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28
votes
0answers
2k views

Complement a POSIX Extended Regular Expression

Given a POSIX Extended Regular Expression as input, output its complement (also a POSIX ERE). If the given regular expression matches a string, its complement should not match it, and the regex: ...
25
votes
0answers
652 views

Topologically distinct ways of dissecting a square into rectangles

I was asked by OEIS contributor Andrew Howroyd to post a Code Golf Challenge to extend OEIS sequence A049021. Would be super great to get a couple more terms for [...] A049021. Kind of thing [...] ...
21
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0answers
811 views

Totally Cubular

Create a program or function to unjumble a 9x9x9 cube of digits by rotating individual 3x3 cubes within it. This is similar to (but, I suspect, a bit harder than) my Flippin' Squares question. Input ...
19
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0answers
350 views

Compare Dowker Knotation

Dowker notation is a common way of representing mathematical knots. Dowker notation can be derived from a knot diagram in the following way (based on the description from the wikipedium): We will ...
18
votes
0answers
469 views

Acyclic orientations of an n-dimensional cube

The goal of this challenge is to check and extend the OEIS sequence A334248: Number of distinct acyclic orientations of the edges of an n-dimensional cube. Take an n-dimensional cube (if n=1, this is ...
17
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0answers
323 views

Fix Brain-Flak push-pop redundancy

Brain-Flak is a stack-based esoteric language with eight commands: ...
15
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0answers
278 views

Play Thud! (Dwarf Edition)

Key links: Troll question Chat room Game Controller Interface Dwarf league table ...
14
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0answers
456 views

The knight's next tour

We've all heard of the Knight's Tour puzzle: find a route for a knight that passes through all the squares on a chess board. But let's be honest, it's a little bit boring. So, let's give the knight a ...
13
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0answers
291 views

Play Thud! (Troll Edition)

Key Links Dwarf question Chat room Game Controller Interface Troll league table ...
12
votes
0answers
227 views

Help me prove the Four Color Theorem!

This is not just another challenge asking you to color random maps... In this challenge, you are asked to write a program that is actually used in the formal proof of the Four Color Theorem. First I ...
11
votes
1answer
371 views

Cyclic Polyglot Challenge (Cops)

Cyclic Polyglot Challenge This is the cops thread. You can find the robbers thread here. Cyclic Polyglot A N-element cyclic polyglot is a complete program that can be run in N different languages. ...
11
votes
0answers
875 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. ...
11
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0answers
513 views

Simulate a Game of Quagmire

Background Many moons ago, in a galaxy much like our own, a young BrainSteel attempted to invent a board game. He believed that he, too, could find an amazingly simple set of rules that would generate ...
11
votes
0answers
790 views

Delivery Robots and Destroyer Drones

Program your robots to deliver packages in a warehouse infested with destroyer drones. Avoid the drones and get your packages to the right place as fast as you can. Delivery Robots There are ...
10
votes
0answers
262 views

Golfing Expressions

We can write mathematical expressions using the standard math operators (,),+,...
10
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0answers
513 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 ...
10
votes
0answers
333 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 ...
10
votes
0answers
615 views

Up 12 at 4 it's

Introduction On BBC Radio 2, on Saturdays there's a show hosted by Tony Blackburn called Pick of the Pops. Here, Tony selects a random week from a random year (in the range 1960-1989), and plays the ...
9
votes
0answers
100 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 ...
9
votes
0answers
169 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 ...
9
votes
0answers
347 views

Morpion solitaire

Morpion solitaire This is a game that I remember having learnt from my grandparents in my childhood. Initially I didn't know the name. G B has found it to be Join Five (or less ambiguously - Morpion ...
9
votes
0answers
388 views

Don't break the bridges!

Introduction: You are a worker, who is in charge of managing a set of bridges, connecting a square grid of "nodes": ...
9
votes
1answer
564 views

Fraction Frenzy!

