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Fast permutation -> number -> permutation mapping algorithms
...proved by induction.)
The number we get from converting our sequence will then be the sum of s[k] * w[k], with k running from 0 to n-1. Here s[k] is the k'th (rightmost, starting at 0) element of the sequence. As an example, take our {1, 2, 0, 1, 0}, with the rightmost element stripped off as menti...
Data binding to SelectedItem in a WPF Treeview
...ect> e)
{
this.SelectedItem = e.NewValue;
}
}
You can then use this in your XAML as:
<TreeView>
<e:Interaction.Behaviors>
<behaviours:BindableSelectedItemBehavior SelectedItem="{Binding SelectedItem, Mode=TwoWay}" />
</e:Interaction.Behavior...
What is object slicing?
... int bar;
};
So an object of type B has two data members, foo and bar.
Then if you were to write this:
B b;
A a = b;
Then the information in b about member bar is lost in a.
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How can I ensure that a division of integers is always rounded up?
...minval and divisor is -1
if there is no remainder -- division is 'even' -- then the return value is the integral quotient
Otherwise it returns the smallest integer that is greater than the quotient, that is, it always rounds up.
Now we have a specification, so we know we can come up with a testabl...
LaTeX Optional Arguments
...ahead to detect what characters are coming up next in the token stream and then inserts the relevant macros to process the argument(s) coming up as appropriate. This can be quite tedious (although not difficult) using generic TeX programming. LaTeX's \@ifnextchar is quite useful for such things.
Th...
How to check the extension of a filename in a bash script?
...ht side of == is a shell pattern.
If you need a regular expression, use =~ then.
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Java Can't connect to X11 window server using 'localhost:10.0' as the value of the DISPLAY variable
...
well sometime - it won't work on linux then its good to install Xvfb with apt and run it on any screen like: Xvfb :1 and then set variable in build phase -- export DISPLAY=:1 --> this perfectly works.
– Pankaj Kumar Katiyar
...
Xcode iOS 8 Keyboard types not supported
...S Simulator -> Hardware -> Keyboard -> Connect Hardware Keyboard
then the software keyboard will be displayed once again.
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Insertion Sort vs. Selection Sort
...mplexity is n(n - 1)/2. Generally it will take lesser or equal comparisons then n(n - 1)/2.
Source: http://cheetahonfire.blogspot.com/2009/05/selection-sort-vs-insertion-sort.html
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How do I use Java to read from a file that is actively being written to?
...ant to read a file while it is being written and only read the new content then following will help you achieve the same.
To run this program you will launch it from command prompt/terminal window and pass the file name to read. It will read the file unless you kill the program.
java FileReader c:...