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Best algorithm for detecting cycles in a directed graph [closed]
... complexity.
For other algorithms, see Strongly connected components on Wikipedia.
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Avoiding instanceof in Java
...mazon blog: "when polymorphism fails". Essentially he's addressing cases like this, when polymorphism causes more trouble than it solves.
The issue is that to use polymorphism you have to make the logic of "handle" part of each 'switching' class - i.e. Integer etc. in this case. Clearly this is no...
How would you do a “not in” query with LINQ?
...exist in the second list. With SQL I would just use "not in", but I do not know the equivalent in LINQ. How is that done?
1...
Getting the HTTP Referrer in ASP.NET
I'm looking for a quick, easy and reliable way of getting the browser's HTTP Referrer in ASP.Net ( C# ). I know the HTTP Referrer itself is unreliable, but I do want a reliable way of getting the referrer if it is present.
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How do I get a value of datetime.today() in Python that is “timezone aware”?
...tz library, which has a constantly updated database of most timezones.
Working with local timezones can be very tricky (see "Further reading" links below), so you may rather want to use UTC throughout your application, especially for arithmetic operations like calculating the difference between two...
How to verify if a file exists in a batch file?
...
You can use IF EXIST to check for a file:
IF EXIST "filename" (
REM Do one thing
) ELSE (
REM Do another thing
)
If you do not need an "else", you can do something like this:
set __myVariable=
IF EXIST "C:\folder with space\myfile.txt" set __myV...
Difference between e.target and e.currentTarget
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Ben is completely correct in his answer - so keep what he says in mind. What I'm about to tell you isn't a full explanation, but it's a very easy way to remember how e.target, e.currentTarget work in relation to mouse events and the display list:
e.target = The thing u...
Naming threads and thread-pools of ExecutorService
Let's say I have an application that utilizes the Executor framework as such
17 Answers
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Extract date (yyyy/mm/dd) from a timestamp in PostgreSQL
...he difference between them is that the latter returns the same data type like timestamptz keeping your time zone intact (if you need it).
=> select date_trunc('day', now());
date_trunc
------------------------
2015-12-15 00:00:00+02
(1 row)
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differences between 2 JUnit Assert classes
The JUnit framework contains 2 Assert classes (in different packages, obviously) and the methods on each appear to be very similar. Can anybody explain why this is?
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