77 questions with no upvoted or accepted answers
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### 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: ...
604 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 ...
366 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 ...
461 views

### Write a program that checks the consistency of modern mathematics

Modern mathematics has been formalised using set theory by various systems of axioms. Zermelo Frankel set theory with the axiom of choice (ZFC) forms an intuitive set of axioms and is hence most ...
485 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 ...
214 views

### Fix Brain-Flak push-pop redundancy

Brain-Flak is a stack-based esoteric language with eight commands: ...
195 views

### Score a 1 player game of Carcassonne

Carcassonne is a tile-based game, where the objective is to construct Roads, Cities and Monasteries, in order to score points. The game works by players taking turns to draw and place tiles to ...
219 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 ...
530 views

### Please parse this aLL1en language

Background Due to some unfortunate accident during coding you are now teleported and stranded on an alien planet. You really hope that the locals will be helpful and point to the general direction of ...
207 views

### Checkerboard the Matrix

Task Given a matrix, your program/function should output a row-equivalent matrix in checkerboard form ( $A_{ij}=0$ if and only if $i+j$ is odd). Two matrices are defined to be row-equivalent if ...
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### 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 ...
808 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. ...
438 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 ...