Questions tagged [code-golf]
Code-golf is a competition to solve a particular problem in the fewest bytes of source code.
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Qat Equation Solver
Qat is a tool that lets you search for words matching a given pattern, often used by crossword and other word puzzle writers and solvers.
In this challenge, you will have to implement a specific part ...
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On The Subject Of Simon Says
This challenge is from a game, Keep Talking And Nobody Explodes.
This is like one of those toys you played with as a kid where you have to match the
pattern that appears, except this one is a knockoff ...
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Detect sonar imposters
You are the sonar captain aboard an underwater submarine. The way sonar works is that every submarine sends out a ping at regular intervals. Each interval is a whole number of seconds. Each submarine ...
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Draw the GKMS aperiodic tile
Chaim Goodman-Strauss, Craig Kaplan, Joseph Myers and David Smith found the following simple (both objectively and subjectively) polygon that tiles the plane, but only aperiodically:
Indeed they ...
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Is it a Frog List?
Challenge:
A Frog List is defined by certain rules:
Each frog within a Frog List has an unique positive digit [1-9] as id (any 0...
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A randomly colored walk
Given two inputs, a distance \$d\$ and a number \$n\$ output a list of \$n\$ random colors which each have distance \$d\$ from the previous.
Background
A random walk is a path which is defined by ...
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Do absolutely nothing [closed]
Write a program that has at least one byte that, when run, does absolutely nothing.
I thought this would be done by now, but I can't find any other challenges like this.
How to tell if it does nothing:...
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Shortening this Code to process nested tuple even further without the use of max()
I have the code:
...
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Great Leap to the Right
Given a string s consisting of characters a-z lowercase, generate 5 arrays a1, a2, ...
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Implement the `<=>` three-way comparison operator on numbers
In C++, there exists a a <=> b three-way comparison operator that, for numerical types, does the following:
If a < b, ...
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Is there any less code way to make a leaf (eye) shape in CSS?
I'm trying to solve a CSS challenge. It contains a rotated leaf shape (looks like an eye). Score for the challenge depends on amount of characters of the code. Here's my way to make a leaf shape:
<...
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We're gonna need a bigger podium!
If \$R\$ runners were to run a race, in how many orders could they finish such that exactly \$T\$ runners tie?
Challenge
Given a positive integer \$R\$ and a non-negative integer \$0\leq T\leq {R}\$ ...
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How long to carry sort?
Carry sort is an \$O(n)\$ "sorting" algorithm. Here's how it works. The algorithm moves left to right along a list. As it traverses a list it "carries" a single item, the largest ...
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Is it a valid chemical?
Non-metals typically* have a fixed number of covalent bonds in every chemical they are part of. Given the number of bonds every element requires, output whether it's possible to construct a single ...
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Is it traversable?
Imagine that a list of integers describes the heights of some two-dimensional terrain as seen from the side.
Stamina: [ 4 4 4 4 4 4 3 3 3 3 2 2 2 - ]
O
...
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Mapping Passing Through Point
(Inspired by this challenge.)
Given six real values in three pairs: \$(x_1, x_2), (y_1, y_2),\$ and \$(x_0, y_0)\$, where \$x_1 < x_0 < x_2\$ and \$y_1 < y_0 < y_2\$, create a function ...
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Guess The Array
Problem author: https://stats.ioinformatics.org/people/5815
You are given a system with a hidden permutation of the numbers \$1, 2, 3, \ldots, n\$. Your task is to guess this permutation by asking the ...
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Ragged list pattern matching, Part 2
This is a sequel to Ragged list pattern matching. In this challenge, the wildcard may match a sequence of items of any length instead of just a single item.
Given a pattern and a ragged list of ...
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Detect round trips on a hyperbolic grid
You're driving a car in an infinite city whose blocks are pentagons arranged in the order-4 pentagonal tiling. At each step, you proceed to the next intersection and choose whether to continue left, ...
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Language Word Checker
Develop a program to check if a given word is part of a language defined by the following rules:
The language has a set of rules.
The empty string is considered a valid word in the language.
Two ...
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Guessing on straws
Dedicated to Martin Gardner, taken from his book
Background
In the old days, the Slavs had a divination method for finding out whether a girl would get married. The girl would clutch six straws in her ...
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Sophie Safe primes
Description
Write a program or function that takes in a positive integer \$n\$ as input and outputs all Sophie Germain primes that are safe primes less than or equal to \$n\$. A prime number \$p\$ is ...
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"Sort" by element duplication
Inspired by one of many bugs I ran into while implementing selection sort in trilangle.
Given a non-empty list of non-negative integers, "sort" the list using the following procedure:
Find ...
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Bringing Down the Building
We are going to bring down an imaginary building with a series of explosions. Our building is a 5x5 matrix of integers ranging 1-9, each representing a single brick.
The challenge is to set of a ...
