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HashSet versus Dictionary w.r.t searching time to find if an item exists
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Contrary to what the previous comments seem to imply, yes, you should switch to HashSet because it gives you what you want: storing a set of values (as opposed to maintaining some kind of mapping). This answer indicates that there will be no negative impa...
How do I use CMake?
I am trying to use CMake in order to compile opencv.
4 Answers
4
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What is Prefix.pch file in Xcode?
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Precompiled header.
What is it?
A Prefix.pch is a precompiled header. Precompiled headers were invented to make compiling faster. Rather than parsing the same header files over and over, these files get parsed once, ahead of tim...
Right way to initialize an OrderedDict using its constructor such that it retains order of initial d
...emoved before the OrderedDict constructor sees it.
Note that using a list comprehension in your last example doesn't change anything. There's no difference between OrderedDict([(i,i) for i in l]) and OrderedDict([('b', 'b'), ('a', 'a'), ('c', 'c'), ('aa', 'aa')]). The list comprehension is evalua...
How do I view events fired on an element in Chrome DevTools?
... Chrome will skip it and go straight to your source code. developer.chrome.com/devtools/docs/blackboxing
– Matt Zeunert
Feb 12 '16 at 21:22
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Git merge errors
...# Switch to the topic branch:
git checkout 9-sign-in-out
# Create a merge commit, which looks as if it's merging in from master, but is
# actually discarding everything from the master branch and keeping everything
# from 9-sign-in-out:
git merge -s ours master
# Switch back to the master branch:
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How can I use grep to show just filenames on Linux?
... @Hauke And my answer was -l. I mentioned -H only because the user's command in the question included -H and it is redundant when -l is given.
– Random832
Apr 26 '18 at 15:58
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How do I convert a Ruby class name to a underscore-delimited symbol?
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Rails comes with a method called underscore that will allow you to transform CamelCased strings into underscore_separated strings. So you might be able to do this:
FooBar.name.underscore.to_sym
But you will have to install Activ...
Increment a database field by 1
... of say logins, how would I go about updating that field by 1 within a sql command?
5 Answers
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Select distinct values from a table field
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