EDIT: I'm getting a lot of comments about this not terminating - I will give the "correct answer" tag to either the first person who gives me FF(3) (as in provides ...
9
votes
0answers
454 views

Total Derangement (Difficulty Level: Hard)

The problem: Write a function which, given a cycle length n and a number of cycles m, where 'm' is within ...
9
votes
0answers
513 views

mini SPICE solver

SPICE is an electrical circuit simulation program originating from UC Berkeley. Your goal is to implement a minimalistic version which can solve for the nodal voltages and branch currents of a circuit ...
9
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0answers
488 views

Chaining autograms

Write a program that takes one integer input n and one format letter and outputs n autograms in the format This sentence contains ? "A"s, ? "B"s ... and ? "Z"s. ...
9
votes
0answers
468 views

Write a FAST word equation solver

This question is similar to Write a word equation solver by David Frank but different in three important ways: (1) David asked for just the first solution found, and I am asking for all the solutions. ...
8
votes
0answers
222 views

Fastest way to iterate over sublattice of discrete lattice

I need to construct a functor that iterates over the linear representation of a sub-lattice of size \$d_x,d_y,d_z,d_q\$ embedded in a lattice of size \$n_x,n_y,n_z,n_q\$. The sub-lattice corner is ...
8
votes
0answers
357 views

Radiation is Painful

A radiation-hardened quine can take a hit and stay standing, but nobody ever said that the quine can't be a wuss about it. For this challenge, you should write a quine that: If no characters are ...
8
votes
0answers
374 views

The N Queens Problem, but with Fairy Chess Pieces

Fairy Chess is a sort of generalized chess that allows unconventional pieces. The eight queens puzzle is a classic problem where you have to put 8 queens on a chess board such that no two queens ...
8
votes
0answers
838 views

Find a dual graph

A dual graph is defined such that for every "face" in a graph G, there is a corresponding vertex in the dual graph, and for every edge on the graph ...
8
votes
0answers
650 views

Encode a steganographic encoder into a package

Introduction By steganography we mean hiding a message along an existing text or image so the result would be unsuspicious of the existence of the original message. This challenge is about hiding ...
8
votes
0answers
593 views

Printing the Cracker Barrel Game

Revised formatting and instructions Given a list of moves for a Cracker Barrel peg board game, or as @Steveverrill stated, Peg Triangle Solitaire: ...
8
votes
0answers
729 views

Generate Loopy puzzles

Loopy is a puzzle game from the collection of Simon Tatham. The previous link contains a javascript implementation of a Loopy puzzle generator. I suggest everybody who wants to attempt this challenge ...
8
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0answers
1k views

Simple chess bot

Inspired by this Implement simple chess bot (with console or GUI) that has following features: [Pseudo-]graphically showing the board; Accepting user moves and making their own moves; Playing by ...
7
votes
0answers
212 views

Leave a wake of dead cells behind you

Conway's Game of Life is a well known cellular automaton "played" on an infinite grid, filled with cells that are either alive or dead. Once given an initial state, the board evolves ...
7
votes
0answers
436 views

Goldbach's Comet

Back to back challenges I guess. Hopefully this one is more clear than the last. Background I was playing around with Goldbach's conjecture, and decided to plot evens (on the x-axis) vs the number ...
7
votes
0answers
409 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 ...
7
votes
0answers
219 views

Find the smallest triangle encompassing the specified polygon

Input: An integer N which represents the polygon's vertices and a list of their x and y coordinates. Expected output: The smallest difference possible between the area of the(not necessarily convex) ...
7
votes
0answers
322 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 ...
7
votes
0answers
175 views

Implement FBLint

(FB, or Functional-Basic, as found here Interpret Functional-Basic) Task Implement a linting program for FB, similar to JSLint for JavaScript. Error types Invalid identifier Identifiers can only ...
7
votes
0answers
282 views

Generate net puzzles

An acyclical grid is a mapping of an acyclical graph (that is, a tree) where each node has no more than four edges onto a toroidal rectangular grid such that each cell of the grid is occupied by a ...
6
votes
0answers
78 views

Chess Squad March

Find the moves that bring a chess squad to a given destination. You control a chess squad consisting of a king and several other pieces, on a larger chess board. Your army is placed so that no piece ...
6
votes
0answers
326 views

What is the simplest reversible circuit that computes conjugacy of transpositions?

Reversible computation refers to computation in which little or no information is deleted. Reversible computation a major component of quantum computation, and reversible computation is potentially ...
6
votes
0answers
188 views

Simulate Alpha Decay

Alpha Decay is a kind of radiation decay where every time the atom "decays", it loses a helium nucleus (an alpha particle). This means that an atom loses 2 protons and 2 neutrons each time. ...
6
votes
1answer
226 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 ...
5
votes
0answers
248 views

Yet another digit insertion problem

Given a positive number \$n\$ we call another (not same as n) positive number \$m\$ good if we insert same digits in both n and m and the resulting fractional value is same. $$m/n = m_{\text{...
5
votes
0answers
272 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 ...
5
votes
0answers
309 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 ...
5
votes
0answers
203 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 ...

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