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How does the HyperLogLog algorithm work?
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The problem is that the assumption of having evenly distributed numbers from 0 t 2^k-1 is too hard to achieve (the data we encountered is mostly not numbers, almost never evenly distributed, and can be between any values. But using a good hashing function you can assume that the output bits would...
GitHub - failed to connect to github 443 windows/ Failed to connect to gitHub - No Error
...date the Git Config for proxy setting
Damn, can not see proxy information from control panel. IT guys must have hidden it. I can not even change the setting to not to use proxy.
Found this wonderful tutorial of finding which proxy your are connected to
Updated the http.proxy key in git config by fo...
Can Java 8 code be compiled to run on Java 7 JVM?
...tion is being done using invokeDynamic (which already exist in JDK 7). So, from the JVM instruction set standpoint, nothing should make the codebase incompatible. There are, though, a lot of API associated and compiler improvements that would could make the code from JDK 8 difficult to compile/run u...
Converting an int to std::string
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boost::lexical_cast<std::string>(yourint) from boost/lexical_cast.hpp
Work's for everything with std::ostream support, but is not as fast as, for example, itoa
It even appears to be faster than stringstream or scanf:
http://www.boost.org/doc/libs/1_53_0/doc/htm...
Where to use EJB 3.1 and CDI?
...bean. The @Stateless is basically an instance pool -- you get an instance from the pool for the duration of one invocation. The @Singleton is essentially @ApplicationScoped
So in a fundamental level, anything you can do with an "EJB" bean you should be able to do with a "CDI" bean. Under the cov...
What does !! mean in ruby?
... thing that is it used for legitimately is preventing a huge chunk of data from being returned. For example you probably don't want to return 3MB of image data in your has_image? method, or you may not want to return your entire user object in the logged_in? method. Using !! converts these objects...
Parsing HTML into NSAttributedText - how to set font?
... on the answer given by Javier Querol
extension UILabel {
func setHTMLFromString(text: String) {
let modifiedFont = NSString(format:"<span style=\"font-family: \(self.font!.fontName); font-size: \(self.font!.pointSize)\">%@</span>", text) as String
let attrStr = try...
How to sort Map values by key in Java?
...shSet. Roughly speaking operations that find or insert an element will go from O(1) to O(Log(N)).
In a HashMap, moving from 1000 items to 10,000 doesn't really affect your time to lookup an element, but for a TreeMap the lookup time will be about 3 times slower (assuming Log2). Moving from 1000 t...
onConfigurationChanged not getting called
...your activity, even when running on an Android 3.2 or
higher device).
(From http://developer.android.com/guide/topics/resources/runtime-changes.html)
TL;DR: add "|screenSize" to configChanges when targeting API level 13+
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Flatten list of lists [duplicate]
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Using itertools.chain.from_iterable is much simpler.
– Platinum Azure
Jun 29 '12 at 15:41
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