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Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
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10
Active
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Expand a random range from 1–5 to 1–7
...2, 3 },
{ 4, 5, 6, 7, 1 },
{ 2, 3, 4, 5, 6 },
{ 7, 0, 0, 0, 0 }
};
int result = 0;
while (result == 0)
{
int i = rand5();
int j = rand5();
result = vals[i-1][j-1];
}
return result;
}
How does it work? Think of it like this: i...
Knight's Shortest Path on Chessboard
...ves are connected (value=1), and unavailable moves are disconnected (value=0), the sparse matrix would be like:
(a1,b3)=1,
(a1,c2)=1,
.....
And the shortest path of two points in a graph can be found using http://en.wikipedia.org/wiki/Dijkstra's_algorithm
Pseudo-code from wikipedia-page:
func...
Display numbers with ordinal suffix in PHP
...= array('th','st','nd','rd','th','th','th','th','th','th');
if (($number %100) >= 11 && ($number%100) <= 13)
$abbreviation = $number. 'th';
else
$abbreviation = $number. $ends[$number % 10];
Where $number is the number you want to write. Works with any natural number.
As a fun...
Why does this assert throw a format exception when comparing structures?
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100
I've got it. And yes, it's a bug.
The problem is that there are two levels of string.Format go...
How To: Best way to draw table in console app (C#)
...ring text, int width)
{
text = text.Length > width ? text.Substring(0, width - 3) + "..." : text;
if (string.IsNullOrEmpty(text))
{
return new string(' ', width);
}
else
{
return text.PadRight(width - (width - text.Length) / 2).PadLeft(width);
}
}
...
How to debug Lock wait timeout exceeded on MySQL?
...***
Type: InnoDB
Name:
Status:
=====================================
110514 19:44:14 INNODB MONITOR OUTPUT
=====================================
Per second averages calculated from the last 4 seconds
----------
SEMAPHORES
----------
OS WAIT ARRAY INFO: reservation count 9014315, signal count 780...
Python 3.x rounding behavior
I was just re-reading What’s New In Python 3.0 and it states:
11 Answers
11
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What to do about Eclipse's “No repository found containing: …” error messages?
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450
Quick answer
Go to Help → Install new software → Here uncheck “Contact all update sites d...
What is “2's Complement”?
...e to think of the numbers in binary.
It basically says,
for zero, use all 0's.
for positive integers, start counting up, with a maximum of 2(number of bits - 1)-1.
for negative integers, do exactly the same thing, but switch the role of 0's and 1's (so instead of starting with 0000, start with 1111...