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What would cause an algorithm to have O(log log n) complexity?
...ach of which holds roughly √(√ N) elements. To traverse the tree, you start at the root, determine which bucket you belong to, then recursively continue in the appropriate subtree. Due to the way the vEB-tree is structured, you can determine in O(1) time which subtree to descend into, and so a...
Understanding the Rails Authenticity Token
...generated for the user - given that they have gotten access to the session started by the user for Service A?
– marcamillion
Oct 25 '10 at 22:18
11
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Convert a Git folder to a submodule retrospectively?
...etch . +refs/original/*:*).
I have a project with a utils library that's started to be useful in other projects, and wanted to split its history off into a submodules. Didn't think to look on SO first so I wrote my own, it builds the history locally so it's a good bit faster, after which if you w...
C++ - passing references to std::shared_ptr or boost::shared_ptr
...lt; *msg << std::endl;
previous_message = msg;
}
So, before we start sending we discard the current previous message, and then after the send is complete we can store the new previous message. All good. Here's some test code:
send_message(std::shared_ptr<std::string>(new std::stri...
What is the real overhead of try/catch in C#?
...ing the try statement must be complete, which requires a thread lock for a start, making it useful for debugging race conditions!
the compiler isn't allowed to:
eliminate unused variable assignments which have definitely been assigned to before the try statement
reorganise or coalesce any of it's ...
Read/write to Windows registry using Java
...er reader = new StreamReader(process.getInputStream());
reader.start();
process.waitFor();
reader.join();
String output = reader.getResult();
// Output has the following format:
// \n<Version information>\n\n<key>\t...
使用虚拟现实和App Inventor进行实验 · App Inventor 2 中文网
...非常简单 - 就 App Inventor 编程块而言。它们仅使用 ActivityStarter 组件来启动与 MITVRHelper 辅助应用程序一起打包的活动之一。ActivityStarter 需要指定要启动哪个活动，以及要处理哪个全景图或对象模型文件。通过设置 ActivityStarter 的 ...
How do function pointers in C work?
...
Function pointers in C
Let's start with a basic function which we will be pointing to:
int addInt(int n, int m) {
return n+m;
}
First thing, let's define a pointer to a function which receives 2 ints and returns an int:
int (*functionPtr)(int,int...
What do Clustered and Non clustered index actually mean?
...the books. If the DDS# for the book you want was 005.7565 F736s, you would start by locating the row of bookshelves that is labeled 001-099 or something like that. (This endcap sign at the end of the stack corresponds to an "intermediate node" in the index.) Eventually you would drill down to the sp...
Update relationships when saving changes of EF4 POCO objects
...e you have to do this for a few different aggregates in a large system you start to realize there must be a better, more generic way.
Please take a look and see if it can help http://refactorthis.wordpress.com/2012/12/11/introducing-graphdiff-for-entity-framework-code-first-allowing-automated-upda...