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Fast permutation -> number -> permutation mapping algorithms
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The complexity can be brought down to n*log(n), see section 10.1.1
("The Lehmer code (inversion table)", p.232ff) of the fxtbook:
http://www.jjj.de/fxt/#fxtbook
skip to section 10.1.1.1 ("Computation with large arrays" p.235) for the fast method.
The (G...
Redirect non-www to www in .htaccess
...*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]
If you need to support http and https and preserve the protocol choice try the following:
RewriteRule ^login\$ https://www.%{HTTP_HOST}/login [R=301,L]
Where you replace login with checkout.php or whatever URL you need to support HTTPS on.
I'd argue thi...
Is a Java string really immutable?
...ince they had to get evaluated for every string operation it meant slowing down every string operation just for the benefit of just one operation, a cheap substring.
– Holger
Jan 6 '14 at 19:32
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Comma in C/C++ macro
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Not sure why this is so far down, it's a much nicer solution than Mike Seymours. It's quick and simple and completely hidden from the user.
– iFreilicht
Apr 16 '16 at 0:07
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XPath contains(text(),'some string') doesn't work when used with node with more than one Text subnod
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Your xpath expression was
//*[contains(text(),'ABC')]
To break this down,
* is a selector that matches any element (i.e. tag) -- it returns a node-set.
The [] are a conditional that operates on each individual node in that node set. It matches if any of the individual nodes it operates on ...
Sharing a URL with a query string on Twitter
...le About it
http://twitter.com/share?text=Im Sharing on Twitter&url=https://stackoverflow.com/users/2943186/youssef-subehi&hashtags=stackoverflow,example,youssefusf
share
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improve this a...
What's the difference between deque and list STL containers?
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Let me list down the differences:
Deque manages its elements with a
dynamic array, provides random
access, and has almost the same
interface as a vector.
List manages its elements as a
doubly linked list and does not
provide random acc...
Is a Java hashmap search really O(1)?
...^100) is still O(n). I get your point about efficiency bringing then ratio down but that still puts the algorithm at O(n).
– paxdiablo
Jun 28 '09 at 16:59
5
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.NET - Dictionary locking vs. ConcurrentDictionary
... I read this article, even though it's all true, that somehow we are going down the wrong path.
– scope_creep
Sep 8 '10 at 21:43
19
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How does data binding work in AngularJS?
...ive of the machine though this is wildly inefficient and will slow our app down if we create too many watchers. Misko has quoted a figure of about 4000 watchers before your app will feel slow on older browsers.
This limit is easy to reach if you ng-repeat over a large JSON array for example. You can...