Questions tagged [code-golf]
Code-golf is a competition to solve a particular problem in the fewest bytes of source code.
10,103
questions
7
votes
3answers
65 views
Is this an L-shape?
Background
An L-shape is defined as a polyomino which can be made by extending two rectangular legs in orthogonal directions from a full square (called a pivot). The size of the square should be at ...
7
votes
6answers
158 views
Coordinate Connecting
Input:
Ten unique integer coordinates, between (0,0) and (100,100).
Output:
The coordinates arranged in the order/an order such ...
11
votes
22answers
636 views
Implement a zipwith function
zipwith is a functional construct that takes three arguments: one binary function and two lists of the same length, and returns a single list where each element is ...
28
votes
16answers
4k views
Is it a lobster number?
Introduction
A "lobster number", by my own designation, is a number that contains within itself all of its prime factors. The "lobster" description was inspired by the recent ...
9
votes
0answers
133 views
8 out of 10 programmers like countdown [duplicate]
Edit (Jan 24/2021): The original specification for the challenge had a few problems. Underneath the original text, I have added alternate conditions that were suggested by @caird-coinheringaahing (...
16
votes
18answers
2k views
Print a 3D shape
Write a program or a function to print the following cube (if you allow me to call it so) in different sizes:
...
11
votes
5answers
358 views
Approx how many search results
When one performs a search query using Google, one of the first things you see is an approximation of how many results were found. Today, you'll be simulating this in as few bytes as possible.
Input
A ...
11
votes
14answers
936 views
Merge Two Paragraphs with Removing Duplicated Lines
Challenge
The goal of this challenge is to make a function that takes two paragraphs and output a concatenated result with removing the duplicated overlapped lines due to redundancy (but a single copy ...
11
votes
3answers
328 views
A graph and its seven closures
Background
A little while ago, someone posted an interesting puzzle on Math.SE:
What is the smallest digraph (directed graph) G where the following eight graphs are all distinct:
G, the original ...
32
votes
26answers
6k views
Speed of Lobsters
From the subreddit r/SpeedOfLobsters:
Edit the text of an image to create a new phrase
This meme format/style is pretty self-explanatory. Simply have a browse through the subreddit if you need more ...
-1
votes
0answers
85 views
The Changing Quine [duplicate]
the goal here is to make a proper quine that outputs its source code and changes the source code to another quine that does the same thing.
after some runs, which doesn't have to be two, the source ...
21
votes
34answers
2k views
Print a conversion table for (un)signed bytes
Your task: Print or return a conversion table with every byte from 00 to ff's value as an unsigned integer, to its value as a ...
41
votes
11answers
5k views
The first published picture of the Mandelbrot set
Hereās the picture of the first published picture of the Mandelbrot set.
Use the fewest bytes possible to write a program or function that outputs the following.
A trailing new line is permitted. ...
17
votes
13answers
3k views
Landau logarithm
Related: Landau's function (OEIS A000793)
Background
Landau's function \$g(n)\$ is defined as the largest order of permutation of \$n\$ elements, which is equal to \$\max(\operatorname{lcm}(a_1,a_2,\...
2
votes
0answers
105 views
Compute the minimal and maximal subset of a set of sets [closed]
Let S be a set of sets, for example S = {{A},{B},{A,B}}. A maximal subset, Max, is an element of S such that no other set in S ...
7
votes
5answers
599 views
Does this JavaScript function support keyword arguments?
JavaScript has no direct support for keyword arguments, but it supports argument object destructuring. It is standard to use a destructed final argument for keyword arguments. Here is an example:
<...
14
votes
8answers
2k views
Is my triangle on the lattice?
Write a program or function which takes three positive integers \$a, b, c\$ and returns/outputs one value if there is, and a different value if there isn't, a triangle on the square lattice, whose ...
3
votes
0answers
333 views
Solve a Cubic Equation [closed]
Input
Your program will take in the integer coefficients of the equation \$ax^3+bx^2+cx+d=0\$ as inputs (a, b, c, and d).
