Communities

Writing
Writing
Codidact Meta
Codidact Meta
The Great Outdoors
The Great Outdoors
Photography & Video
Photography & Video
Scientific Speculation
Scientific Speculation
Cooking
Cooking
Electrical Engineering
Electrical Engineering
Judaism
Judaism
Languages & Linguistics
Languages & Linguistics
Software Development
Software Development
Mathematics
Mathematics
Christianity
Christianity
Code Golf
Code Golf
Music
Music
Physics
Physics
Linux Systems
Linux Systems
Power Users
Power Users
Tabletop RPGs
Tabletop RPGs
Community Proposals
Community Proposals
tag:snake search within a tag
answers:0 unanswered questions
user:xxxx search by author id
score:0.5 posts with 0.5+ score
"snake oil" exact phrase
votes:4 posts with 4+ votes
created:<1w created < 1 week ago
post_type:xxxx type of post
Search help
Notifications
Mark all as read See all your notifications »
Challenges

Posts tagged code-golf

Code golf is a winning criterion, where users seek to solve the challenge in as few bytes of source code as possible.

This tag doesn't have a detailed wiki yet.

81%
+7 −0
Challenges Word Set Square

Challenge Given a string, e.g. Hello, do the following: Mirror it: Hello -> HelloolleH and create a right triangle using it as the sides: H ee l l l l o...

11 answers  ·  posted 3y ago by Razetime‭  ·  last activity 1y ago by Shaggy‭

Question code-golf ascii-art
50%
+0 −0
50%
+0 −0
Sandbox Mediocre pop count [FINALIZED]

posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

50%
+0 −0
Sandbox Just the vowels please [FINALIZED]

posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

50%
+0 −0
Sandbox Balanced quinary quasiquine [FINALIZED]

posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

71%
+3 −0
Challenges The holeyest base

Given a positive integer as input, indicate which base from 2 to 16 gives the most holes in the representation of the input in that base. The digits used are 0123456789ABCDEF. Note that these incl...

6 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by Razetime‭

Question code-golf base
50%
+0 −0
Sandbox Knight safe squares [FINALIZED]

posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

50%
+0 −0
Sandbox Holeyest base representation [FINALIZED]

posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

50%
+0 −0
92%
+23 −0
Challenges "Hello, World!"

Introduction The classic "Hello, World" challenge. What more can I say? Rules Program takes no input. Program outputs Hello, World! with an optional trailing newline. No other output is accep...

58 answers  ·  posted 3y ago by anna328p‭  ·  last activity 1y ago by __blackjack__‭

66%
+2 −0
Challenges Mark my beacons

Given a grid of numbers, mark the concentric areas around nonzero elements (beacons) decreasing from the value of the beacon till 1. For example, here are some grids with a single beacon: Size 1:...

0 answers  ·  posted 1y ago by Razetime‭  ·  last activity 1y ago by Moshi‭

Question code-golf matrix
60%
+1 −0
50%
+0 −0
Challenges Rationalise recurring binary

Given a potentially recurring binary string, output the number it represents, as a fraction in lowest terms. The notation used in this challenge for recurring digits is non-standard. An r is used ...

0 answers  ·  posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

81%
+7 −0
Challenges Determine whether an integer is square-free

An integer is called square-free if it is not a multiple of a perfect square other than 1. For example, 42 is square-free, but 44 is not because it is a multiple of the perfect square 4 = 2². Your...

13 answers  ·  posted 2y ago by celtschk‭  ·  last activity 1y ago by Shaggy‭

60%
+1 −0
Challenges Chequer checker

A chequer board (also spelt "checker board" in some places) is an 8 by 8 grid of squares alternating between 2 colours. Check whether a provided pattern could be a region of a chequer board. The c...

1 answer  ·  posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

71%
+3 −0
Challenges Presumptuous base conversion

Take an input string representing a number and convert it to decimal (base 10). However, the base of the input is not specified. Assume the input is in the smallest base for which its digits are va...

5 answers  ·  posted 1y ago by trichoplax‭  ·  last activity 1y ago by Shaggy‭

71%
+3 −0
Sandbox Chequer checker [FINALIZED]

posted 1y ago by trichoplax‭  ·  edited 1y ago by trichoplax‭

66%
+2 −0
71%
+3 −0
Challenges Make a frequency table (histogram)

Challenge Given an array in any suitable format, create a frequency table for it. i.e: Pair each unique element with the number of times it appears in the array. You can return the frequency tabl...

