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Questions tagged [kolmogorov-complexity]

Kolmogorov complexity, informally, is the amount of code it takes to describe or produce a constant object, such as a string or image. When posting a challenge in this category, please make sure it adds something new to existing challenges.

0
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6answers
1k views

How random is the Gettysburg Address [duplicate]

Your program must print out the Gettysburg Address. I copied this text from Wikipedia: Four score and seven years ago our fathers brought forth on this continent a new nation, conceived in liberty,...
43
votes
21answers
5k views

One Ring to rule them all. One String to contain them all

Objectives: Output a String which contains every positive integer strictly below 1000. The obvious answer would be to concatenate every one of them, and that would create a String of 2890 characters (...
17
votes
7answers
1k views

Build a “BizzFuzz” program

In traditional FizzBuzz, you are asked to print the numbers from 1 to 100, but replacing every multiple of 3 with "Fizz", every multiple of 5 with "Buzz", and every multiple of both 3 and 5 (i.e. 15) ...
19
votes
33answers
3k views

Generate a Universal-binary-function Lookup Table

This is tangentially related to my quest to invent an esoteric programming language. A table of the binary numbers 0 .. 15 can be used to implement a Universal Binary Function using indexing ...
3
votes
3answers
1k views

Print element from the periodic table [duplicate]

Your task is simple: given a number as an input, you have to print the English name of the chemical element with that atomic number, up to and including ununoctium. For example, for an input of 77, ...
28
votes
36answers
3k views

Print an arch of ascending / descending numbers

I figured an "arch" was the best way to describe this pattern of numbers: ...
17
votes
63answers
3k views

Print this Multiplication Table

Write shortest code to print the following Multiplication Table: ...
29
votes
21answers
12k views

Count from 1 to 100… in Roman Numerals

Write a program that count from 1 to 100 in Roman Numerals and print these numbers by standard output. Each one of the numbers must be separated by spaces. You cannot use any built in function to ...
7
votes
5answers
3k views

Normal distribution values

Write the shortest program possible which outputs a table of Normal distribution values phi(z) = Integral[t from -infty to z of e^(-t^2/2) /sqrt(2 pi) dt] for <...
29
votes
5answers
2k views

Who's that Pokémon?

Input: an integer N between 1 and 151 Output: the Nth Pokemon. Rules You may use one data file. You may not use any already made data decompression algorithms. This includes libraries and other ...
13
votes
22answers
3k views

Smile! Just smile

It's well known that Brainf*ck is very bad at Kolmogorov-complexity problems, for example, it requires around 100 characters just to print "Hello world". However, there might be texts where Brainf*ck ...
74
votes
86answers
12k views

Print this diamond

This question has been spreading like a virus in my office. There are quite a variety of approaches: Print the following: ...
7
votes
12answers
1k views

Generate the names of the keys on a piano

On a standard 88 key piano, each key has a scientific name. The first three keys are A0, B♭0, and B0. The keys then proceed through C1, D♭1, D1, E♭1, E1, F1, G♭1, G1, A♭1, A1, B♭1, B1, and start over ...
17
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17answers
2k views

Display the result of doing 8 perfect shuffles of a deck of cards

Explanation A perfect shuffle is where a deck of cards is split exactly in half and the cards from each pile are alternately interleaved. The original bottom cards and the original top card must be ...
43
votes
37answers
14k views

Draw A Sierpinski Triangle

The Sierpinsky Triangle is a fractal created by taking a triangle, decreasing the height and width by 1/2, creating 3 copies of the resulting triangle, and place them such each triangle touches the ...
248
votes
63answers
69k views

We're no strangers to code golf, you know the rules, and so do I

Write the shortest program that prints the entire lyrics of "Never Gonna Give You Up" by Rick Astley. Rules: Must output the lyrics exactly as they appear in the above pastebin*. Here's the raw dump:...
56
votes
103answers
11k views

List of primes under a million

This is my first code golf question, and a very simple one at that, so I apologise in advance if I may have broken any community guidelines. The task is to print out, in ascending order, all of the ...
39
votes
9answers
11k views

Write the shortest program that generates the most compiler warnings and errors

The challenge: Write a very short program that, when compiled, creates the most amount of compiler warnings and errors. It can be written in any programming language. Scoring: The score is ...
20
votes
2answers
8k views

Shortest ELF for “Hello world\n”? [duplicate]

