All Questions
74
questions with no upvoted or accepted answers
41
votes
0
answers
2k
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 [...] ...
- 8,659
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. ...
- 41.3k
18
votes
0
answers
605
views
Play Thud! (Dwarf Edition)
Key links:
Troll question
Chat room
Game
Controller Interface
Dwarf league table
...
- 11.8k
17
votes
0
answers
748
views
How to golf string output in Chef
I'm attempting to solve a programming golf style programming puzzle. I need to write an 18 character phrase in Chef in less than 32 "lines" of code. In this case, a line counts as an ingredient or an ...
- 279
15
votes
0
answers
555
views
Play Thud! (Troll Edition)
Key Links
Dwarf question
Chat room
Game
Controller Interface
Troll league table
...
- 11.8k
13
votes
0
answers
471
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 ...
- 2,037
12
votes
0
answers
437
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 ...
- 12.6k
12
votes
0
answers
671
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 ...
- 2,481
12
votes
0
answers
509
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. ...
- 49.4k
11
votes
0
answers
653
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 ...
- 1,178
11
votes
0
answers
218
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 ...
- 73.8k
11
votes
0
answers
459
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 ...
- 331
11
votes
0
answers
913
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 ...
- 6,762
10
votes
0
answers
205
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 ...
- 20.3k
10
votes
0
answers
436
views
Jelly compression quine
The golfing language Jelly has a very complex and clever string compression system which I'm not going to go into depth about here. You can find a very good explanation here.
Basically, Jelly's string ...
- 35.6k
10
votes
0
answers
262
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 ...
- 513
10
votes
0
answers
594
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 ...
- 3,606
9
votes
0
answers
272
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 ...
- 3,085
9
votes
0
answers
372
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 ...
9
votes
0
answers
389
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 ...
- 49.4k
9
votes
0
answers
262
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 ...
- 191
9
votes
0
answers
462
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 ...
- 9,881
8
votes
0
answers
405
views
Turing Machine that outputs pi
Turing Machine Preliminaries
A Turing machine is specified by the following data
A finite set of symbols S = \$\{s_1,s_2,...\}\$
A finite set of states M = \$\{m_1,m_2,...\}\$
A partially defined ...
- 181
8
votes
0
answers
531
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 ...
- 2,481
8
votes
0
answers
470
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 ...
- 1,232
7
votes
0
answers
212
views
Find the linear transformation
Given a set of bit vectors \$A\$ and a binary matrix \$M\$, we can define the set \$MA = \{ Mx : x \in A \}\$, where \$ M x \$ is the result of the matrix multiplication of \$ M \$ by \$ x \$ over \$\...
- 9,682
7
votes
0
answers
325
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 ...
- 169
7
votes
0
answers
377
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
245
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 ...
- 2,723
6
votes
0
answers
241
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:
...
- 161
6
votes
0
answers
251
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 ...
- 221
6
votes
0
answers
195
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 ...
- 221
6
votes
0
answers
305
views
Crazyhouse chess KoTH
What is Crazyhouse Chess?
Crazyhouse Chess is a chess variant that is basically normal chess except you can place a piece you previously captured back on the board instead of a regular turn.
Bot ...
user118390
6
votes
0
answers
317
views
Minimum cost of solving the Eni-Puzzle
You're tasked with writing an algorithm to efficiently estimate cost of solving an Eni-Puzzle from a scrambled state as follows:
You're given m lists of containing n elements each(representing the ...
6
votes
1
answer
394
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 ...
- 7,149
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 ...
- 421
5
votes
0
answers
238
views
Find the best character arrangement
You want to write your English essay. However, all characters on your keyboard broke other than the arrow keys and the enter key. You want to find out how to place the characters so you can write your ...
- 9,682
5
votes
0
answers
406
views
Hamming distance traveling salesman problem
The Hamming distance between two strings is the number of positions they differ at.
You are given a set of binary strings. The task is to find the length of the shortest route that visits all of them ...
- 8,415
5
votes
0
answers
263
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 ...
- 659
5
votes
0
answers
225
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 ...
- 659
5
votes
0
answers
367
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
292
views
Tips for golfing in TeaScript
TeaScript is a powerful JavaScript golfing language created by StackExchange, PPCG, user Downgoat. TeaScript compiles to JavaScript and contains many helpful features for golfing
This question is to ...
5
votes
0
answers
359
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
747
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
267
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 ...
- 507
4
votes
0
answers
210
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 ...
- 5,045
4
votes
0
answers
157
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 ...
- 5,045
4
votes
0
answers
282
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 ...
- 1,628
4
votes
0
answers
240
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
...
- 2,344
3
votes
0
answers
193
views
Custom Games of Life
There's a lot of questions about Conway's Game of Life, but nothing about customization (Related: 2-Player Life). Given an input, determine the result on a 100x100 grid after some iterations. The ...
- 561