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Classify a surface from its fundamental polygon
This question is an extension of Who's that Polygon? to arbitrary numbers of sides.
A fundamental polygon for a surface is an polygon with a prescribed pairing for all its \$2n\$ sides, each ...
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Generate number from given range
Your function must accept three numbers in any order:
A signed real number (or ±Infinity) - The number (N) for which you have ...
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Imtiaz Germain Primes
Description
"Imtiaz Germain primes" is not a technical name in Mathematics, but my weird creation, in the memoir of the famous mathematician Sophie Germain. These primes can be generated by ...
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Counting Letters in a String
Write a program or function that takes in a string and outputs a count of each modern English alphabet letter in the string, case-insensitive.
Input: A string consisting of printable ASCII characters (...
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String with the smallest sum of ASCII values
Description
In this challenge, you need to write a function that takes in a list of strings and returns the smallest string based on their ASCII value. You should assume that the input list contains ...
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Just Friends… in code golf
We already have challenges dealing with simulating vanilla Conway's Game of Life, Wireworld and rule 110, but so far none corresponding to a (specific) non-totalistic rule. So here is one.
In June ...
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Voronoi-Lloyd ASCII art [closed]
Voronoi diagram is a partition of a plane (or part of plane) into regions close to each of a given set of objects ("seeds").
Here we’ll be dealing with discrete arrays or even rather with ...
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Mirror a String in Place
Write a program that takes a string as input and modifies it by reversing the string in its place by mirroring the position. The first position goes to last, second to second last and so it goes on. ...
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Tips for golfing in SVG
SVG is an XML vector graphics markup language embeddable in web content.
Your tips should be at least somewhat specific to SVG.
Please post one tip per answer.
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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 ...
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Largest Binary Area
Take the sequence of all natural numbers in binary, (1, 10, 11, ..) then write them vertically beside each-other like this (least significant bit on top; 0s have ...
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Draw Parcly Taxel's cutie mark
I've been a fan of My Little Pony: Friendship Is Magic for a long time, and very early on I created a pony version of myself also called Parcly Taxel (warning: may be too cute to look at). The symbol ...
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Find the average, median, mode, and range
It's easier to put this into coding terminology, so here we go:
First find the average, median, mode, and range.
Then, put those values in another array, then find the new average, median, mode, and ...
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Canonical form of a cubic Bézier curve
On Pomax's Primer on Bézier Curves this "fairly funky image" appears:
This is related to the fact that every cubic Bézier curve can be put in a "canonical form" by an affine ...
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Encrypt AES256 (ECB Cipher Mode)
I've looked and could not find a post for this, if there is one, I'll remove it quick! Related and also related
The goal is (hopefully) clear: create the shortest code (in bytes) that implements the ...
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Shape Animation
In PowerPoint, there's just one overly used feature: animations. For simplicity, that shape will be a non-rotated rectangle.
The data is specified as an array of eight integers: ...
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Multibase Numbers
(Similar: Through the bases)
Normally, our number system is base ten, with the digits 0123456789. However, we can increase or decrease the base count (so ...
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The number of distinct words in a sentence
Challenge: Find the number of distinct words in a sentence
Your task is to write a program that takes a sentence as input and returns the number of distinct words in it. For this challenge, words are ...
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Sum of strings (UTF-16 codepoints)
Your function must accept two strings and return new string where are UTF-16 code of all symbols is the sum of UTF-16 codes of inputs symbols
If the resulting sum is greater than ...
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Longest Valid Parentheses
Given a string of parentheses ( and ), find the length of the longest substring that forms a valid pair of parentheses.
Valid ...
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Generate a permutation from the high-water marks
Given a permutation, we can define its high-water marks as the indices in which its cumulative maximum increases, or, equivalently, indices with values bigger than all previous values.
For example, ...
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Shortest code to generate all Pythagorean triples up to a given limit
Generate the shortest possible code in any programming language that can generate all Pythagorean triples with all values not exceeding a given integer limit. A Pythagorean triple is a set of three ...
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Number to Binary
It seems we've managed to go all this time without a plain vanilla Number-To-Binary challenge! Whilst this will inevitably be only one element in many languages, it should put a few esolangs through ...
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Consolidate a 6-axis 2-dimensional Vector
Typically, when we want to represent a magnitude and direction in 2D space, we use a 2-axis vector. These axes are typically called X and Y:
This isn't always convenient, however. The game BattleTech ...
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Making one shape out of dissections of another
Introduction
One question that I have come across recently is the possibility of dissecting a staircase of height 8 into 3 pieces, and then re-arranging those 3 pieces into a 6 by 6 square.
Namely, is ...
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Shortest Code to Find the Smallest Missing Positive Integer
Description
Given an unsorted array of integers, find the smallest positive integer that does not appear in the array. Your task is to write the shortest code possible to solve this problem.
Input
A ...
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