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Fast permutation -> number -> permutation mapping algorithms
...d k the index of the digit. (I will always count digits from the right and starting at index 0 for the rightmost digit. Likewise when I talk about the 'first' digit I mean the rightmost.)
The reason why the weights for digits follow this pattern is that the highest number that can be represented by...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
...p;title=$2 [NC,L,QSA]
The rule is split into 4 sections:
RewriteRule - starts the rewrite rule
^blog/([0-9]+)/([A-Za-z0-9-\+]+)/?$ - This is called the pattern, however I'll just refer to it as the left hand side of the rule - what you want to rewrite from
blog/index.php?id=$1&title=$2 - cal...
Cron job every three days
...d 31 days.) The date('j') % 3 has a similar problem in that the pattern restarts every year, and years don't have a number of days divisible by 3.
– cjm
Apr 19 '15 at 22:28
8
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Git commit with no commit message
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@amn, I also just started wondering about all those tens of thousands of well-written commit messages that I have written that will never ever be read by anyone. For me now the value of this habit is that it forces me to look through the chang...
How do I speed up the gwt compiler?
We're starting to make heavier use of GWT in our projects, and the performance of the GWT compiler is becoming increasingly annoying.
...
Show current state of Jenkins build on GitHub repo
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Sadly, it seems that GitHub started caching these images on some image hosting service, and they are being displayed incorrectly now.
– axel22
Feb 12 '14 at 8:59
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SQL Query to concatenate column values from multiple rows in Oracle
...a a, table_b b
WHERE a.pid = b.pid(+)
)
)
START WITH rnum = 1
CONNECT BY PRIOR rnum = rnum - 1 AND PRIOR pid = pid
GROUP BY pid
ORDER BY pid;
There may also be instances where keys and values are all contained in one table. The following query can be used where the...
Why does Google +1 record my mouse movements? [closed]
....width * screen.width + screen.height) * 1000000, and c is a variable that starts out as 1.
All of this is wrapped in the scope of an anonymous function, which itself is immediately evaluated to return a function that is assigned to a property named "random". That returned function looks something ...
Convert objective-c typedef to its string equivalent
...In a header file
typedef enum {
JSON = 0, // explicitly indicate starting index
XML,
Atom,
RSS,
FormatTypeCount, // keep track of the enum size automatically
} FormatType;
extern NSString *const FormatTypeName[FormatTypeCount];
// In a source file
NSString *const FormatTypeName...
How to create the most compact mapping n → isprime(n) up to a limit N?
...every odd number with one bit e.g. for the given range of numbers (1, 10], starts at 3: 1110
31 Answers
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