Questions tagged [source-layout]
For challenges that involve the physical layout or physical manipulation of source-code.
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Anagramming Stack Exchange question titles into programs
Stack Exchange currently has 134 question and answer sites. This includes all beta sites (such as PPCG) but not Area 51 proposals nor any meta sites, except for the "mother meta".
To answer ...
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Compile Regexes (By Substitution)
Your task is to compile regexes... by specifying a substitution for each character in a regex.
Regexes
The regexes support these
...
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Chuck Norris vs Travelling Salesman
Introduction
Almost everyone is familiar with the Travelling Salesman Problem (TSP). The task is to, given a list of N cities, find the minimum Hamiltonian cycle ...
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Which character to change (Cops)
Robbers Thread
Cops, your task is to chose a program that prints a string (you can choose).
Although, if you change 1 character in your code, it should print another string.
But there's a twist: You ...
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"Hello, World!" (Every other character, Part 2)
As a kind of part 2 to Hello, World! (Every other character), write a program such that all three of these programs print "Hello, World!": the entire program, the 1st, 3rd, 5th, etc. characters of ...
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Hello, Toroidal Earth!
Your task is to create a program that outputs the string:
Hello, Toroidal Earth!
with an optional trailing newline.
Additionally if I remove the first line1 of ...
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I multiply the source, you (probably) multiply the output!
Task
The task is to write a program that outputs a consistent but otherwise arbitrary positive integer \$x\$ (so strictly greater than 0). Here's the catch: when the source is repeated \$N\$ times (...
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The Fatal Error Challenge
Objective
Write a routine that accepts a string of printable ASCII characters, s, and returns a string containing the same characters as s, reordered so that no two-character substring appears more ...
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Write a program that is valid after circular character shift
Potentially very difficult, but I've seen some amazing things come out of this site.
The goal is to write a program, in any language, that does whatever you want. The catch is that the program must ...
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I palindrome the source code, you palindrome the input!
This is a rip-off of a rip-off of a rip-off of a rip-off of a rip-off. Go upvote those!
Your task, if you accept it, is to write a program/function that outputs/returns its input/args. The tricky ...
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The reversible reverser
Your task is simple. The program reads in a line of text from the standard input, and it prints out the same text in a character-reversed form. It is not allowed to print anything else.
For example:
...
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The repetitive byte counter
Your task is to write a non-empty program / function of byte count L, which, when repeated M times, checks whether a given positive integer N is equal to L × M.
You should, in theory, support an ...
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Find the Needle in the Haystack (Robbers)
This is part of a cops-and-robbers challenge. Go here for the cops' part.
The Robbers' Challenge
A cop's answer can be cracked by removing any subset of characters from the Haystack program, so that ...
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Two In One: Guess That Language - Cops
Robber's challenge
This cops-and-robbers challenge challenges the Cop to write a non-empty program that, when run, produces some non-empty output in language A, and, when reversed, produces some non-...
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Make an interweaving quine
Your task is to create a program that, when run, returns itself as output (this is known as a quine). However, this quine must, when it is copied n times, returns ...
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Write a function that tells you which TWO of its lines has been removed
In my previous code challenge, I asked you to write a function that tells you which of its lines has been removed.
The instructions were:
Write a function that contains five lines.
If you run ...
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Choose-Your-Own-Language Code
Let's take a grid of 16x16 printable ASCII characters (code points 0x20 to 0x7E). There are 30-choose-15 paths from the top left to the bottom right corner, making only orthogonal moves, like the ...
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Hello, Permutations!
For this challenge, you will be required to write 3 programs:
The first program should be a quine, i.e, it should print it's own source code.
The second program should read the input and print all of ...
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The Jigsaw Code Puzzle
This is an answer-dependent challenge! The order of answers matters, and your exact task depends on the last answer that was posted. You might want to sort the answers by oldest.
Let's piece together ...
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Print a Symbolic Negative of your Code
(This is a variation on Print a Negative of your Code, which I enjoyed a lot! Thanks to Martin Büttner♦ - almost all of this text is his.)
Let's consider the symbols to be the following printable ...
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Build a half cardinal cyclic quine
A half cardinal cyclic quine is a cyclic quine with two states, one perpendicular to the other.
Rules
You can decide which rotation you want to implement, clockwise or counter-clockwise.
Once ...
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15
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Write a program that outputs the number of times it has been run [duplicate]
In a programming language of your choice, write a full program that, when run, prints a positive integer N and then modifies its own source file such that the next time it is run it will print N+1.
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Russian Nesting Quine
A Russian nesting doll, more commonly known as a Matryoshka doll, is a doll which contains a smaller version of itself, which then contains another smaller version of itself, which contains a smaller ...
