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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:
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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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Remove HTML Tags from an NSString on the iPhone
There are a couple of different ways to remove HTML tags from an NSString in Cocoa .
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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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How do I “commit” changes in a git submodule? [duplim>cat m>e]
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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MySQL/SQL: Group by date only on a Datetime column
Having a table with a column like: mydate DATETIME ...
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Missing include “bits/c++config.h” when cross compiling 64 bit program on 32 bit in Ubuntu
I am running the 32bit version of Ubuntu 10.10 and trying to cross compile to a 64 bit target. Based on my research, I have installed the g++-multilib package.
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Pandas get topmost n records within each group
Suppose I have pandas DataFrame like this:
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