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Best algorithm for detecting cycles in a directed graph [closed]
...(all reachable nodes are visited along with the current one) color coding, if a grey node finds another grey node then we've a cycle. [Pretty much what we've in Cormen's algorithm book]. Wondering if 'Tarjan's algorithm' has any benefit over such DFS!!
– KGhatak
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What's the difference between dist-packages and site-packages?
I'm a bit miffed by the python package installation process. Specifically, what's the difference between packages installed in the dist-packages directory and the site-packages directory?
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What should I set JAVA_HOME environment variable on macOS X 10.6?
...ing lines to ~/.bash_profile.
export JAVA_HOME=$(/usr/libexec/java_home)
Now run the following command.
source ~/.bash_profile
You can check the exact value of JAVA_HOME by typing the following command.
echo $JAVA_HOME
The value(output) returned will be something like below.
/Library/Java/...
How does one remove an image in Docker?
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Ah, i didn't know about the command for "remove all existing container". Had written own: docker ps -a | sed -r 's/^(\w+).*/\1/g' | sed -r 's/^CONTAINER//' | sed -r 's/^(\w+)/docker rm \1/g' | awk 'system($0)' Thanks !
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How to check if a process id (PID) exists
...s -p $PID > /dev/null
then
echo "$PID is running"
# Do something knowing the pid exists, i.e. the process with $PID is running
fi
The problem with:
kill -0 $PID
is the exit code will be non-zero even if the pid is running and you dont have permission to kill it. For example:
kill -0 1...
Go Error Handling Techniques [closed]
...red IMHO. However complaining is forbidden, so I'll just drink my kool-aid now ;-)
– Thomas
Jan 1 '14 at 5:28
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show 2 more comments
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How to sort my paws?
...ellent answer that helped me detect where a paw hit a pressure plate, but now I'm struggling to link these results to their corresponding paws:
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Change the Target Framework for all my projects in a Visual Studio Solution
...ckup settings (will create a backup by default)
Start Replacing (Ctrl+R)
Now If for some reason you need to do this in code, I would probably be able to do that as well (it's how I found this question). In that case, please request it in a comment.
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How to convert an enum type variable to a string?
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There really is no beautiful way of doing this. Just set up an array of strings indexed by the enum.
If you do a lot of output, you can define an operator<< that takes an enum parameter and does the lookup for you.
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What is the volatile keyword useful for?
...ome code continues a loop. The loop tests the volatile value and continues if it is true. The condition can be set to false by calling a "stop" method. The loop sees false and terminates when it tests the value after the stop method completes execution.
The book "Java Concurrency in Practice," whic...