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Questions tagged [source-layout]

For challenges that involve the physical layout or physical manipulation of source-code.

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15answers
2k views

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 ...
35
votes
17answers
3k views

Hidden Inversions (Cops' Thread)

This is a cops-and-robbers puzzle the robbers' thread can be found here. Your task will be two write two programs (or functions) such that they are anagrams of each other and one performs the left ...
5
votes
1answer
265 views

Shrink your language's character set [duplicate]

We often get restricted-source questions here on PPCG that favour submitting solutions using only a subset of characters (sufficiently so that there's a tag printable-ascii that identifies a ...
17
votes
7answers
922 views

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 ...
10
votes
2answers
832 views

Positional Awareness

Positional Awareness Your task is to generate a program that, for every permutation of its characters (which includes the original program), outputs the positions of every character relative to the ...
74
votes
11answers
5k views

Error 404: Character Not Found

Scenario One of your friends is struggling on a homework assignment. He needs a simple program which prints the first 404 natural numbers: ...
102
votes
32answers
11k views

What are the five most powerful characters in your language?

Choose any five characters your language supports. There are 5! = 5×4×3×2×1 = 120 ways these can be arranged into a 5-character string that contains each character once; 120 ...
32
votes
20answers
2k views

Figure and Ground

Source: Wikipedia For this challenge, you should write two programs which resemble the figure and ground of the above image, such that one of them prints figure ...
39
votes
19answers
3k views

Program template for printing *any* string

Write a program with the following properties: When run as-is, the program produces no output (i.e. 0 bytes of output). There is a location within the program (of your choice: it could be at the ...
8
votes
10answers
402 views

Make your program sequential! [closed]

Your task, if you choose to accept it, is simple. Objective You must make a program that, when run, prints some (as many as you want) terms in a sequence that you choose. The sequence must be a ...
13
votes
2answers
4k views

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 ...
27
votes
2answers
722 views

Hyper about quines

Inspired by Hyperprogramming: N+N, N×N, N^N all in one. Thanks to @MartinEnder and @trichoplax for their help in the sandbox. Definitions Hyperquines Define a hyperquine of order n as a quine-...
153
votes
4answers
13k views

Hyperprogramming: N+N, N×N, N^N all in one

Write a program that takes in a number N from 1 to 9 inclusive. In its native form your program should output N+N. E.g. output 2 if N is ...
1
vote
1answer
299 views

“HHeelllloo,, EEaarrtthh!!” [duplicate]

Much like this challenge, write a program or function that takes no input and prints or returns the string Hello, Earth! with an optional trailing newline. The ...
19
votes
2answers
503 views

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 ...
17
votes
15answers
2k views

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. ...
11
votes
2answers
392 views

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 ...
17
votes
3answers
2k views

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: ...
17
votes
7answers
916 views

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 ...
47
votes
3answers
4k views

Coding Around The Clock

Write a single line program two or more characters long that contains no line terminators and takes no input. For example, your program might be: MyProgram When ...
13
votes
11answers
1k views

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!" ...
12
votes
21answers
1k views

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 ...
31
votes
19answers
2k views

Inverse function

Wouldn't it be neat if programming functions could be inverted, just like the mathematical function they implement? Write a function (or program) that takes one input ...
7
votes
3answers
158 views

The confused twister

The basic idea is to write a program that twists itself, and the twisted version untwists itself. The first program will just be the twisting algorithm described here, and when given its own source ...
31
votes
9answers
7k views

Build a twisted “Hello world!”

Your job is quite simple, write a program that prints Hello, world!, that when twisted creates a program that prints Twister!. ...
21
votes
2answers
460 views

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 ...
20
votes
2answers
1k views

90° Self-Rotating Program

Introduction Write a complete program that rotates a rectangular block of ASCII characters 90 degrees clockwise. When the program itself is rotated 90 degrees clockwise, it rotates a block of ASCII ...
17
votes
4answers
1k views

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 ...
28
votes
7answers
2k views

Source Code Metamorphosis

mbomb007 asked us to make a self mutilating program. Its an interesting challenge, but I personally don't like to encourage my programs to be self-mutilating. I like to think that, at the heart of ...
16
votes
17answers
2k views

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 ...
29
votes
8answers
3k views

Beatles Songs and Hexagons

Write two triangle (i.e. pyramid) shaped programs. The first one should be an upwards pointing text triangle with a minimum base width of three characters. So it would have a structure like ...
40
votes
8answers
6k views

40 Numbers in 9 Bytes

There are 40 ways a directed Hamiltonian path can be arranged on a 3×3 grid: This graphic (thanks Sp3000!) shows only the 20 undirected paths. Traverse each colored line in both directions for ...
24
votes
7answers
2k views

XOR encrypt your programs with the source of other programs

Write two programs such that when the bytes of their source code are XOR-d together it produces a third, valid program, all in the same language. The length of each of the three programs in bytes must ...
31
votes
6answers
3k views

Write A Program That Outputs Its Mirror Level

There are 95 printable ASCII characters: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~ In the ...
33
votes
11answers
2k views

Multiplication by Self-Modification

...at least for some definition of "self-modification". The Task In this challenge, your task is to write three strings A, B ...
16
votes
6answers
438 views

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 ...
32
votes
3answers
2k views

Programming Tetris Blocks (Literally)

In the game Tetris, there are 7 types of bricks or Tetriminoes, which are mathematically known as tetrominoes because they are all made with 4 square segments: The have the names I, J, L, O, S, T, ...
13
votes
7answers
413 views

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: ...
21
votes
4answers
2k views

Pure Sourcery - Shaping programs that output the digits 0 through 9

Here's a pixelated 5 by 7 font for the digits 0 through 9: ...
46
votes
16answers
5k views

Sierpinskified Code

Write a rectangular block of text that when arranged into a Sierpinski carpet, using same-sized blocks of spaces for the empty portions, creates a program that outputs the iteration number of the ...
21
votes
12answers
2k views

Reading Code in 8 Ways to Output 8 Numbers

The English language and most programming languages are written and read from left-to-right, top-to-bottom, but that needn't be the case. In fact for the block of text ...
32
votes
9answers
4k views

One hundred passwords

I have one hundred vaults, each one within another. Each vault has a password, consisting of a single number. 95 43 81 89 56 89 57 67 7 45 34 34 78 88 14 40 81 23 26 78 46 8 ...
30
votes
24answers
2k views

Join N copies of a snippet to produce N^2 characters

Challenge Write the shortest snippet of code possible such that, when N copies of it are concatenated together, the number of characters output is N2. N will be a positive integer. For example if ...
20
votes
3answers
1k views

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 this ...
4
votes
0answers
92 views

Resistent counter [duplicate]

You just have to ouput exactly all the numbers from 1 to 10 separated by spaces. Your programme should work all the times even if a random character is deleted before compiling/interpreting. This is ...
17
votes
36answers
3k views

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 ...
9
votes
4answers
518 views

Write a binary counter in quine

Write two code fragments, which we will call s_zero and s_one. Program (l, n) consists of l copies of s_zero and s_one corresponding with the digits of n in binary, padded with s_zero on the left. ...
10
votes
4answers
735 views

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 bought a ...
1
vote
4answers
455 views

All those duplicate questions deserve duplicate code to show them off

All those questions that are duplicates... Ignored and marginalized by society. It is just not... right. We have to do something. There surely must be love for them too. They feel appreciated if a ...
6
votes
3answers
499 views

Retrograde morse (d)e(n)coder

This question is inspired by retrograde music. Retrograde music is a piece of music that can both be played normally (from the beginning to the end) as reversed (from the end the beginning). A similar ...