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Concurrent HashSet in .NET Framework?
...ortunately. However, there are some workarounds.
ConcurrentDictionary (recommended)
This first one is to use the class ConcurrentDictionary<TKey, TValue> in the namespace System.Collections.Concurrent. In the case, the value is pointless, so we can use a simple byte (1 byte in memory).
pri...
Alarm 闹钟扩展：在指定时间启动App的强大工具 · App Inventor 2 中文网
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尽管Android文档强烈建议使用通知（参见 developer.android.com），但在某些情况下，仍然需要在特定时间启动应用程序。使用此扩展，可以在指定时间启动应用程序。如果您想定时生成通知，必须使用扩展 UrsAI2Notifier。
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Pseudo-terminal will not be allocated because stdin is not a terminal
...nd -t -t are equivalent; specifying args separately or smooshed together becomes a matter of personal style/preference, and when it comes down to it, there are valid arguments for doing it either way. but really, it is just personal preference.
– JDS
Nov 3 '15 ...
How to iterate over arguments in a Bash script
I have a complex command that I'd like to make a shell/bash script of. I can write it in terms of $1 easily:
8 Answers
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How are Python's Built In Dictionaries Implemented?
... together (probably more than anyone would like to know; but the answer is comprehensive).
Python dictionaries are implemented as hash tables.
Hash tables must allow for hash collisions i.e. even if two distinct keys have the same hash value, the table's implementation must have a strategy to inse...
What goes into the “Controller” in “MVC”?
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That dialogue is the best explanation of MVC I've come across, thanks!
– Paul Walker
Jun 23 '09 at 23:41
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What REALLY happens when you don't free after malloc?
...d when you're done. Also, database handles should have their transactions committed and then closed when you're done with them. Similarly, if you're using an object oriented language like C++ or Objective C, not freeing an object when you're done with it will mean the destructor will never get cal...
How can I color Python logging output?
...ous value, before returning the formatted string (credit to Michael in the comments).
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design a stack such that getMinimum( ) should be O(1)
...re's a solution which doesn't do that though, without wrecking the runtime complexity somewhere (e.g. making push/pop O(n)). Note that this doesn't change the complexity of the space required, e.g. if you've got a stack with O(n) space requirements, this will still be O(n) just with a different cons...
How does BLAS get such extreme performance?
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A good starting point is the great book The Science of Programming Matrix Computations by Robert A. van de Geijn and Enrique S. Quintana-Ortí. They provide a free download version.
BLAS is divided into three levels:
Level 1 defines a set of linear algebra functions that operate on vectors only. ...