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Normal and visual string reversion
Write some code that acts as a cat program. That is, to input a string and output it as is. But the normal reversion of your code must output the normal reversion of the input string. And the visual ...
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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 ...
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Hidden Inversions (Robbers' Thread)
This is a cops-and-robbers puzzle, the cops' thread can be found here.
Your task will be to find an anagram of the provided programs in the cops' thread that performs its left inverse.
Once you ...
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Double-duty quine: quine!dlroW ,olleH
Write a program that will output its own source code when run, and nothing else. Seems easy, right?
The catch is that when the source code is reversed, your program must output "Hello, World!" ...
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Code close to the challenge: Inception
This is a sequel to this challenge: Code close to the challenge: Sum of integers
The challenge in this one is a bit harder, and also makes for a cool title (Which is why I picked it):
Calculate ...
user40734
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Princely Prefix by a Program in Pattern
You should write a program or function which outputs or returns as much of Chapter I of The Little Prince as it can. Your program or function has to be an M-by-N block of code containing only ...
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Primes with a twist
Note: this is heavily inspired by this question.
Task:
Your task is to generate the nth prime, when each character of your program is repeated ...
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3
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Write a program that always prints N when it is shifted N times up the ASCII alphabet
Write a program using only printable ASCII characters that takes no input. For reference, here are the 95 printable ASCII characters in order:
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Self-Mutilating Program
Simply put, your goal is to create a complete program that modifies its own source code until every character of the source is different than what it started as.
Please include the beginning source as ...
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Avoid duplicate entries using a sign change
This anecdote contains the following intriguing exchange:
"Fine, Fred," Avi interrupted. "Then how would you change this to
avoid duplicate entries?"
"Oh, just change that one there to a ...
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Find the biggest chunk
This challenge is not code golf. Please read the scoring before you attempt to submit an answer.
You will be given a multi-line string as input. You should output the size of the largest contiguous ...
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Deranged Rearrangements
Your task is to write a computer program such that when it is cut up into lines (split on the newline character) every arrangement of the lines will output a different number between 1 and n! (where n ...
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Error-detecting Self-repairing Program
Your task is to create a program where if any one character is deleted, it will detect which character was deleted and then re-insert the deleted character in its own source file.
For instance, if ...
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Sequential Multiplication
Your objective is to write a program that takes an input, and, when chained together N times, performs "sequential multiplication". What is sequential ...
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Longest Increasing Substring
Given a list of positive integers, write code that finds the length of longest contiguous sub-list that is increasing (not strictly). That is the longest sublist such that each element is greater ...
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Row, Column, Diagonal, Block
Write a square block of code that is N characters wide and N characters tall, for some positive integer N.
For instance, your N may be 5 and the block look like this:
...
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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 ...
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Backhanded Compliments
This challenge is created in celebration of my first esoteric language, Backhand!
Backhand is a one dimensional language with a non-linear pointer flow. The pointer moves three steps at a time, only ...
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5
answers
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Reverse your code, reverse the OEIS
The task here is to write a program that takes an natural number, \$n\$, and produces the \$n\$th term of an OEIS sequence. That sequence should have an identifier in the form of ...
- 98.5k
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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. ...
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Golf some quine stripes in different languages
You will choose m languages and write n programs in each language, each with length n*m. The kth program should output the kth character of each program, ordered by the program number.
For example, in ...
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Code a Code Slidey Puzzle!
The most recognizable sliding puzzle is the fifteen puzzle. It has a 4 by 4 grid, 15 tiles, and one empty grid space. The tiles can only move into the empty space and must always be in line with the ...
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Put the line in the code you nut and shake it all up
Using one programming language write 5 single-line programs, each of which outputs a different line of the first verse to Harry Nilsson's 1972 song "Coconut" when run individually:
Brother ...
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Shrinking Triangles
Write an infinite list of triangle codes, defined as code where the i-th line has i bytes for all lines, such that the i-th code generates (i-1)th code and has 1 more line than the (i-1)th code.
The ...
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Right and tfeL truncatable primes
A right-truncatable prime is a prime where every prefix is a prime (in base 10). A left-truncatable prime is exactly the opposite, where every postfix is a prime (primes that start with 0 aren't ...
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Code Crosswords - Solutions
This is the companion question for Code Crosswords. Robber answers go here.
See Where should we put robbers? for meta-info.
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Everyone Ought to Have a Friend
An isolated character is a character (other than a newline) that doesn't have an adjacent character of the same type. Adjacent characters can be to the left, the right above or below, but not ...
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