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2
votes
0answers
142 views

What's so great about 1729? [closed]

This is not a duplicate of this question. This is asking for the nth number that can be represented as the sum of two cubes in two different ways, while that is asking for the n-th number that can be ...
14
votes
4answers
637 views

Actually Integer Metagolf

Background Actually (the successor to Seriously) is a stack-based imperative golfing language I created in November of 2015. Like many other golfing languages, it has one-byte commands that perform ...
13
votes
8answers
557 views

Find a maximal rectangle of 1s

Background I want to buy an plot of land and build my house on it. My house should be rectangular, and as large as possible; however, the available plots have lots of rocky areas that I cannot build ...
19
votes
4answers
395 views

“Finish work” as early as possible

Background Imagine for a moment that you have a mind-numbingly boring job. Every morning, you are given a collection of tasks that you should work on that day. Each task has a certain duration, and ...
12
votes
4answers
306 views

Choose Scenes for a Movie

Introduction Finally the movie company is financing your film. They have given you a maximum budget and they also set the running time of your movie. Now you can start with the pre-production. You ...
29
votes
4answers
454 views

Plurality Voting with Cellular Automata

There's a really important problem in cellular automata called the Majority problem: The majority problem, or density classification task is the problem of finding one-dimensional cellular ...
132
votes
98answers
12k views

What is the smallest positive base 10 integer that can be printed by a program shorter (in characters) than itself?

I think the question as above is clear, but just in case: Write a full program (not just a function) which prints a positive base 10 integer, optionally followed by a single newline. Qualifying ...
16
votes
2answers
320 views

Playing Billiards

In this code golf, you will have to determine the direction of the shortest shot that hits exactly n cushions before falling into a pocket. The billiard table is a 6 pocket pool table with the ...
1
vote
0answers
93 views

Robot optimization

Your task is to program a robot so that it reaches the hole in the ground on each of the maps within reasonable time. If the robot reaches the hole, it falls down into it and thus victory is assured, ...
4
votes
0answers
167 views

Finding the smallest grid of squares [closed]

Inspiration from Puzzling.SE. Suppose we have an m × n grid such that each element is a base 10 digit. We can read the numbers from such a grid so that we fix a starting element, go to one of the ...
13
votes
3answers
689 views

An optimization challenge with strange coins

You have n coins which each weigh either -1 or 1. Each is labelled from 0 to n-1 so you can tell the coins apart. You have one (magic) weighing device as well. At the first turn you can put as many ...
11
votes
1answer
429 views

An optimization version of the Hadamard problem

First, some definitions. A Hadamard matrix is a square matrix whose entries are either +1 or −1 and whose rows are mutually orthogonal. The Hadamard conjecture proposes that a Hadamard matrix of ...
11
votes
4answers
360 views

Approximate Square Formation

Background I have a bunch of square-shaped boxes of equal size, and since I'm a neat person, I want to arrange them all into a square formation. However, their number is not necessarily a perfect ...
16
votes
4answers
450 views

Find the largest independent set in a high-dimensional lattice-like graph

For a given positive integer n, consider all binary strings of length 2n-1. For a given string S, let L be an array of length n which contains the count of the number of 1s in each substring of ...
12
votes
2answers
286 views

Creasing for Loot

Introduction After a long battle, you have managed to defeat a Sphinx in a contest of riddles. The Sphinx, impressed with your skill, wishes to give you a reward commensurate with your cleverness, ...
30
votes
2answers
2k views

Shortest universal maze exit string

A maze on an N by N grid of square cells is defined by specifying whether each edge is a wall or not a wall. All outer edges are walls. One cell is defined as the start, and one cell is defined as the ...
13
votes
6answers
978 views

A determinant optimization challenge

Consider 30 by 30 Toeplitz matrices all of whose entries are 0 or 1. This challenge is a simple optimization challenge to find the matrix with the largest determinant possible. Input None Output A ...
26
votes
8answers
1k views

Uniquely separated pixels

For an N by N image, find a set of pixels such that no separation distance is present more than once. That is, if two pixels are separated by a distance d, then they are the only two pixels that are ...
3
votes
1answer
228 views

Minimum of a Polynomial in Python

What is the shortest amount of code that can find the minimum of an inputted polynomial? I realize that you can import packages like Numpy and others, but using only user defined functions, what is ...
18
votes
7answers
614 views

Optimize the Scralphabet

Scralphabet A normal bag of Scrabble tiles contains the following letters (? is a blank tile, which can stand for any other letter): ...
-2
votes
4answers
237 views

Write a program that takes as close to 1 second sharp to execute in your language [closed]

Write a program that takes as close to 1 second Wall-time sharp to execute in your language. Anything goes except to have the processor sleep / pause / wait, by either internal or relying on external ...
13
votes
4answers
613 views

Build a minimum-clue Sudoku unsolver

My attempt at stating this question, but with a more objective solving criterion. Your task is to build a program or function that takes a solved Sudoku grid S in the format of your choice and ...
14
votes
2answers
634 views

Build a top-front-side puzzle solver

A top-front-side puzzle is a puzzle where you are required to construct a 3-D shape of (usually cubic) blocks given three orthogonal views: a top view, a front view, and a side view. For example, ...
6
votes
2answers
404 views

Implement multiplication by a constant with addition and bit shifts

While looking at the ARM instruction set, you notice that the ADD instruction has the so-called "Flexible second operand", which can be abused for quick multiplication. For example, the following ...
8
votes
0answers
496 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 ...
4
votes
7answers
457 views

Fastest array-by-array nearest neighbour search

Intro - Nearest neighbour comparison between two arrays is something that can be done very efficiently when only 1 variable per array is involved, because it can be done by sorting and then performing ...
46
votes
7answers
7k views

Is this even a word?

