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How is set() implemented?
I've seen people say that set objects in python have O(1) membership-checking. How are they implemented internally to allow this? What sort of data structure does it use? What other implications does that implementation have?
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java: HashMap not working
HashMap<String, int> doesn't seem to work but HashMap<String, Integer> does work.
Any ideas why?
5 Answers
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Best way to merge two maps and sum the values of same key?
I want to merge them, and sum the values of same keys. So the result will be:
15 Answers
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AVAudioPlayer throws breakpoint in debug mode
Every time I load the app it stops as if I had set a breakpoint on this line:
6 Answers
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Remove a character from the end of a variable
Bash auto completion appends a / at the end of a directory name. How I can strip this off from a positional parameter?
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PostgreSQL query to return results as a comma separated list
Let say you have a SELECT id from table query (the real case is a complex query) that does return you several results.
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How do I “commit” changes in a git submodule? [duplicate]
I have, in my naivety, set up a git submodule and treated it like a Subversion external - i.e. it's now full of changes that I've just realized haven't been committed or pushed anywhere.
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git add only modified changes and ignore untracked files
I ran "git status" and listed below are some files that were modified/or under the heading "changes not staged for commit".
It also listed some untracked files that I want to ignore (I have a ".gitignore" file in these directories).
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How do you use gcc to generate assembly code in Intel syntax?
The gcc -S option will generate assembly code in AT&T syntax, is there a way to generate files in Intel syntax? Or is there a way to convert between the two?
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TSQL Pivot without aggregate function
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You can use the MAX aggregate, it would still work. MAX of one value = that value..
In this case, you could also self join 5 times on customerid, filter by dbColumnName per table reference. It may work out better.
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