Is it possible to write (pack) a shorter than 145 bytes version of a program with "Hello world" (plus new line) output if the length of the program is measured as a number of bytes in program's ELF (...
15
votes
14answers
1k views

Calculate a user's privileges on CodeGolf.SE

The Challenge Your goal is to write the shortest program possible that will take a list of events (such as upvote, downvote, etc) and return the user's reputation and the privileges that he has ...
32
votes
10answers
10k views

Brainf*** Golfer

One of easiest code written by a programming language is a program printing sequence of characters (ex. "Hello, world!"). However, some esoteric programming languages like Brainfuck, even this ...
10
votes
9answers
1k views

Encode an image inside of the source

The golf challenge is to encode and compress the following image inside a source file. To do this you need to write 3 functions: red, ...
5
votes
5answers
552 views

An Old Irish Blessing, reasked (without using encodings)

How much can you golf a program to print "An Old Irish Blessing" without using unprintable ASCII characters? That restricts us to ASCII characters 32-126 (better still, 32,65-90,97-122 and 13(CR)) ...
7
votes
9answers
4k views

ASCII Tux (Linux Penguin) [closed]

I once hacked upstart on my Ubuntu box so that a colored, themeable ASCII Tux displayed on the screen with the boot messages scrolling beneath him. I'm curious to ...
14
votes
17answers
5k views

Say “Hello” to the world in ASCII art

Challenge: Produce the following output using as few chars as possible: ...
17
votes
24answers
9k views

12 Days of Christmas Lyrics

I thought this would be a fun challenge for everyone and I'm curious to see the solutions people come up with. Print the "12 Days Of Christmas" lyrics ...
26
votes
74answers
12k views

Print a Christmas Tree

The Challenge Print a nice Christmas tree with it's own star at the top using the shortest code possible. The tree star is an asterisk (*) and the tree body is ...
8
votes
22answers
1k views

Display Peter's keyboard pattern

Assume an simple keyboard with this layout: 1 2 3 4 5 6 7 8 9 0 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z . , ? ! Peter's keyboard pattern can be ...
22
votes
23answers
3k views

There Was an Old Lady

Your goal is to write a program that prints the following poem exactly as it appears here: ...
7
votes
4answers
2k views

Generating BF-code with single purpose

I'd like to see you create code (in any programming language) that output working BF (Brain***k) code. Your program have a single character input on stdin. The input should be one digit ("0", "1", "2",...
13
votes
4answers
507 views

Pinyin Combinations

Create a function that takes a string of a pinyin syllable as the argument, and returns true of the combination exists, false otherwise. Use "v" for "ü". Here is a full list of combinations. http://...
16
votes
8answers
5k views

Shortest, lexicographically smallest generating string

A string x generates a string y if y is a substring of an infinite repeat of ...
5
votes
8answers
1k views

LED Numbers and Letters

The program must print the following block of text of LED numbers exactly. ...
36
votes
37answers
4k views

Print the alphabet four times

The program must print the alphabet four times: first in the normal alphabetical order, second in the order of a qwerty keyboard, third in the order of a dvorak keyboard, and lastly in reverse ...
65
votes
120answers
13k views

The alphabet in programming languages

Our task is to, for each letter of the (English) alphabet, write a program that prints the alphabet, in a language whose name starts with that letter. Input: none Output: ...
12
votes
8answers
1k views

An Old Irish Blessing

I don't know who coined these words, and I'm not Irish, but I give you an Irish blessing: ...
15
votes
10answers
3k views

Calculate digits of Pi

This is a somewhat different task. Calculate 1024 hexadecimal digits of π, beginning at the 1024th hexadecimal place. Formally: Your program should complete in less then 1 minute and produce the ...
17
votes
7answers
2k views

The Tic Tac Toe Dictionary

A TicTacToe game can be represented by a string denoting the sequence of positions as the players make their move. 0 1 2 3 4 5 6 7 8 Assume ...
21
votes
6answers
3k views

Koch Snowflake - codegolf

The Koch snowflake (also known as the Koch star and Koch island) is a mathematical curve and one of the earliest fractal curves to have been described. It is based on the Koch curve, which appeared in ...
5
votes
3answers
995 views

->The Tragedy of Macbeth<- [closed]

The Setup Here you can find the full text of The Tragedy of Macbeth. If you view the source, and save it as text, you will notice it comes out to 206,244 total characters (including the whitespace ...
65
votes
117answers
19k views

99 Bottles Of Beer [closed]

Recreate '99 bottles of beers on the wall'. The desired output is this: ...