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Can hash tables really be O(1)?
...f your objects are variable size and an equality check requires looking at all bits then performance will become O(m). The hash function however does not have to be O(m) - it can be O(1). Unlike a cryptographic hash, a hash function for use in a dictionary does not have to look at every bit in the i...
What is a postback?
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When does it happen?
A postback originates from the client browser. Usually one of the controls on the page will be manipulated by the user (a button clicked or dropdown changed, etc), and this control will initiate a postback. The state of this control, plus all other controls on the page,(know...
How to configure robots.txt to allow everything?
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That file will allow all crawlers access
User-agent: *
Allow: /
This basically allows all user agents (the *) to all parts of the site (the /).
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Initialization of all elements of an array to one default value in C++?
...[100] = {-1};
says "set the first element to -1 and the rest to 0" since all omitted elements are set to 0.
In C++, to set them all to -1, you can use something like std::fill_n (from <algorithm>):
std::fill_n(array, 100, -1);
In portable C, you have to roll your own loop. There are comp...
Save all files in Visual Studio project as UTF-8
I wonder if it's possible to save all files in a Visual Studio 2008 project into a specific character encoding. I got a solution with mixed encodings and I want to make them all the same (UTF-8 with signature).
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How to add onload event to a div element
..., you can't. The easiest way to make it work would be to put the function call directly after the element
Example:
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<div id="somid">Some content</div>
<script type="text/javascript">
oQuickReply.swap('somid');
</script>
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or - even better - just in front of </...
What is the purpose of flush() in Java streams?
...Java, flush() method is used in streams. But I don't understand what are all the purpose of using this method?
6 Answers
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What is normalized UTF-8 all about?
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Compatibility Normalization
Unicode also includes many characters that really do not belong, but were used in legacy character sets. Unicode added these to allow text in those character sets to be processed as Unicode, and then be converted back without loss.
Compatibility normalization converts t...
How to see all TODO tasks in Android Studio?
How could I open a view in Android Studio where all tasks that I've created using // TODO comments would be displayed?
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Get OS-level system information
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You can get some limited memory information from the Runtime class. It really isn't exactly what you are looking for, but I thought I would provide it for the sake of completeness. Here is a small example. Edit: You can also get disk usage information from the java.io.File class. The disk space us...