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Algorithm for creating a school timetable
I've been wondering if there are known solutions for algorithm of creating a school timetable. Basically, it's about optimizing "hour-dispersion" (both in teachers and classes case) for given class-subject-teacher associations. We can assume that we have sets of classes, lesson subjects and teacher...
What does it mean for a data structure to be “intrusive”?
...sive data structure would be an ordered list of elements that are mutable. If the element changes, the list needs to be reordered, so the list object has to intrude on the privacy of the elements in order to get their cooperation. ie. the element has to know about the list it is in, and inform it of...
How do PHP sessions work? (not “how are they used?”)
...ow Does PHP Session Works
Firstly PHP creates a 16-byte long unique identifier number (stored as a string of 32 hexadecimal characters, e.g a86b10aeb5cd56434f8691799b1d9360) for an individual session.
PHPSESSID cookie passes that unique identification number to users' browser to save that number.
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cleanest way to skip a foreach if array is empty [duplicate]
Not a major problem but I was wondering if there is a cleaner way to do this. It would be good to avoid nesting my code with an unnecessary if statement. If $items is empty php throws an error.
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Python Regex - How to Get Positions and Values of Matches
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@StevenWernerCS start() may accept a group number, so if you want an index of nth group, use start(n)
– Hi-Angel
Jun 6 at 21:55
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Get item in the list in Scala?
... do that with lists very often, since linked lists take time to traverse. If you want to index into a collection, use Vector (immutable) or ArrayBuffer (mutable) or possibly Array (which is just a Java array, except again you index into it with (i) instead of [i]).
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How do you set the Content-Type header for an HttpClient request?
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Just so folks know, using MediaTypeHeaderValue will return an error if attempting to set the charset, like so; response.Content.Headers.ContentType = new MediaTypeHeaderValue("text/xml; charset=utf-8");
– MBak
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window.location.href and window.open () methods in JavaScript
What is the difference between window.location.href and window.open () methods in JavaScript?
6 Answers
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Define global variable in a JavaScript function
...ou literally have no evidence that the window object actually exists. You know nothing about how your code will be used in the future. It might be even used in the MongoDB environment or rino instead of your node. And the window object is also not visible even in the browser if you use web workers ...
How to fix: android.app.RemoteServiceException: Bad notification posted from package *: Couldn't cre
...ferences changed. The integer that used to reference the correct drawable now referenced either the incorrect drawable or none at all (none at all - causing this crash)
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