Output
All real solutions of the input equation, with an accuracy of at ...
9
votes
1answer
273 views
Win a KQ vs K endgame
Win a K vs KQ endgame
Summary
The goal of this challenge is to create a program or function which will win a Chess game with a King and Queen against a lone King. The user will specify three squares, ...
20
votes
5answers
729 views
The Caged Circles
This problem will have you analyzing circles drawn on the grid, with the gridlines drawn at integer values of \$x\$ and \$y\$.
Let \$\varepsilon\$ be a very small number (think, \$\varepsilon = 0.0001\...
8
votes
3answers
493 views
Validating a Battleship board
Do you know the game Battleship? Well, I want to play with my little brother, but before we can begin we need to set up our ships on the board. This is your input.
Now, we need to check that the ships ...
3
votes
2answers
346 views
Minimal Pairing
Your program should take two lists, where each entry (a positive integer) represents the number of members of some group, as input. These lists will have the same sum but may have different lengths.
...
18
votes
14answers
662 views
Sub-string Extractor with Specific Keywords
Challenge
The goal of this challenge is to make a function that takes an input string, a start keyword and a end keyword. The output extracted result is from (but excluded) the given start keyword to (...
21
votes
19answers
3k views
Draw an ASCII hexagon of side length n
Given a positive integer \$n\$ output an ASCII hexagon with diagonal side length \$n\$, as pictured (note there are \$2n\$ _ characters on the top edge)
Examples:
\$...
27
votes
10answers
2k views
Help Stack Exchange transpose tables
Stack Exchange doesn't know how to transpose tables. Let's help.
Given a markdown table, transpose it.
Input assumptions:
There will be at least two rows (including header) and two columns
Either all ...
13
votes
20answers
1k views
Linear integer function generator
Inspired by a recent challenge involving Fibonacci numbers in which OEIS was mentioned, I would like to present a challenge of creating a function that generates a wide array of different linear ...
22
votes
18answers
972 views
Interpret Interval Notation
Interval notation is a way to write complicated range bounds more conveniently and concisely than writing an inequality. The challenge, should you choose to accept it, is to write a program or ...
18
votes
5answers
1k views
Find a sequence in the binary digits of Ļ
Given a binary sequence of finite length, find the starting position where this sequence first appears in the binary digits of Ļ (after the decimal). You can assume that an answer exists for any input ...
11
votes
5answers
566 views
Ellipsoid surface area
Related: Ellipse circumference
Introduction
An ellipsoid (Wikipedia / MathWorld) is a 3D object analogous to an ellipse on 2D. Its shape is defined by three principal semi-axes \$a,b,c\$:
$$ \frac{x^2}...
24
votes
13answers
4k views
How long till Halley's Comet returns?
Halley's Comet is the only comet that may appear (i.e. become visible to the naked eye on Earth) twice in a human lifetime. The orbital period of Halley's Comet is not constant: it has varied between ...
13
votes
11answers
1k views
Golfing Advent of Code 2020, Day 3
I thought it'd be interesting to turn AoC day 3 puzzle into a Golfing Challenge, so here it is.
Task
Find the number of # you'd encounter in an 11x11 grid (...
17
votes
18answers
2k views
Vandalizing Marquees
A marquee is a low-tech board that allows customizable letters. For example, here is a marquee:
SALE ON SNEAKERS
However, someone might come along and vandalize it ...
8
votes
13answers
394 views
Von Neumann Neighborhood
Your goal is to make a function that takes the coordinates of a cell in 2D space and a distance \$r\$ and returns the coordinates of all cells in the input coordinate's von Neumann neighborhood of ...
6
votes
15answers
789 views
Prime generating function
Background
The Python code
((((((((n%35)^11)*195)|53)&181)+n)%168)*n)+83
produces 74 distinct primes for \$0 \le n \le 73\$. This code also works in Java. The ...
