Unanswered Questions

78 questions with no upvoted or accepted answers
24
votes
0answers
708 views

Halting Problem for Simplified Hexagony

Introduction Decide whether a Hexagony program composed solely of the characters .)_|\/><@ will halt using least bytes. Challenge Hexagony is a language ...
23
votes
0answers
708 views

Auto BATCH golfer

I love BATCH, despite its shocking lack of functional commands, despite even due to its lack of non-integer support. Why? Because this works: SET var=SET %var% i=0 ...
20
votes
0answers
383 views

Matrices Generated Using Rectangles

Input is an r by c matrix of non-negative integers (you may input r and c as other parameters if this helps with golf). This may be inputted as a 2D array or, if you prefer, a 1D array (though taking ...
20
votes
0answers
472 views

Maximal discrepancy-2 sequence with minimal entropy

Background As noted in the PPCG challenge Compress a maximal discrepancy-2 sequence – which inspired this challenge – the authors of the paper Computer-Aided Proof of Erdős Discrepancy Properties ...
19
votes
0answers
412 views

Optimize Compiler for simple Reverse Polish Notation Programming Language

Description Imaginary programming language (IPL) uses Polish Reverse Notation. It has the following commands: i -- input number and push it to the stack o -- non-destructive output top of the stack ...
18
votes
0answers
833 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: ...
16
votes
0answers
486 views

Determine if a Graph is Toroidal

A simple graph is toroidal if it can be drawn on the surface of a torus without any edges intersecting. Your task is to take a simple undirected graph via any reasonable method (adjacency matrix, ...
15
votes
0answers
472 views

Expand Sine and Cosine

Trigonometry has LOTS of identities. So many that you can expand most functions into sines and cosines of a few values. The task here is to do that in the fewest bytes possible. Identity list Well, ...
13
votes
1answer
1k views

Golf a number bigger than Loader's number

As a follow up to Shortest terminating program whose output size exceeds Graham's number and Golf a number bigger than TREE(3), I present a new challenge. Loader's number is a very large number, ...
12
votes
0answers
413 views

How to reduce EXE size of x86 ASM compiled with FASM?

As an exercise, I've created a simple solution for this challenge, in x86 Assembly Language. I'm running this with FASM on Windows. Here's my source code: ...
12
votes
0answers
1k views

Tetris Tangrams

Introduction Tangrams are a classic puzzle involving arranging/fitting blocks into various shapes. From the Chinese 七巧板 - literally meaning "seven boards of skill". Let's take this idea and use the ...
11
votes
0answers
437 views

Complement of a Regex

For the purposes of this challenge, we define a postfix regex dialect with alphabet {1, 0} and the following operations: 1 and <...
11
votes
0answers
590 views

Golf an unbeatable chopsticks bot

From Wikipedia: Chopsticks is a hand game for two players, in which players extend a number of fingers from each hand and transfer those scores by taking turns to tap one hand against another. In ...
11
votes
0answers
292 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 ...
11
votes
0answers
387 views

Hexasweep (part 1): The Solver

(This is part 1 in a two-part challenge.) Your task is to solve a Hexasweep puzzle. A Hexasweep puzzle is set out on a grid of diamonds arranged in hexagonal shapes, of which the board looks like a ...

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