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How to prove that a problem is NP complete?
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In order to prove that a problem L is NP-complete, we need to do the following steps:
Prove your problem L belongs to NP (that is that given a solution you can verify it in polynomial time)
Select a known NP-complete problem ...
What are the minimum margins most printers can handle?
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@GabrielStaples: On Linux you can find the files in /etc/cups/ppd. In the PPD spec the dimensions are described as lower left and upper right "ll.x ll.y ur.x ur.y".
– Derek Veit
Jul 25 '18 at 14:40
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Why is list initialization (using curly braces) better than the alternatives?
... in the constructor (e.g. containers, POD structs, atomics, smart pointers etc.), then I'm using the braces.
If the constructor resembles a normal function call (it performs some more or less complex operations that are parametrized by the arguments) then I'm using the normal function call syntax.
F...
In absence of preprocessor macros, is there a way to define practical scheme specific flags at proje
...'t want to have to set them and keep them up to date for different targets etc. Also, in our mixed codebase, we didn't want to make remember to set our flags appropriately all the time for each language.
For ours, we declared a file in ObjC
PreProcessorMacros.h
extern BOOL const DEBUG_BUILD;
I...
if a ngSrc path resolves to a 404, is there a way to fallback to a default?
...or occurs (which will be because the image doesn't exist or is unreachable etc) we capture and react. You can attempt to get the image sizes too - if they were present on the image/style in the first place. If not, then set yourself a default.
This example is using placehold.it for an image to show...
Is it possible to roll back CREATE TABLE and ALTER TABLE statements in major SQL databases?
...has transactional DDL for most database objects (certainly tables, indices etc but not databases, users). However practically any DDL will get an ACCESS EXCLUSIVE lock on the target object, making it completely inaccessible until the DDL transaction finishes. Also, not all situations are quite handl...
How to count lines of Java code using IntelliJ IDEA?
...bal search for '\n'. You can filter it any way you like on file extensions etc.
Ctrl-Shift-F -> Text to find = '\n' -> Find.
Edit: And 'regular expression' has to be checked.
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Making 'git log' ignore changes for certain paths
..., all changes to those files will be ignored by git status, git commit -a, etc. When you're ready to commit those files, just reverse it:
git update-index --no-skip-worktree path/to/file
and commit as normal.
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Basic example of using .ajax() with JSONP?
...ve to use script HTMLl tags, the ones you usually use to load JS files, in order for JS to get data from another domain. Sounds weird?
Thing is - turns out script tags can be used in a fashion similar to XMLHttpRequest! Check this out:
script = document.createElement("script");
script.type = "text...
What's the difference between URI.escape and CGI.escape?
... some feed -> which I then need to encode -> Pass to http client to fetch content. Now if I don't encode the external urls properly, the ruby based HTTP clients fail with invalid URI errors.
– amit_saxena
Nov 10 '14 at 15:58
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