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How do I check if there are duplicates in a flat list?
For example, given the list ['one', 'two', 'one'] , the algorithm should return True , whereas given ['one', 'two', 'three'] it should return False .
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pull/push from multiple remote locations
...rge into HEAD, do:
git remote update
If it's not currently connected to one of the remotes, it will take time out or throw an error, and go on to the next. You'll have to manually merge from the fetched repositories, or cherry-pick, depending on how you want to organize collecting changes.
To fe...
What is an index in SQL?
...es are not unique. I might have a user database and want to query for everyone that lives in Gothenburg. An index on the "city" field would speed up my query. But there are more than 1 user living in Gothenburg so the index must be non-unique.
– Emil Vikström
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Library not loaded: /usr/local/opt/readline/lib/libreadline.6.2.dylib
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This one did it for me on El Capitan
– Sebastian Sastre
Oct 20 '16 at 13:18
6
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Equivalent of “throw” in R
How does one "throw" an error in R? I have a function that takes a data frame and some column names and does stuff with them. If the columns don't exist, I want the function to stop and to stop all functions depending on it.
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Why does C++ compilation take so long?
...reds or even thousands of headers to be (1) loaded and (2) compiled.
Every one of them typically has to be recompiled for every compilation unit,
because the preprocessor ensures that the result of compiling a header might vary between every compilation unit.
(A macro may be defined in one compilati...
Is there an online name demangler for C++? [closed]
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This one worked for me, but not the one in the more popular answer: _ZN9cdnalizer11rewriteHTMLINS_6apache8IteratorEcEET_RKSsRKNS_6ConfigES3_S3_St8functionIFS3_RKS3_SB_EES9_IFvSsEE
– matiu
Dec...
Changing the background drawable of the searchview widget
...decides to reimplement internals of SearchView and element with above-mentioned id is not present - the code won't work.
In SDK, the background for text field in SearchView is declared through nine-patches, so we'll do it the same way. You can find original png images in drawable-mdpi directory of ...
Drop all the tables, stored procedures, triggers, constraints and all the dependencies in one sql st
...eting stored procedures, triggers, constraints and all the dependencies in one SQL statement?
21 Answers
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Quickly find whether a value is present in a C array?
...roll the loop. Here's a way to do it which incorporates the 3 ideas I mentioned in my comment: Loop unrolling, cache prefetch and making use of the multiple load (ldm) instruction. The instruction cycle count comes out to about 3 clocks per array element, but this doesn't take into account memory de...