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When should I use the HashSet type?
I am exploring the HashSet<T> type, but I don't understand where it stands in collections.
11 Answers
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Import SQL dump into PostgreSQL database
We are switching hosts and the old one provided a SQL dump of the PostgreSQL database of our site.
15 Answers
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What's with 181783497276652981 and 8682522807148012 in Random (Java 7)?
...ubsequent initializations.
So the current java docs:
This constructor sets the seed of the random number generator to a
value very likely to be distinct from any other invocation of this
constructor.
could be extended by "across threads" and "uncorrelated"
Seed Sequence Quality
But the ...
Using fonts with Rails asset pipeline
...t; 3.1.0 and < 4, place your fonts in any of the these folders:
app/assets/fonts
lib/assets/fonts
vendor/assets/fonts
For Rails versions > 4, you must place your fonts in the app/assets/fonts folder.
Note: To place fonts outside of these designated folders, use the following configurat...
How to generate a core dump in Linux on a segmentation fault?
...re using. If you are using bash, then the ulimit command controls several settings relating to program execution, such as whether you should dump core. If you type
ulimit -c unlimited
then that will tell bash that its programs can dump cores of any size. You can specify a size such as 52M inst...
How to test android referral tracking?
...
Intent i = new Intent("com.android.vending.INSTALL_REFERRER");
//Set Package name
i.setPackage("com.package.yourapp");
//referrer is a composition of the parameter of the campaing
i.putExtra("referrer", referrer);
sendBroadcast(i);
...
How do I get the day of the week with Foundation?
...Formatter = [[[NSDateFormatter alloc] init] autorelease];
[dateFormatter setDateFormat:@"EEEE"];
NSLog(@"%@", [dateFormatter stringFromDate:[NSDate date]]);
outputs current day of week as a string in locale dependent on current regional settings.
To get just a week day number you must use NSCal...
How to navigate through a vector using iterators? (C++)
... editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled) {
StackExchange.using("snippets", function() {
createEditor();
});
}
else {
createEditor();
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How to perform .Max() on a property of all objects in a collection and return the object with maximu
... suggest writing your own MaxObject extension manually if you have a large set of items to be able to do it in one pass without sorting and other stuff whatsoever (O(n)):
static class EnumerableExtensions {
public static T MaxObject<T,U>(this IEnumerable<T> source, Func<T,U> s...
Finding all possible permutations of a given string in python
...plicates, try fitting your data into a structure with no duplicates like a set:
>>> perms = [''.join(p) for p in permutations('stacks')]
>>> len(perms)
720
>>> len(set(perms))
360
Thanks to @pst for pointing out that this is not what we'd traditionally think of as a typ...