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Why does Dijkstra's algorithm use decrease-key?
Dijkstra's algorithm was taught to me was as follows
3 Answers
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Designing function f(f(n)) == -n
...In other languages the largest positive integer will overflow, so it will work for all integers except that one.
To make it work for real numbers you need to replace the n in (-1)n with { ceiling(n) if n>0; floor(n) if n<0 }.
In C# (works for any double, except in overflow situations):
st...
JavaScript/regex: Remove text between parentheses
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Doesn't work if you have something like: It's a bit messed (up (right)) but it happens :)
– TigrouMeow
Mar 2 at 2:15
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How to make an Android device vibrate?
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Try:
import android.os.Vibrator;
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Vibrator v = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE);
// Vibrate for 500 milliseconds
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
v.vibrate(VibrationEffect.createOne...
Unable to load DLL 'SQLite.Interop.dll'
...sing had Sqlite as a dependency (configured in NuGet with only the Sqlite core package.). The project compiles and copies all the Sqlite dll-s except the 'SQLite.Interop.dll' (both x86 and x64 folder).
The solution was very simple: just add the Sqlite.Core package as a dependency (with NuGet) to th...
Python - write() versus writelines() and concatenated strings
...line1 + "\n" + line2 merges those strings together into a single string before passing it to write.
Note that if you have many lines, you may want to use "\n".join(list_of_lines).
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What is a None value?
...ying Python, and I read a chapter which describes the None value, but unfortunately this book isn't very clear at some points. I thought that I would find the answer to my question, if I share it there.
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How to add Options Menu to Fragment in Android
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Put log statements in the code to see if the method is not being called or if the menu is not being amended by your code.
Also ensure you are calling setHasOptionsMenu(boolean) in onCreate(Bundle) to notify the fragment that it should participate in options menu handling.
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entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding relat
... my contact, which is validated I get the exception "ADO.Net Entity Framework An entity object cannot be referenced by multiple instances of IEntityChangeTracker"
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What does -XX:MaxPermSize do?
Specifically, why would it help to fix a PermGen OutOfMemoryError issue?
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