Challenge
Given an integer n (where 4<=n<=10**6) as input create an ASCII art "prison door"* measuring n-1 characters wide and n characters high, using the symbols from the example below.
Example
╔╦╗
╠╬╣
╠╬╣
╚╩╝
The characters used are as follows:
┌───────────────┬─────────┬───────┐
│ Pos...
Introduction:
Since it's almost Halloween, I was just thinking of some random Halloween-themed challenges. Eventually I was reading through Frankenstein's wikipedia page, and came across the following text:
The creature
Part of Frankenstein's rejection of his creation is the fact that h...
Given a, b, c the length of the three sides of a triangle, say if the triangle is right or not.
Input
Three decimal values in any order
Output
Either a true specific output (true, 1, yes, ...) or false specific output (false, 0, no, ...)
Example
5, 3, 4 --> yes
3, 5, 4 --> yes ...
Every positive integer can be expressed as the sum of at most three palindromic positive integers in any base b≥5. Cilleruelo et al., 2017
A positive integer is palindromic in a given base if its representation in that base, without leading zeros, reads the same backwards. In the following...
We have objects that oscillate between two integer points, [l, r], at the speed of one unit per time unit, starting at l on t=0. You may assume l < r. For example, if an object oscillates on [3, 6], then we have:
t=0 -> 3
t=1 -> 4
t=2 -> 5
t=3 -> 6
t=4 -> 5
t=6 -> 4
t=7 -> 3
t=8 -> 4
Etc. But ...
HTML+CSS, 254+nmax*28 bytes
We can check primality using regular expressions. Mozilla has @document, which is defined as:
@document [ <url> | url-prefix(<string>) | domain(<string>) | regexp(<string>) ]# {
<group-rule-body>
}
To filter elements via CSS based on the current URL. This is a si...
Yes
CSS is a programming language. From What is a programming language, which is the authoritative answer, and has a score of 44:
This definition does not require a language to be Turing-complete (although it certainly permits any Turing-complete language). This is intentional. Turing-comple...
I'm posting this on sandbox first, because this might not be a good challenge for this site, or just too complicated, because it's about constructing a meaningful sentence. Please, tell me, if it's appropriate task for this site.
Also a note: If you want, I can wait for Christmas with this.
Bac...
Non-math explanation
This is an explanation that is meant to be approachable regardless of your background. It does unfortunately involve some math, but should be understandable to most people with a middle school level of understanding
A pointer sequence is any sequence such that a(n+1) = a(n-...
How can I shorten:
p=gets.to_i
a=gets
b=gets.to_i
If my input is an integer, followed by a string, followed by an integer?
This is a fewest-operations challenge where the objective is to sort a vector into ascending order using the fewest reversals. Your algorithm can only sort the vector using "sub-vector reversals"1, but it can use other operations for arithmetic operations, loops, checking if it's sorted etc. The ...
Let's say you have a positive integer N. First, build a polygon, that has N vertices, with the distance between every vertex being 1. Then connect lines from every vertex, to every other vertex. Lastly, calculate the length of all lines summed up together.
Example
Given the input N = 6, build a...
