The derivative of a function is a cornerstone of mathematics, engineering, physics, biology, chemistry, and a large number of other sciences as well. Today we're going to be calculating something only tangentially related: the arithmetic derivative.
Definition
The arithmetic derivative a(n) or ...
As you can tell from this question and my previous one, I am determined to kill my SSD.
Let's write the shortest code to perform a simplified variant of the DoD 5220.22-M Wipe Method with only two writing passes.
Any programming language accepted, but the use of disk-wiping-oriented libraries i...
The formula $$(n!-1)!=\frac{(n!)!}{n!}=\prod_{k=n+1}^{n!} k$$ gives an infinite family of examples.
I was playing around with hypergeometric probabilities when I wound myself calculating the binomial coefficient $\binom{10}{3}$. I used the definition, and calculating in my head, I simplified to this expression before actually calculating anything
$$
\frac {8\cdot9\cdot10}{2\cdot3} = 120
$$
An...
J, 30 chars
0:`([*[:+/[:%[:q:[:%:[:*:])@.*
Try it online!
Sample input:
0:`([*[:+/[:%[:q:[:%:[:*:])@.* _8
_12
0:`([*[:+/[:%[:q:[:%:[:*:])@.* 0
0
0:`([*[:+/[:%[:q:[:%:[:*:])@.* 8
12
How it works:
0:`([*[:+/[:%[:q:[:%:[:*:])@.* N
XX`[email protected] if Z then Y else X end
0: ...
When the program you write for a challenge writes/outputs to multiple of the default outputs, are you, the answerer allowed to state which one is counted for the purposes for the challenge?
For example, if my program
Leaves the output on the stack
Outputs to STDOUT
Am I allowed to say that t...
Here's our to-do list for the project:
Close all existing code-trolling questions (or maybe re-tag those three I mentioned).
status-declined - if locked or deleted, closing might not matter, so we may or may not close them all first
Lock all the more popular ones (>20 answers or >20 upvotes, ...
