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How to detect a loop in a linked list?
...erences to the list and move them at different speeds. Move one forward by 1 node and the other by 2 nodes.
If the linked list has a loop they
will definitely meet.
Else either of
the two references(or their next)
will become null.
Java function implementing the algorithm:
boolean hasLoop(Node...
What's the simplest way to subtract a month from a date in Python?
...
Try this:
def monthdelta(date, delta):
m, y = (date.month+delta) % 12, date.year + ((date.month)+delta-1) // 12
if not m: m = 12
d = min(date.day, [31,
29 if y%4==0 and (not y%100==0 or y%400 == 0) else 28,
31,30,31,30,31,31,30,31,30,31][m-1])
return date.replace(...
What does value & 0xff do in Java?
...
173
It sets result to the (unsigned) value resulting from putting the 8 bits of value in the lowes...
Returning value from called function in a shell script
...also true for some other shells.
Here's how to do each of those options:
1. Echo strings
lockdir="somedir"
testlock(){
retval=""
if mkdir "$lockdir"
then # Directory did not exist, but it was created successfully
echo >&2 "successfully acquired lock: $lockdir"
...
Guid is all 0's (zeros)?
...
answered Nov 1 '11 at 20:00
Mark ByersMark Byers
683k155155 gold badges14681468 silver badges13881388 bronze badges
...
Equation (expression) parser with precedence?
...ce you need to think recursively, for example, using your sample string,
1+11*5
to do this manually, you would have to read the 1, then see the plus and start a whole new recursive parse "session" starting with 11... and make sure to parse the 11 * 5 into its own factor, yielding a parse tree wi...
List files by last edited date
...
172
You can use:
ls -Rt
where -R means recursive (include subdirectories) and -t means "sort by...
How do I prompt for Yes/No/Cancel input in a Linux shell script?
...
31 Answers
31
Active
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Seedable JavaScript random number generator
...e JavaScript Math.random() function returns a random value between 0 and 1, automatically seeded based on the current time (similar to Java I believe). However, I don't think there's any way to set you own seed for it.
...
Algorithm to generate all possible permutations of a list?
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