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Is it possible to decrypt MD5 hashes?
...without trying out 2128 possible input strings. And the fact that most passwords are short, and people often use common values (like "password" or "secret") means that in some cases, you can make a reasonably good guess at someone's password by Googling for the hash or using a Rainbow table. That is...
Generate a random point within a circle (uniformly)
...ows that the number of random points should grow linearly with r. In other words, the desired probability density function (PDF) grows linearly. Since a PDF should have an area equal to 1 and the maximum radius is 1, we have
So we know how the desired density of o...
Passing arrays as parameters in bash
... you wrote this answer, and that you accepted the bad answer. That's why I worded it that way. The reason the accepted answer is bad is because it is trying to pass array by reference, which is something you should really avoid. In addition, the example mashes multiple arguments into a single string...
Can you explain the concept of streams?
...
The word "stream" has been chosen because it represents (in real life) a very similar meaning to what we want to convey when we use it.
Let's forget about the backing store for a little, and start thinking about the analogy to a...
Android ImageView Zoom-in and Zoom-Out
...dth is smaller than the views width
//in other words if the image width fits in the view
//limit left and right movement
if (scaleWidth < width)
{
deltaX...
What is NoSQL, how does it work, and what benefits does it provide? [closed]
...y is it?
On one hand, a specific system, but it has also become a generic word for a variety of new data storage backends that do not follow the relational DB model.
How does it work?
Each of the systems labelled with the generic name works differently, but the basic idea is to offer better scalab...
Emacs mode for Stack Overflow's markdown
...upport for reading a subset of org-mode and can output markdown.
In other words, you can keep writing in org-mode, including writing italics /like this/, and then export to markdown.
From emacs you can convert to markdown by selecting the region, hitting C-u M-S-\ and typing pandoc -r org -t markdo...
Unknown file type MIME?
...ave to specify a MIME type if the uploaded file has no extension?
In other words is there a default general MIME type?
3 An...
How to prove that a problem is NP complete?
...
To show a problem is NP complete, you need to:
Show it is in NP
In other words, given some information C, you can create a polynomial time algorithm V that will verify for every possible input X whether X is in your domain or not.
Example
Prove that the problem of vertex covers (that is, for some ...
Is Ruby pass by reference or by value?
...ually not pass-by-value or pass-by-reference in the strict CS sense of the words. What he was missing is that the "values" you're passing are references. I felt that just saying "It's pass-by-value" would be pedantic and do the OP a disservice, as that isn't actually what he meant. But thanks for th...