Your should write a program or function that takes a 4-character string as input and outputs a value indicating if the string is an English word or not. You are allowed to make mistakes in 15% of the ...
14
votes
2answers
879 views

Go and make it starry

In this contest you have to write a program, that accepts a black and white pixel image, and tries to alter it, such that the white shape forms star domain, with as few changes as possible. Allowed ...
1
vote
0answers
222 views

0h h1: Logical optimization [closed]

I've written a recursive backtracking solver for the game 0h h1. It's a simple game that takes place on a square grid, and each cell can be empty, red, or blue. You are given an initial configuration, ...
6
votes
1answer
325 views

Crafting Canonically Cöcher Crosswords

The Setup Most of us are familiar with crossword numbering, which follows three basic rules: in a character grid consisting of blacks and whites (see below), any maximal contiguous horizontal or ...
11
votes
4answers
1k views

5 Seconds to Find Pie

Pi times e (or Pie if you like ambiguous notation) to 100 decimal places is: 8.5397342226735670654635508695465744950348885357651149618796011301792286111573308075725638697104739439... (OIES A019609) ...
11
votes
1answer
612 views

Frogger Champion

The Game Most of us know about Frogger, the 80's era arcade game where the objective is to hop a frog safely across a busy highway and a hazard-filled pond to arrive safely at home. A challenge was ...
8
votes
3answers
969 views

Restricted memory optimization

The edit (or Levenshtein) distance between two strings is the minimal number of single character insertions, deletions and substitutions needed to transform one string into the other. If the two ...
28
votes
1answer
1k views

Domino Circuits

Scoreboard Here are the raw scores (i.e. domino counts) for VisualMelon's submission. I'll turn these into the normalised scores described below, when more answers come in. The existing solution can ...
-1
votes
2answers
273 views

Shortest test for primality for byte [duplicate]

Write a function which gets as input a number (0 <= n <= 255) stored in 32-bit variable and returns non-zero integer if n is prime number and 0 otherwise. Considern = 0 and n = 1 as non-primes. ...
18
votes
2answers
2k views

Mastermind strategy

I could only find code-golf challenges for Mastermind, so here's a code-challenge version that I would have liked to take on myself. An optimal strategy for the normal Mastermind game, MM(4,6), was ...
15
votes
4answers
924 views

Travelling Salesman

You are given, as a list or vector or whatever, a bunch of 3-tuples or whatever, where the first two things are strings, and the third thing is a number. The strings are cities, and the number is the ...
2
votes
3answers
2k views

Check If Two or More Variables Are All Equal to Zero in JavaScript

What is the shortest way to check if two or more variables are equal to 0 in JavaScript? I'm curious to know if there's something shorter than if(!x&&!y&&!z){...}.
3
votes
2answers
569 views

Saying a number in the shortest way

A string of digits (positive integer) can be converted to plain English in various ways. For instance, 115 can be read as "hundredfifteen", "oneonefive", "elevenfive", "twoonesfive". So question's ...
7
votes
4answers
474 views

Build a drug testing scheduler

In this problem on Puzzling.SE, I ask a question about determining the amounts of drug to use in a clinical test to minimize total drug usage and fulfill the requirements of the testing procedure. ...
4
votes
0answers
112 views

Using dictionaries, thesauruses, and similar databases, construct as large of a “See also” loop as possible [closed]

As I'm sure many of you know, synonyms can range from very similar to not-so-similar-but-I-can-see-how-it's-similar. It's common for dictionaries to use "See also" to denote occurrences of words that ...
44
votes
1answer
1k views

Minimal keystrokes needed to type a given text

We all know that programmers tend to be lazy. In order to maximize your free time, you decide to write a program that outputs a minimal number of keystrokes for text fed into it. Input: Text that ...
7
votes
2answers
734 views

Build a program that creates a minimal one-ohm resistor diagram for a given resistance

You are a contractor for a company who designs electrical circuits for the various products they make. One day, the company accidentally gets a huge shipment of one-ohm resistors and absolutely ...
10
votes
2answers
855 views

Implement superoptimizer for addition

The task is to write code that can find small logical formulae for sums of bits. The overall challenge is for your code to find the smallest possible propositional logical formula to check if the sum ...
6
votes
3answers
718 views

Who brings the croissants?

This question is inspired by a similar question first asked on StackOverflow by Florian Margaine, then asked in variant forms on CS by Gilles and on Programmers by GlenH7. This time, it's a code golf,...
-2
votes
1answer
140 views

meeting point minimizing travel distance for participants? [closed]

The problem is to find the point minimizing the travel distance for around 100 persons in different regions who want to meet in the same place. Travel is by car not by plane. Assuming that I get ...
13
votes
0answers
697 views

Shortest 2-Player Game of Halma

In Chess, it's possible for the game to end after 4 moves (2 each) with a Fool's Mate. Your goal is to find the Fool's Mate of Halma: the 2-player game of Halma that minimises the number of turns ...
16
votes
2answers
1k views

Compact a Befunge program

Befunge is a 2-dimensional esoteric programming language. The basic idea is that (one-character) commands are placed on a 2-dimensional grid. Control flow walks across the grid, executing commands it ...
2
votes
1answer
226 views

Bob's Financial Planning (Maximize)

Bob's Financial Planning Bob lives in Pecunia. It is a small island city completely governed by the Pecunia City Council (PCC). PCC has decided to encourage foreign investments in the city by waiving ...
11
votes
4answers
2k views

Program my microwave oven

I'm very lazy so I try to always program my microwave with the fewest possible button presses. My microwave has the following buttons: A "minute plus" button which may only be pressed first and ...