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Algorithm to return all combinations of k elements from n
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Art of Computer Programming Volume 4: Fascicle 3 has a ton of these that might fit your particular situation better than how I describe.
Gray Codes
An issue that you will come across is of course memory and pretty quickly, you'll have problems by ...
This version of the application is not configured for billing through Google Play
When I try to run my application with in-app billing I am getting the error: "This version of the application is not configured for billing through Google Play. Check the help center for more information".
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How to use XPath in Python?
...iquity. The libxml2 library is pervasive and thus well tested.
Downsides include:
Compliance to the spec. It's strict. Things like default namespace handling are easier in other libraries.
Use of native code. This can be a pain depending on your how your application is distributed / deployed. RP...
Archives not showing up in Organizer for Xcode 4
I'm trying to create an IPA in Xcode 4, much like the person who asked this question:
20 Answers
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java.util.regex - importance of Pattern.compile()?
...nce of Pattern.compile() method?
Why do I need to compile the regex string before getting the Matcher object?
8 Answe...
How do you track record relations in NoSQL?
I am trying to figure out the equivalent of foreign keys and indexes in NoSQL KVP or Document databases. Since there are no pivotal tables (to add keys marking a relation between two objects) I am really stumped as to how you would be able to retrieve data in a way that would be useful for normal we...
What are “named tuples” in Python?
Reading the changes in Python 3.1 , I found something... unexpected:
11 Answers
11
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Differences in boolean operators: & vs && and | vs ||
... rules for && and || but what are & and | ? Please explain these to me with an example.
11 Answers
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Always pass weak reference of self into block in ARC?
I am a little confused about block usage in Objective-C. I currently use ARC and I have quite a lot of blocks in my app, currently always referring to self instead of its weak reference. May that be the cause of these blocks retaining self and keeping it from being dealloced ? The question is, s...
Delete all but the most recent X files in bash
Is there a simple way, in a pretty standard UNIX environment with bash, to run a command to delete all but the most recent X files from a directory?
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