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Computational complexity of Fibonacci Sequence
...rect hypothesis is to say that T(n) <= c*2^n for some fixed c, and then from the conclusion of the inductive proof, you can infer that T(n) = O(2^n)
– amnn
Jul 3 '16 at 10:36
1
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fork() branches more than expected?
...However, what printf() really does is buffer its output. So the first dot from when there were only two processes does not appear when written. Those dots remain in the buffer—which is duplicated at fork(). It is not until the process is about to exit that the buffered dot appears. Four proces...
How to pause / sleep thread or process in Android?
...ynewbutton = mybutton; and use mynewbutton in the Handler and the Runnable from there on.
– Dzhuneyt
May 17 '13 at 13:19
...
How to use regex with find command?
...-regex find expression matches the whole name, including the relative path from the current directory. For find . this always starts with ./, then any directories.
Also, these are emacs regular expressions, which have other escaping rules than the usual egrep regular expressions.
If these are all ...
Why C# implements methods as non-virtual by default?
... like the old "If we give you the power you might hurt yourself" argument. From programmers?!
It seems to me like the coder who didn't know enough (or have enough time) to design their library for inheritance and/or extensibility is the coder who's produced exactly the library I'm likely to have to...
Do I need all three constructors for an Android custom view?
...
If you will add your custom View from xml also like :
<com.mypack.MyView
...
/>
you will need the constructor public MyView(Context context, AttributeSet attrs), otherwise you will get an Exception when Android tries to inflate your Vie...
Is there a JavaScript / jQuery DOM change listener?
...
Here’s a browser compatibility table from Can I Use.
– bdesham
Jul 8 '14 at 14:47
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show 3 more commen...
Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
...ry&.name
NoMethodError: undefined method `name' for "Australia":String
from (pry):38:in `<main>'
> params.try(:country).try(:name)
nil
It is also including a similar sort of way: Array#dig and Hash#dig. So now this
city = params.fetch(:[], :country).try(:[], :state).try(:[], :city)
...
Java: Multiple class declarations in one file
...that pretty much means that you'd never want to refer to a top-level class from another file unless it has the same name as the file it's in.
Suppose you have two files, Foo.java and Bar.java.
Foo.java contains:
public class Foo
Bar.java contains:
public class Bar
class Baz
Let's also say ...
Why are you not able to declare a class as static in Java?
...'t need any instance of anything to refer to them. They can be referred to from anywhere. They're in static storage (as in C storage classes). - As others have noted (Iain Elder in a comment to another answer), the language designers could have allowed the static keyword on a top-level class to deno...