All Questions
Tagged with code-challenge source-layout
49 questions
19
votes
3
answers
986
views
Magical BF: BF code that works in two ways
Challenge
In this challenge, we will use a language that is very similar to Brainfuck but slightly different.
This variant of BF does not have any input and output commands; instead, it simply takes ...
- 78.8k
30
votes
44
answers
4k
views
Repeat your program to print Fibonacci numbers
Write a program fragment so that, when repeated N times it prints the Nth Fibonacci number. For example, if your program is print(x) then:
...
- 13.8k
27
votes
28
answers
4k
views
What's the Missing Code? (Cops)
Cops' Challenge
Robbers' challenge here.
It has now been four days since the challenge was posted so all new answers should be marked as non-competing in the title. These answers can still be cracked ...
- 1,155
13
votes
10
answers
913
views
From code to golf (Cops' thread)
This is a cops-and-robbers challenge, the robbers' thread is here
You can change the word code into golf by changing a letter at ...
- 45.1k
26
votes
8
answers
2k
views
Write some Genetic Quines
In this challenge, you'll create some programs which behave similarly to genes. When you run one, it will return one of its two "alleles" (a half of its source code), and concatenating any ...
- 19.1k
26
votes
11
answers
5k
views
Make a Hello World using as many bytes as possible
Write a program that outputs the exact string:
jan ale o, toki!
("Hello, world" but in toki pona to prevent builtins.)
with an optional trailing newline.
...
- 101k
40
votes
31
answers
4k
views
Concatenated halting problem: no + no + ... = yes
Challenge
Write \$2 \le n \le 10\$ distinct, valid non-halting full programs in your language of choice. If all of them are concatenated in order, the resulting full program should be a valid halting ...
- 78.8k
6
votes
1
answer
378
views
Two Diehards Make a Glider
In Conway's Game of Life, there is an infinite square grid of cells, each of which is alive or dead. The pattern changes each "generation". A dead cell with exactly 3 live neighbors (...
- 9,969
4
votes
0
answers
226
views
5 tasks in (modified) BrainF**k from the Estonian OI [closed]
Introduction
This challenge appeared in the 2020 Estonian Open Informatics Olympiad and was created Sandra Schumann. I thought it was interesting because it involves symmetry and is quite hard even to ...
- 141
13
votes
3
answers
635
views
Writing erasable code
My phone number (which I will not be sharing here) has a neat property where there is a two digit number, which when iteratively removed from my phone number will eventually remove all the digits. ...
- 101k
30
votes
4
answers
3k
views
Orientation Oriented Programming
Write a program for a specific language that in different orientations performs different tasks.
Your code should have at least two non-empty lines and at least two non-empty columns and should ...
- 24.5k
33
votes
22
answers
5k
views
Pass on your radiation
The task here is pretty simple. You should write a program that takes a string as input and outputs it (that is a cat program).
Additionally when the \$n\$th byte of your program is removed (without ...
- 101k
11
votes
7
answers
498
views
A Change in Perspective
In this challenge you will write a piece of text which when viewed from two different angles will create two different programs.
Your string as viewed from above must take a string containing only ...
- 101k
37
votes
28
answers
4k
views
Is the matrix centrosymmetric... and so is the code?
Defintion
A centrosymmetric matrix is a square matrix that is symmetric about its center. More rigorously, a matrix \$A\$ of size \$n \times n\$ is centrosymmetric if, for any \$i,\: j \in ([1, n] \...
- 42.6k
41
votes
9
answers
5k
views
Shifting-Oriented Programming
A string can be shifted by a number n by getting the byte value c of each character in the string, calculating ...
- 26.3k