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Time complexity of Euclid's Algorithm
...o follow what happens over two iterations:
a', b' := a % b, b % (a % b)
Now a and b will both decrease, instead of only one, which makes the analysis easier. You can divide it into cases:
Tiny A: 2a <= b
Tiny B: 2b <= a
Small A: 2a > b but a < b
Small B: 2b > a but b < a
Equal...
What is SQL injection? [duplicate]
...erabilities because attackers can send values to an application that they know will be interpolated into a SQL string. By being very clever, they can manipulate the result of queries, reading data or even changing data that they shouldn't be allowed to do.
Example in PHP:
$password = $_POST['pass...
How can I get the current stack trace in Java?
...
@MightyE The bug is now reported as closed as fixed in Java 6. Looking at the internals, it looks like it now does (new Exception()).getStackTrace() when the requested stack trace is on the current thread (which will always be the case for Thre...
What is the difference between self-types and trait subclasses?
...and Scala", you'll get many links, including presentations and videos. For now, here is a link to another question.
Now, as to what is the difference between a self type and extending a trait, that is simple. If you say B extends A, then B is an A. When you use self-types, B requires an A. There ar...
Apk location in New Android Studio
...ple who might search for answer to this same question, it is important to know what type of projects you are using in Studio.
Gradle
The default project type when creating new project, and the recommended one in general is Gradle.
For a new project called "Foo", the structure under the main folde...
Redirecting stdout to “nothing” in python
...y large number of modules, each printing something to the standard output. Now as the project has grown in size, there are large no. of print statements printing a lot on the std out which has made the program considerably slower.
...
JUnit: how to avoid “no runnable methods” in test utils classes
...
That kind of irritated me.
So I made BaseTixContainerTest abstract, and now JUnit truly ignores it.
Tests run: 3, Failures: 0, Errors: 0, Skipped: 0
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Eclipse error “ADB server didn't ACK, failed to start daemon”
...sk manager, which has adb.exe process and end (kill) that process
Step 2:
Now, close the eclipse, which is currently running on my computer.
Step 3:
Again, restart eclipse then solved that problem.
For those using OS X
killall adb
For those using Windows
adb kill-server
should do the tric...
When is JavaScript's eval() not evil?
...-looking command". So, when is it OK to use something dangerous? When you know what the danger is, and when you're taking the appropriate precautions.
To the point, let's look at the dangers in the use of eval(). There are probably many small hidden dangers just like everything else, but the two bi...
How does the SQL injection from the “Bobby Tables” XKCD comic work?
...call it Derper) are concatenated with the rest of the query, the result is now actually two queries separated by the statement terminator (semicolon). The second query has been injected into the first. When the code executes this query against the database, it will look like this
INSERT INTO Stud...