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Questions tagged [code-golf]

Code-golf is a competition to solve a particular problem in the fewest bytes of source code.

44 questions with no upvoted or accepted answers
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21 votes
0 answers
1k views

Find a Glider Synthesis (Game of Life)

Challenge Summary In summary, the challenge is to provide the glider synthesis for a Game of Life configuration, which is your input. What does this mean? Well, firstly, let me explain a few terms. ...
• 42.5k
13 votes
0 answers
544 views

Tips for Golfing in SQLite?

I was looking for this page to help me enhance my first answer with SQLite, but I couldnt find one. So here we are! What general tips do you have for golfing in SQLite? I'm looking for ideas that can ...
• 2,077
12 votes
0 answers
525 views

Is it a legal atomic chess move?

Background and Rules There is a variant of chess called atomic chess, which follows essentially the same rules as normal chess, except that pieces explodes other pieces around them when captured. In ...
• 13.8k
12 votes
0 answers
703 views

Finding Radical Ideals

Sandbox Finding radicals of arbitrary ideals in rings is hard! However, it's a doable task in polynomial rings, since they are Noetherian (all ideals are finitely generated) Background A quick ...
• 2,511
11 votes
0 answers
703 views

Lean golf: Balanced Bracket Sequence

Ungolfed, ugly, horrible proof to help you make progress on this challenge: https://gist.github.com/huynhtrankhanh/dff7036a45073735305caedc891dedf2 A bracket sequence is a string that consists of the ...
• 1,188
11 votes
0 answers
243 views

NP-complete reduction: (grid-)Hamiltonian circuit

Background Hamiltonian circuit problem is a decision problem which asks whether a given graph has a Hamiltonian circuit, i.e. a cycle that visits every vertex exactly once. This problem is one of the ...
• 78.1k
11 votes
0 answers
288 views

Cover positions with snakes of same 'colour'

Imagine a grid where the origin square $(0,0)$ is at the top left of the screen, and positive $x$ is rightwards whereas positive $y$ is downwards. Coloured squares are at various positions on ...
• 523
10 votes
0 answers
225 views

Optimize for Bgil Midol's slicing scoring

In Bgil Midol's question, the score of a sequence of slice is defined as sumof|startslices|∗2+sumof|endslices|∗2+sumof|stepslices|∗3 Such scoring method makes multiple slices possibly take less ...
• 25.6k
9 votes
0 answers
291 views

Tips for golfing in Chef

What general tips do you have for golfing in Chef? I'm looking for ideas which can be applied to code-golf problems and which are also at least somewhat specific to Chef (e.g. "remove unnecessary ...
• 4,177
8 votes
0 answers
482 views

Get ERC-20 token balance

Ethereum is a blockchain platform. It has its own native cryptocurrency, ether, but in this challenge, we'll be focusing on its ability to run smart contracts. The ERC-20 standard describes an ...
• 1,222
7 votes
0 answers
282 views

Write a proof checker for first order logic

This originally came from Give the best Chaitin incompleteness bound, but I realized that there was a fragment of this problem which still potentially gives a good coding challenge. First Order Logic ...
• 231
7 votes
0 answers
336 views

Count the length of head movement

Once upon a time I wanted to order custom tokens for a board game. They say they can do it, and then they present me their price list. I was confused because they charge per inch of head movement, and ...
7 votes
0 answers
406 views

Code Golf: BlackJack - best moves

The Challenge I was looking into small code examples for a specific language as a small tutorial and came accross a simplified Blackjack that should be implemented. In this Challenge you will have to ...
• 179
7 votes
0 answers
261 views

Decompose the domain

In scientific computing, it is often desirable to decompose some large domain into smaller "subdomains", then parallelize the computation by performing the work on each subdomain in parallel and the ...
• 2,733
6 votes
0 answers
284 views

Solve the word problem*

In this challenge you will receive a list of positive integers $W$ called a word, and a square symmetric matrix $M$. Your task is to determine if the word can be turned into the empty list by ...
• 99.3k
6 votes
0 answers
282 views

Shortest CSS selector to select ALL html elements, without using asterisk *

What is the shortest selector (by character count) to select ALL html elements on a web page, without using asterisk (*)? Some examples are the following: ...
• 169
6 votes
0 answers
211 views

Give the best Chaitin incompleteness bound

This was originally a pure mathematics question, but I think I've got the best chance for an answer here. The Challenge For concreteness, consider Peano Arithmetic (PA). For some language L of your ...
• 231
6 votes
1 answer
450 views

Further golfing this C# code from Scramble words while preserving their outlines

I'll start off by saying I checked and checked again that this question should be on topic. I will also clearly state that this is a tips question about further golfing a certain set of code not a ...
• 7,219
6 votes
0 answers
2k views

Probability to win a hand of poker (Texas hold 'em)

Challenge: In the last stage of a two players Texas hold 'em, given a two-card hand and five cards on table, determine your probability to win versus an opponent by the standard ranking of poker ...
• 455
5 votes
0 answers
271 views

Simulate the isotropic non-totalistic cellular automaton

There are many generalizations of Conway's Game of Life. One of them is the isotropic non-totalistic rulespace, in which the state of a cell in the next generation depends not just on its state and ...
5 votes
0 answers
242 views

Construct the suffix automaton

In computer science, a suffix automaton is the smallest partial deterministic finite automaton that recognizes the set of suffixes of a given string. (Wikipedia) Given a string $S$ consisting of ...
5 votes
0 answers
378 views