10 answers  ·  posted 1y ago by Razetime‭  ·  last activity 1y ago by Moshi‭

Question code-golf math
77%
+5 −0
Challenges Create a range grid

This challenge is based on the i. verb from J. A range grid is basically a range of m × n numbers fit into a rectangular grid with m rows and n columns. A 2×3 range grid would be: 0 1 2 3 4 5 ...

8 answers  ·  posted 2y ago by Razetime‭  ·  last activity 1y ago by Shaggy‭

Question code-golf matrix
81%
+7 −0
Challenges Find n Niven Numbers

Challenge A Niven number is a positive integer which is divisible by the sum of its digits. For example, 81 -> 8+1=9 -> 81%9=0. Your task is to find the first n Niven numbers, given n. Te...

7 answers  ·  posted 1y ago by Razetime‭  ·  last activity 1y ago by Shaggy‭

50%
+0 −0
Sandbox Mark my beacons

posted 1y ago by Razetime‭

Article code-golf matrix
66%
+6 −2
Challenges Multiply complex numbers.

Multiply complex numbers. 2 space-seperated ones will be input, as follows: (update: you can replace i with j or some other symbol if needed) a+bi -a+bi a-bi -a-bi where a and b are integers ...

7 answers  ·  posted 2y ago by heav‭  ·  last activity 1y ago by __blackjack__‭

Question code-golf math
87%
+12 −0
Challenges Partial Sums of Harmonic Series

Given an positive integer $n$, return the least positive integer $k$ such that the $k$th partial sum of the harmonic series is greater than or equal to $n$. For example, if $n = 2$, then $k = 4$, b...

11 answers  ·  posted 3y ago by Quintec‭  ·  last activity 1y ago by south‭

Question code-golf
81%
+7 −0
Challenges Reduce over the range [1..n]

Task I often need to find the factorial of a number or the sum of all numbers up to a number when cheating on math tests. To help me with this, your task is to write $F$, a generalized version of ...

14 answers  ·  posted 2y ago by user‭  ·  last activity 1y ago by gifti‭

81%
+7 −0
Challenges Evens or Odds - you know this one

Get ready for a comparatively dry question - this is intended to be one of the "the"s of the code-golfing dictionary. Create a program which inputs a base 10 non-negative whole number (without lea...

16 answers  ·  posted 2y ago by AndrewTheCodegolfer‭  ·  last activity 1y ago by Olin Lathrop‭

50%
+0 −0
75%
+4 −0
Challenges Find the IP address class

Task Given an IP address as a string, find its IP address class. For reference, here is a table: Class Leadingbits Numberof networks Addressesper network Total addressesin class Start...

6 answers  ·  posted 2y ago by Razetime‭  ·  last activity 1y ago by torres‭

Question code-golf
83%
+8 −0
Challenges Golf a FRACTRAN interpreter

Description From the Esolangs wiki, In Fractran, a program consists of a finite list of positive, rational numbers. The input to a program is a positive integer n. The list is then searched ...

8 answers  ·  posted 3y ago by Razetime‭  ·  last activity 1y ago by torres‭

77%
+5 −0
Challenges A number adder, not a death adder

Create a program P1 which takes as input a base 10 number N1 (the numbers for the variables are important). Given N1, P1 will print a program P2. P2 will take as input a base 10 number N2 and outpu...

14 answers  ·  posted 2y ago by AndrewTheCodegolfer‭  ·  last activity 1y ago by torres‭

85%
+10 −0
Challenges Are All Elements Equal?

Challenge Given a list of integers >= 0 , check if all of them are equal. Tests [1,1,1,1,1] -> true [0,1,1,6,7] -> false [1] -> true [] -> undefined(you do n...

16 answers  ·  posted 2y ago by Razetime‭  ·  last activity 1y ago by torres‭

83%
+8 −0
Challenges Solve Goldbach's Conjecture

Goldbach's Conjecture states that every even whole number greater than 2 is the sum of 2 prime numbers. Your task is to return those 2 prime numbers, given an even whole number as input. There are ...

