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Negative weights using Dijkstra's Algorithm
...ights but without negative cycles.
However, in this case, the asymptotic time bound of dijkstra for graphs without negative cycles is lost. This is because a previously settled node can be reinserted into the heap when a better distance is found due to negative weights. This property is called lab...
Running Python code in Vim
I am writing Python code using Vim, and every time I want to run my code, I type this inside Vim:
20 Answers
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How do you count the lines of code in a Visual Studio solution?
...
(The only time I've ever been asked to supply line counts was when upper management was figuring out how much time it would take to migrate all our products overseas so they could shut down our domestic site.)
– G...
Regex to replace multiple spaces with a single space
...le the first is replacing any space with a space as well. Whether this is time saved during the search or the actual replace, I don't know.
– Maloric
Aug 16 '16 at 11:27
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Can a decorator of an instance method access the class?
...s in a very simple way. The doc states that __set_name__ is "called at the time the owning class owner is created".
Here is an example:
class class_decorator:
def __init__(self, fn):
self.fn = fn
def __set_name__(self, owner, name):
# do something with owner, i.e.
p...
Select random lines from a file
...accepted...
EDIT: I beat my own record
powershuf did it in 0.047 seconds
$ time ./powershuf.py -n 10 --file lines_78000000000.txt > /dev/null
./powershuf.py -n 10 --file lines_78000000000.txt > /dev/null 0.02s user 0.01s system 80% cpu 0.047 total
The reason it is so fast, well I don't rea...
Declaring variables inside loops, good practice or bad practice?
...value between each loop. In such case, you may need to initialize it every time. You can also create a larger block, encompassing the loop, whose sole purpose is to declare variables which must retain their value from one loop to another. This typically includes the loop counter itself.
{
int i...
What is the best way to stop people hacking the PHP-based highscore table of a Flash game
...ing your source code, whether you know it or not.
Attackers control the runtime memory of the Flash interpreter, so that anyone who knows how to use a programmable debugger can alter any variable (including the current score) at any time, or alter the program itself.
The simplest possible attack a...
How to log a method's execution time exactly in milliseconds?
Is there a way to determine how much time a method needs to execute (in milliseconds)?
20 Answers
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Find nearest value in numpy array
...rray then the bisection code (given below) performs the fastest. ~100-1000 times faster for large arrays, and ~2-100 times faster for small arrays. It does not require numpy either.
If you have an unsorted array then if array is large, one should consider first using an O(n logn) sort and then bise...