Another version of "The Bridge and Torch Problem"

The idea for this code golf puzzle is from link: The Bridge and Torch Problem The inspiration for this code golf puzzle is the Bridge and Torch problem, in which d people at the start of a bridge ...
• 169
5 votes
0 answers
367 views

Tetris overlooked move counter

Playing tetris is fun. Watching an AI play tetris is also fun. Some tetris AIs will always ignore the possibility of maneuvering a piece under an overhang, which makes me sad. It means that the ...
• 399
5 votes
0 answers
765 views

Chess Light Solver

Challenge Write a solver for the Chess Light puzzle game, in the smallest amount of code. The input will be a representation of a chessboard, how in yours is up to you. My examples below is textual, ...
• 1,314
4 votes
0 answers
282 views

Convert To Shorthand Part 2

Part 1 of the challenge revolved around converting the letters into specific unicode characters. Lore In this part we receive the output from the function made in Part 1, which now has to be arranged ...
• 517
4 votes
0 answers
221 views

Tips for golfing in Seriously

I am looking for tips to code in this golfing language Seriously, and was wondering what some of the ways for golfing this language is. "Remove comments" is not a tip. Actually is also ...
• 5,099
4 votes
0 answers
170 views

Tips for golfing in Objective C

Although on codingame.com, Objective C and C are two of the best golfing languages there, so I would like to know some of the best golfing methods (although I am a python person, I am currently trying ...
• 5,099
4 votes
0 answers
289 views

2017 SCRAM Finder

Background The nuclear industry has term, SCRAM, used to describe a quick shutdown of the reactor. There's a fun myth that it stands for "Safety Control Rod Ax Man," the role which served ...
• 1,608
4 votes
0 answers
245 views

Golfing Delayed Expansion Variables in Batch

Enabling delayed expansion variables in Batch chews up a lot of bytes. The shortest I have managed to make it is: @!! 2>nul||cmd/q/v/c%0&&exit/b ...
• 2,334
3 votes
0 answers
146 views

Tips for golfing in Emmental

What general tips do you have for golfing in Emmental? It is a self-modifying language defined by a meta-circular interpreter, so I wonder if there are tips for golfing for this esoteric programming ...
• 421
3 votes
0 answers
105 views

Tips for golfing in Arn

Does anyone have tips on how to golf in this language? Please one tip per answer and avoid posting simple and general tips such as "remove whitespace". Here is the github link and here is ...
• 5,099
3 votes
0 answers
187 views

Conic Section Characteristics

Given the equation of a non-parabolic non-degenerate conic section, output some of its properties. Specification Some info on conic sections: For more info, visit Wikipedia For an equation of the ...
3 votes
0 answers
311 views

Rope&Nail logic

Related, both rope, nail and falling, but reversed and some other differences Consider a loop of rope hanging on n nails on a row. Given a table showing whether ...
• 25.6k
3 votes
0 answers
156 views

Tips for golfing in SageMath

SageMath is an open-source mathematics software system, built on Python 2. Its extensive math library support makes it a strong choice for golfing in math-based challenges. What tips do you have for ...
3 votes
0 answers
302 views

Code Golf Pro Golfer Least Swings Calculator

Your Challenge: For a golf Course Of Inputted 'n' length to hole where: ...
• 67
3 votes
0 answers
398 views

Create a World Cup overview

I'm not to sure about the title so feel free to suggest a better one. Task/challenge Create an overview for the World Cup tracking the cup from the group phase till the finals. Group phase There ...
• 2,627
2 votes
0 answers
204 views

Shortest way to cause a seg fault at 0x9c?

In honour of CrowdStrike's exception at 0x9c, what's the shortest way (character-wise) to cause a segfault by dereferencing address 0x9c? The best I can come up with is: ...
• 49
2 votes
0 answers
174 views

Golf a PSK31 modulator

Given a string of ASCII text as input, encode it in BPSK31 using Varicode. You may either output an audio file in any common format, or play the audio over the device speakers. You may output at any ...
• 1,620
2 votes
0 answers
99 views

Tips for golfing in Thue

Anyone got tips for golfing in Thue. One tip per answer, and no tips aplicable to all languages (like remove comments)
• 2,095
2 votes
0 answers
282 views

Shorten this dns txt record request script as much as possible

I have made a short script that will pull dns txt records down from a server and combine them into a single string. DNS txt records are: 1.website.com ...
• 129
2 votes
0 answers
102 views

Tips for golfing in Fennel

Fennel is a lispy language which compiles to Lua. From its page: Fennel is a programming language that brings together the speed, simplicity, and reach of Lua with the flexibility of a lisp syntax ...
• 1,655
2 votes
0 answers
117 views

Smallest OCI Container That Handles PID 1 Signals Correctly

Introduction There have been a few examples of the smallest possible OCI container that does "X". However these examples never correctly handle termination signals. Challenge Produce the ...
1 vote
0 answers
307 views

FreeCell stack moving

This question is about moving stacks around in the card game FreeCell, but here it will be presented more abstractly. Given three integers $0\le n,m<10000,0<k<10000$. There are $m+2$ ...
• 25.6k
0 votes
0 answers
164 views

Shortest Float32Array to Int32Array conversion for audio processing

I'm currently converting a Float32Array to an Int32Array for input to a real-time audio raw PCM to MP3 recording application. <...
• 209