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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.

34
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32answers
6k views

Create a Magic 8 Ball

As a child, my friend had a magic 8 ball that we would ask questions to and see what the fate of that question was. Challenge Your challenge is to write a program (or function) that when run (or ...
37
votes
38answers
4k views

Hast Thou Slain the Jabberwock?

Your task is to output the exact string The Jabberwocky without taking input. Normal rules for input and output apply, so both functions and programs are ...
10
votes
4answers
287 views

Continued Fraction of Digit-wise Sum of Square Roots

Introduction Your task is to generate the first 1000 terms in the continued fraction representation of digit-wise sum of square root of 2 and square root of 3. In other words, produce exactly the ...
-4
votes
3answers
253 views

Print the numbers -1, 0, 1 [duplicate]

This is a very simple challenge, and it is to print the numbers -1, 0, and 1. The following ...
26
votes
13answers
8k views

Print “Hey Jude” from The Beatles

Your task is to write a program which prints following four verses extracted from the lyrics from The Beatles' song "Hey Jude" (© Sony/ATV Music Publishing LLC): ...
35
votes
44answers
7k views

Kolmogorov shifter

Output or display the following three lines of text, exactly as they are shown below. A trailing newline is accepted. ...
12
votes
3answers
639 views

A Zealous “Quick Brown Fox” “Jumped” Along the Groovy Spiral

Introduction Write a program to output the outgoing spiral of the famous pangram following given rules. Challenge A pangram is a sentence using every letter of a given alphabet at least once. One ...
43
votes
10answers
5k views

Falcon Heavy stages

Choose a set of four bytes without replacement (i.e. no byte repeated), and not necessarily in any particular order, from any one of the following four sets: The characters of any one single-byte ...
61
votes
161answers
14k views

The Programming Language Quiz, Mark II - Cops

A repost of this challenge. Meta discussion. Sandbox post. Body of the question similar to the original Robber's challenge This cops and robbers is now (08/03/2018) closed to further competing cop ...
11
votes
12answers
1k views

List all palindromic prime dates between 0000-01-01 and 99999-12-31

You know what a palindrome, a prime and a date are. Your task is to list all dates in 100 thousands of years that fulfill all three characteristics. Nevermind anything but the numbers, use the ...
25
votes
48answers
2k views

Confusing Alphabet Staircase

Given no input, output this interesting alphabet pattern in either case (the case has to be consistent) via an accepted output method: A AB ACBC ADBDCD AEBECEDE AFBFCFDFEF AGBGCGDGEGFG AHBHCHDHEHFHGH ...
25
votes
23answers
4k views

Traffic direction

Rules Given an ISO3166-1-Alpha-2 country code your task is to decide on the traffic direction for that country: Input will be a valid country code (valid as in it's an element of the two lists ...
4
votes
9answers
331 views

Print the alphabet Christmas tree

I know it's 1.5 weeks after Christmas but trying to print an isosceles triangle in a monospaced font makes it look weird. Challenge Print the alphabet from A to Z so that it forms a filled triangle ...
42
votes
40answers
3k views

A Programming Puzzle of Mode Golf

Your task is to print the text Good morning, Green orb!, with every character repeated in place as many times as the most frequent byte in your source (the mode). ...
1
vote
30answers
803 views

Exponential-ish number sequence

Your program must print out this exact sequence: 1 2 4 10 24 54 116 242 496 1006 2028 4074 8168 16358 32740 65506 131040 262110 NOPE! As usual, shortest program ...
22
votes
3answers
451 views

Draw an ASCII key signature

Given an input of a note, output an ASCII drawing of the corresponding major key on the treble clef. Here are all the major keys (that don't include double-sharps or double-flats) and their ...
19
votes
16answers
2k views

Mirrored Digital Clock

Many digital clocks display the time using simplified digits comprised of only seven different lights that are either on or off: When mirrored horizontally, the digits ...
37
votes
69answers
4k views

A very long Terza Rima

Description Output the rhyme scheme for a very long Terza Rima. Input None. Output ...
17
votes
97answers
4k views

Output the language name times the number of characters [closed]

Challenge: Your task is to use any language to output that language's name times the number of character's in its name. Use the common name or acronym of the language. If there are multiple ...
21
votes
11answers
2k views

Unicode Fractions

Given a fraction in the format m/n (where m and n are coprime integers), output the corresponding Unicode fraction. Your program/function will not be expected to ...
17
votes
7answers
1k views

Electron Configuration

In atomic physics and quantum chemistry, the electron configuration is the distribution of electrons of an atom in atomic orbitals. For example, the electron configuration of the neon atom is 1s2 2s2 ...
12
votes
21answers
2k views

Iterated phi sequence

Related: Iterated phi(n) function. Your challenge is to compute the iterated phi function: f(n) = number of iterations of φ for n to reach 1. Where ...
20
votes
11answers
2k views

Print me a scale

Oh no! I have a theory test soon and I don't remember the scales yet! Help me remember my major scales by printing the following: ...
4
votes
13answers
3k views

