-19 21:31 发表评论
]]>poj 2668 -- Defending Castle解题报告http://www.cppblog.com/xuesong/archive/2011/04/19/144584.htmlpp_zhangpp_zhangTue, 19 Apr 2011 13:27:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/19/144584.htmlhttp://www.cppblog.com/xuesong/comments/144584.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/19/144584.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/144584.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/144584.html阅读全文

pp_zhang 2011-04-19 21:27 发表评论
]]>程序员的十层楼 （转） http://www.cppblog.com/xuesong/archive/2011/04/14/144241.htmlpp_zhangpp_zhangThu, 14 Apr 2011 12:39:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/14/144241.htmlhttp://www.cppblog.com/xuesong/comments/144241.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/14/144241.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/144241.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/144241.html自西方文艺复兴以来，中国在自然科学方面落后西方很多，软件领域也不例外。当然现在中国的许多程序员们对此可能有许多不同的意见，有些人认为中国的程序员水平远落后于西方，有些则认为中国的程序员个人能力并不比西方的程序员差，只是整个软件产业落后而已。

那么，到底中国的程序员水平比西方程序员水平差，还是中国有许多优秀的程序员达到或超过了西方程序员同等水平呢？要解决这个问题，必须先知道程序员 有多少种技术层级，每个层级需要什么样的技术水平，然后再比较中国和西方在各个技术层级的人数，就可以知道到底有没有差距，差距有多大。

当然，对于如何划分程序员的技术层级，不同公司或不同人会有不同的划分标准，下面的划分仅代表个人的观点，如有不当之处，还请砸板砖予以纠正。

第 1层 菜鸟

第1层楼属于地板层，迈进这层楼的门槛是很低的。基本上懂计算机的基本操作，了解计算机专业的一些基础知识，掌握一门基本的编程语言如 C/C++，或者Java，或者javascript，…，均可入门迈进这层。
  阅读全文

pp_zhang 2011-04-14 20:39 发表评论
]]>acm中数据表示http://www.cppblog.com/xuesong/archive/2011/04/14/144203.htmlpp_zhangpp_zhangThu, 14 Apr 2011 06:40:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/14/144203.htmlhttp://www.cppblog.com/xuesong/comments/144203.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/14/144203.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/144203.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/144203.html　　那遇到比40亿要大的数怎么办呢？这时就要用到C++的64位扩展了。不同的编译器对64位整数的扩展有所不同。基于ACM的需要，下面仅介绍VC6.0与g++编译器的扩展。
　　VCVC6.0的64位整数分别叫做__int64与unsigned __int64，其范围分别是[-2^63, 2^63)与[0,2^64)，即-9223372036854775808~9223372036854775807与0~18446744073709551615(约1800亿亿)。对64位整数的运算与32位整数基本相同，都支持四则运算与位运算等。  阅读全文

pp_zhang 2011-04-14 14:40 发表评论
]]>如何学好c语言http://www.cppblog.com/xuesong/archive/2011/04/05/143432.htmlpp_zhangpp_zhangTue, 05 Apr 2011 02:46:00 GMThttp://www.cppblog.com/xuesong/archive/2011/04/05/143432.htmlhttp://www.cppblog.com/xuesong/comments/143432.htmlhttp://www.cppblog.com/xuesong/archive/2011/04/05/143432.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/143432.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/143432.html2. 大量的封装好的类库也屏蔽了很多实现细节。

一段时间后，你会发现你知其然，不知所以然。。我以前在CSDN上写过一篇《Java NIO类库Selector机制解析（上，下，续）》，在那篇文章中我说提到过（有讥讽的语气）Java的程序员不懂底层实现，所以很难把技术学得更扎实。此时，一部分程序员会不自然地想学学底层的技术，很自然的，C语言就被提了上来。  阅读全文

pp_zhang 2011-04-05 10:46 发表评论
]]>vim使用http://www.cppblog.com/xuesong/archive/2011/03/27/142777.htmlpp_zhangpp_zhangSat, 26 Mar 2011 16:56:00 GMThttp://www.cppblog.com/xuesong/archive/2011/03/27/142777.htmlhttp://www.cppblog.com/xuesong/comments/142777.htmlhttp://www.cppblog.com/xuesong/archive/2011/03/27/142777.html#Feedback0http://www.cppblog.com/xuesong/comments/commentRss/142777.htmlhttp://www.cppblog.com/xuesong/services/trackbacks/142777.html  阅读全文

pp_zhang 2011-03-27 00:56 发表评论
]]>