23
votes
14answers
2k views
Pascal's Fibonacci Triangle
What do you get when you cross Pascal's Triangle and the Fibonacci sequence? Well, that's what you have to find out!
Task
Create a triangle that looks like this:
...
20
votes
27answers
974 views
Partial sums of the Kempner series
The Kempner series is a series that sums the inverse of all positive integers that don't contain a "9" in their base-10 representations (i.e., \$\frac{1}{1} + \frac{1}{2} + \frac{1}{3} + .. +...
23
votes
12answers
1k views
Bedevil your hangman opponent
Task
You are playing Hangman, and your opponent uses a simple but effective strategy: Each turn, from the remaining letters, they guess the letter that appears most frequently across all possible ...
16
votes
14answers
1k views
Split a number in every way possible way within a threshold
Task
Given a positive integer number and a threshold, split into every possible way without generating any numbers above the threshold.
Examples
Input: 15008
Threshold: 400
Valid Output:
...
2
votes
1answer
136 views
Twist on words to numbers [closed]
The Goal
The goal of this question is to put a twist on this question. Your answer should be able to convert an array of words associated with integers into those integers. As an extra challenge, ...
30
votes
2answers
1k views
Golf the smallest sphere!
Inspired by this challenge, as well as a problem I've been working on
Problem:
Given a non-empty set of points in 3D space, find the diameter of the smallest sphere ...
13
votes
7answers
619 views
Generalised Taxicab Numbers
\$\newcommand{T}[1]{\text{Ta}(#1)} \newcommand{Ta}[3]{\text{Ta}_{#2}^{#3}(#1)} \T n\$ is a function which returns the smallest positive integer which can be expressed as the sum of 2 positive integer ...
asked Dec 28 '20 at 20:33
caird coinheringaahing
22.6k5 gold badges53 silver badges160 bronze badges
24
votes
25answers
2k views
Based Palindromes
A palindromic number, as a refresher, is any number which reads the same forward as backwards. However, what about palindromes in other bases?
Input
Any integer b ...
17
votes
16answers
5k views
I don't like curry
I don't like curry. Help me reverse the effects of this evil question - Make me some curry - by uncurrying functions.
Task
Given a blackbox curried function, output its uncurried equivalent.
The ...
23
votes
2answers
1k views
Eye test - How many squares are in this picture?
The picture:
Sick of the same old grid where the answer is simply a square pyramidal number?
Accept the challenge and write a program that given a positive integer \$n\$ counts how many squares are ...
11
votes
17answers
1k views
Polynomial Laplace transform
This is a repost of this challenge, intended to revamp it for looser I/O formats and updated rules
You are to write a program which takes an integer polynomial in \$t\$ as input and outputs the ...
asked Dec 25 '20 at 22:55
caird coinheringaahing
22.6k5 gold badges53 silver badges160 bronze badges
6
votes
3answers
335 views
Golf me a polygonal loader
Codidact post, CGCC Sandbox, Codidact Sandbox
Given three positive integers as input, animate an ascii-art polygonal loading symbol on the screen.
Intro
You will be given three inputs, \$n\$, \$l\$, ...
4
votes
5answers
177 views
Strobogrammatic Numbers [duplicate]
Strobogrammatic Numbers
Definition
A number which is rotationally symmetrical, i.e., it'll appear the same when rotated by 180 deg in the plane of your screen. The following figure illustrates it ...
27
votes
37answers
2k views
Jelly's Untruth
Jelly has an "untruth" atom: į¹¬. This takes a non-empty array of positive integers and returns a Boolean array with 1s at the indexes in the input. For ...
13
votes
8answers
1k views
How Many Atoms?
How Many Atoms?
Write the shortest code that when given a chemical formula as input, outputs the total number of atoms in the formula.
Input
A chemical formula in any reasonable format. Each chemical ...
37
votes
31answers
4k views
Find the “Bittiest” Number [closed]
The Challenge
Given a list of integers, the "bittiest" number among them is the one with the most bits on - that is, the largest amount of bits set to 1.
Write a function (or a program) that ...