Coffee Machine Machine

You left your computer for too long, and it went to sleep. Wake it up again by printing the following coffee maker. ...
13
votes
24answers
2k views

Scoop me an icecream please

Make me an icecream cone please We have a ton of great ice cream places here in New England. Most of them are closed for the winter now, so... ...
0
votes
4answers
430 views

The thousand character classic

Background The Thousand Character Classic is a chinese poem written around the 4th Century CE in China, and memorized by large populations since then. The name comes from not only its length, but its ...
11
votes
18answers
1k views

Reversed Engineered from Uniqueness (Robber's Thread)

Given the output of the cop's program (o), the byte-count (n) and the number of unique bytes (...
30
votes
93answers
5k views

Alphabet Staircase

The Challenge Your task is to create a program or function that outputs the following with no input: ...
7
votes
5answers
455 views

Demonstrate a lower bound for the Ramsey number R(4,4)

A special case of Ramsey's theorem says the following: whenever we color the edges of the complete graph on 18 vertices red and blue, there is a monochromatic clique of size 4. In language that ...
-3
votes
23answers
473 views

8 8's make 1000

Print the following output of a happy coincidence addition pattern: 8 8 8 88 +888 ---- 1000 Rules: No leading spaces except the ones already present ...
53
votes
23answers
7k views

Confirm the Illuminati

The Illuminati commands you (with their mind control) to output the following string: ...
69
votes
23answers
3k views

Output the PPCG Prime

This is the PPCG Prime 624 digits long ...
4
votes
17answers
374 views

Any digital permutation

Task Your task is to output a single integer, with one restriction: its digits must be a permutation of [1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 5, 5, 6, 6]. For example, you could output 653443653152432, ...
14
votes
25answers
2k views

Hopping numbers

TASK print integers n, where 12 <= n <= 123456789, and all pairs of consecutive digits in n have the same positive difference between them (e.g. 2468 but not ...
42
votes
51answers
6k views

There are known knowns

Former US Secretary of Defense, Donald Rumsfeld, famously popularized the phrase "known knowns." Here we're going to distill his remarks into a four-line stanza. Specifically, output this text: <...
18
votes
9answers
2k views

How many chapters do I have?

The Bible is one of the most influential books ever written, and commonly cited as the best selling book of all time. It was written by approximately 40 different authors over hundreds of years before ...
19
votes
22answers
2k views

Build a checkerboard

For this challenge you will print the coordinates and color of each piece at the start of a game of checkers. Enter the x and y (comma seperated) for every square (indexed 0-7) on a checkerboard, ...
23
votes
8answers
1k views

Casciitum Scribe

Introduction Cacti come in various different sizes, shapes and colors. However, the most iconic cactus and must-have in every Western has to be the saguaro. Important features are its size and arms, ...
30
votes
14answers
3k views

Generate TeX to typeset Sierpinski Triangle Fractal

Challenge Write code that outputs TeX (LaTeX) math-equation code (given below) that will typeset Sierpinski Triangle Fractal of 5 levels. Shortest code wins. Details TeX (and friends like LaTeX, ...
17
votes
23answers
2k views

Simple complexity

Output # # # # # ##### ## # ## #### ####### # # ## #### ## ## # ### ####### ...
38
votes
23answers
3k views

Output the Trinity Hall Prime

Based on this Math.SE question; number copied from this answer. Number originally from a Numberphile video, of course. Your task is to output the following 1350-digit prime number: ...
61
votes
98answers
7k views

Make an alphabet searchlight!

Inspired by a bug in a solution to this challenge, your challenge is to produce this exact text: ...
4
votes
9answers
488 views

There's no place like home

I recently watched The Wizard Of Oz and thought that when Dorothy taps her shoes together three times, it would be easier if she used a program to do it. So let's help her. Task Output slippers ...
36
votes
28answers
10k views

When do I get my sandwich?

Given one of the following inputs: Sweet Onion Chicken Teriyaki Oven Roasted Chicken Turkey Breast Italian BMT Tuna Black Forest Ham Meatball Marinara output a number from 1-7 (or 0-6) representing ...
26
votes
35answers
3k views

Euro coins and notes

As the majority of nations using the Euro have the , as the decimal separator, you must use it also. The task is to output all the values of the Euro coins and ...
7
votes
4answers
369 views

1326 starting hold'em combos

The goal is to get all combinations of hold'em starting hands (every two card combination) in the shortest amount of code. A hold'em hand is two distinct cards dealt from a standard deck of 52 cards, ...
1
vote
1answer
125 views

Code Golf Banner [duplicate]

Ouput the following banner: ...
28
votes
28answers
3k views

First they came

"First they came..." is a poem by Martin Niemöller: ...
13
votes
18answers
18k views

Walkers Join! - Alan Walker's logo

You might know Alan Walker from his ever popular song Faded. Now his "followers" are called Walkers and they have a logo, here is a simplified version: ...
-6
votes
19answers
333 views

Code Golf - Covfefe on tap

As we all know, negative press covfefe has been conspiring to bring down the American president for some months now. There's also, definitely, an algorithm in play in that word. Covfe is a refreshing ...