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What is an NP-complete in computer science?
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What is NP?
NP is the set of all decision problems (questions with a yes-or-no answer) for which the 'yes'-answers can be verified in polynomial time (O(nk) where n is the problem size, and k is a constant) by a deterministic Turing machine. Polyn...
How to crop an image in OpenCV using Python
How can I crop images, like I've done before in PIL, using OpenCV.
8 Answers
8
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Exposing a port on a live Docker container
I'm trying to create a Docker container that acts like a full-on virtual machine. I know I can use the EXPOSE instruction inside a Dockerfile to expose a port, and I can use the -p flag with docker run to assign ports, but once a container is actually running, is there a command to open/map addi...
How do I preserve line breaks when using jsoup to convert html to plain text?
I have the following code:
15 Answers
15
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Git merge reports “Already up-to-date” though there is a difference
...swer, one solution to remediate the problem is:
git checkout master
git reset --hard test
This brings it back to the 'test' level.
Then do:
git push --force origin master
in order to force changes back to the central repo.
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How are virtual functions and vtable implemented?
We all know what virtual functions are in C++, but how are they implemented at a deep level?
12 Answers
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JavaScript: Passing parameters to a callback function
I'm trying to pass some parameter to a function used as callback, how can I do that?
13 Answers
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android start activity from service
... Intent intent = new Intent(storedActivity, MyActivity.class);
intent.setAction(Intent.ACTION_VIEW);
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
intent.setFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);
storedActivity.startActivity(intent);
I do not know whether ACTION_VIEW or F...
Programmatically change log level in Log4j2
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EDITED according to log4j2 version 2.4 FAQ
You can set a logger’s level with the class Configurator from Log4j Core. BUT be aware that the Configurator class is not part of the public API.
// org.apache.logging.log4j.core.config.Configurator;
Configurator.setLevel("com.exa...
How do I debug an MPI program?
I have an MPI program which compiles and runs, but I would like to step through it to make sure nothing bizarre is happening. Ideally, I would like a simple way to attach GDB to any particular process, but I'm not really sure whether that's possible or how to do it. An alternative would be having ea...