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Finding all cycles in a directed graph
...owing link:
http://www.cs.tufts.edu/comp/150GA/homeworks/hw1/Johnson%2075.PDF
A java implementation can be found in:
http://normalisiert.de/code/java/elementaryCycles.zip
A Mathematica demonstration of Johnson's algorithm can be found here, implementation can be downloaded from the right ("Downl...
微博为什么限制140字(附短信70字限制考) - 创意 - 清泛网 - 专注C/C++及内核技术
...的专家，或者这位新浪微博的副主编（原来新浪微博是有编辑的啊），还有各种论坛、百度知道提问等等，都不足以让人信服，考据癖没能得到满足，只好自己来考据一番。
twitter说
We like to keep it short and sweet! It also just so hap...
Paperclip::Errors::MissingRequiredValidatorError with Rails 4
... Paperclip will also throw "Missing Required Validator Error" in case of PDF file upload. The workaround for that is: First install the "GhostScript" and then add "application/pdf" to content-type.
– HackerKarma
Mar 10 '14 at 15:41
...
How do I upload a file with metadata using a REST web service?
...8029299
Content-Disposition: form-data; name="name"; filename="myfilename.pdf"
Content-Type: application/octet-stream
%PDF-1.4
%
2 0 obj
<</Length 57/Filter/FlateDecode>>stream
x+r
26S00SI2P0Qn
F
!i\
)%!Y0i@.k
[
endstream
endobj
4 0 obj
<</Type/Page/MediaBox[0 0 595 842]/Resourc...
tcp端口状态ESTABLISHED、TIME_WAIT、CLOSE_WAIT 、SYN_RECV等详解 - C/C++...
...缩短TIME_WAIT的等待时间
ubuntu机器设置
vi /etc/sysctl.conf
编辑文件，加入以下内容：
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_fin_timeout = 30
然后执行 /sbin/sysctl -p 让参数生效。
net.ipv4.tcp_sy...
File Upload ASP.NET MVC 3.0
...GetExtension(Request.Files[0].FileName).ToLower();
if (extension != ".pdf" && extension != ".doc" && extension != ".docx" && extension != ".rtf" && extension != ".txt")
{
ModelState.AddModelError("uploadError", "Supported file extensions: pdf, doc, do...
Pandoc markdown page break
... to use raw LaTeX \newpage. This works perfectly when outputting LaTeX (or pdf created through LaTeX). However, one will run into problems when targeting different formats like HTML or docx.
A simple solution when targeting other formats is to use a pandoc filter which can transform the internal do...
Apache两种工作模式区别及配置切换 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...pache两种工作模式区别及配置切换1、Redhat Linux下查看apache版本号在Apache安装目录bin下，使用以下命令查看即可。使用命令：. httpd -v示例：2、查看Apache当前工作模...1、Redhat Linux下查看apache版本号
在Apache安装目录bin下，使用以下...
Specifying and saving a figure with exact size in pixels
...I is not supported by all backends. Here, the PNG backend is used, but the pdf and ps backends will implement the size differently. Also, changing the DPI and sizes will also affect things like fontsize. A larger DPI will keep the same relative sizes of fonts and elements, but if you want smaller fo...
MFC中ComboBox控件的使用 - C/C++ - 清泛网 - 专注C/C++及内核技术
...：
if(GetFocus()==GetDlgItem(IDC_EDIT_VALUE2))//判断焦点是否在编辑框IDC_EDIT_VALUE2内
但是combobox 的焦点不同，因为它是由edit和listbox两部分组成的
所以获得焦点要用GetParent()：
if((GetFocus()->GetParent())==GetDlgItem(IDC_COMBO_CF)) ...
控制Combo B...