10 answers  ·  posted 3y ago by Quintec‭  ·  last activity 1y ago by torres‭

Question code-golf math
75%
+4 −0
Challenges The Pell Numbers

Introduction The Pell(no, not Bell) Numbers are a simple, Fibonacci-like sequence, defined by the following relation: $P_n=\begin{cases}0&\mbox{if }n=0;\\1&\mbox{if }n=1;\\2P_{n-1}+P_{n-2...

9 answers  ·  posted 3y ago by Razetime‭  ·  last activity 1y ago by torres‭

71%
+3 −0
Challenges From the smallest seed

Challenge It's a bootstrapping challenge this time! Write a full program that, once run, writes the source code of another program that in turn, once run, writes the source code for another progra...

2 answers  ·  posted 1y ago by Moshi‭  ·  last activity 1y ago by orthoplex‭

81%
+7 −0
Challenges Word Count Tool

In Google Docs, the word count tool looks like this: Pages would not make sense, but your goal is to implement every other count. Definitions Words are strings of text separated by any amount ...

9 answers  ·  posted 2y ago by Quintec‭  ·  last activity 1y ago by torres‭

Question code-golf string
81%
+7 −0
Challenges Collatz conjecture; Count the tries to reach $1$

Background Check out this video on the Collatz conjecture, also known as A006577. If you don't know what this is, we're given an equation of $3x + 1$, and it is applied this way: If $x$ is odd...

15 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 1y ago by torres‭

Question code-golf math number
75%
+4 −0
Sandbox From the smallest seed

posted 2y ago by Moshi‭  ·  edited 1y ago by Moshi‭

60%
+1 −0
Sandbox Double the Size of an Image

posted 2y ago by romanp‭

Article code-golf image
80%
+6 −0
Challenges Write a Deadfish Interpreter

A rewrite of this SE question with a simpler input format and guidelines. Challenge Deadfish uses a single accumulator, on which all commands are to be performed. It has the following commands: ...

8 answers  ·  posted 3y ago by Razetime‭  ·  last activity 2y ago by Zakk‭

85%
+10 −0
Challenges It's Hip to be Square

Challenge A catalogue type challenge that simply asks: Given an integer n (where n>=0) as input return a truthy value if n is a perfect square or a falsey value if not. Rules You may take...

20 answers  ·  posted 2y ago by Shaggy‭  ·  last activity 2y ago by Zakk‭

71%
+3 −0
Sandbox Create a range grid

posted 2y ago by Razetime‭

Article code-golf matrix
33%
+1 −4
Challenges Small integer swapping

In this simple challenge, create a short program that takes 2 ints as input, output them, swap their places, then output them again. Those 2 integers can't be the same number. The program with the ...

7 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by south‭

Question code-golf number
66%
+2 −0
Challenges Make my value binary

Challenge What do computers understand? That's right, binary. All files are turned into binary digits when you run them, but what if I suggest giving you an int then turn it into it's binary value...

14 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by Olin Lathrop‭

Question code-golf number
80%
+6 −0
Challenges Shape of an array

Given a non-ragged array (an array where all sub-arrays at a particular level have the same length) of non-negative integers, answer its shape, that is, the length along every dimension. You may as...

6 answers  ·  posted 3y ago by Adám‭  ·  last activity 2y ago by south‭

Question code-golf
60%
+1 −0
Sandbox Word wrap a string

posted 2y ago by celtschk‭

Article code-golf string
66%
+2 −0
Sandbox Create a finite projective plane of order $n$

posted 2y ago by user‭  ·  edited 2y ago by user‭

Article code-golf math
60%
+1 −0
Challenges Stairs? Stairs! Stairs.

Challenge Make a program that takes input of an integer that's $n > 1$ and print out a staircase using a specific character for stair basing (hashes (#) for demonstration; you can use spaces,...

7 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by radarek‭

81%
+7 −0
Challenges Operation "Find The Operator"

Challenge Make a program that takes input of 3 non-negative integers: a result and 2 other values that once calculated results to the 3rd value. The program must figure out how to get the 2 fir...

5 answers  ·  posted 2y ago by General Sebast1an‭  ·  last activity 2y ago by radarek‭

Question code-golf math number