Linked Questions

Your task is to create the shortest infinite loop! The point of this challenge is to create an infinite loop producing no output, unlike its possible duplicate. The reason to this is because the code ...

Write a program that outputs the lyrics to 99 Bottles of Beer, in as few bytes as possible. Lyrics: ...

This year's UEFA Euro 2016 is over and besides a couple of negative headlines there has been a very positive surprise as well – the Iceland national football team. Let's draw their national flag. ...

Challenge: In the programming language of your choice, take no input and output your programming language's name. Fair enough, right? Restrictions: You can't use any character that is included in ...

Introduction In number theory, a number is considered evil if there are an even number of 1's in its binary representation. In today's challenge, you will be identifying whether or not a given number ...

Most computer keyboards feature a small integrated LED light, indicating the current input mode, as controlled with the CAPS LOCK button. Your task is to blink it: Turn it on; Wait for 0.5 (+/-0.1) ...

You've just been hired by a German car manufacturing company. Your first task, as an engineer, is to write a program that computes the ecological footprint of ASCII strings. The ecological footprint ...

You are to print this exact text: ...

The Challenge Your task is to create a program or function that outputs the following with no input: ...

Print 0 to 100 without using characters 1,2,3,4,5,6,7,8,9 in your code. Seperator of numbers can be comma, whitespace or newline. Shortest code wins.

So, last week I posted a challenge to play Duck, Duck, Goose. This lead to a number of Minnesotans commenting about their regional 'Gray duck' variation. So here's the rules: Using this list of ...

Task Using any type of parallelisation, wait multiple periods, for a total sleep time of at least a minute (but less than a minute and a half). The program/function must terminate within 10 seconds ...

We live in a wonderful age of technology where we can have beautifully detailed 8K screens on our TVs, and even 2K displays on our phones for our mobile browsing pleasure. We've come a long way in ...

Challenge Sandbox post Given a positive integer (K) Output a uniformly-random integer (Y) between ...

At runtime, keep prompting for a line of input until the user inputs something (other than an empty newline), i.e. does not just press Enter or OK. Output or result is neither required nor prohibited. ...

Inspired by We had a unit test once which only failed on Sundays, write a program or function that does nothing but throw an error when it is Sunday, and exit gracefully on any other day. Rules: No ...

Your task is to draw the mandelbrot set in ascii. It should look something like The complex number c lies in the mandelbrot set, when the sequence ...

it's a-me! Today's task is simple: write a program, or a function that displays the idle small Mario sprite, from Super Mario Bros, on NES, over a blue background. Any kind of entry is valid as long ...

Objective Your goal is to make a program that converts an input to its acronym. Your input is guaranteed to have only letters and spaces. The input will have exactly one space between words. You must ...

This is a problem on Luogu OJ. I decided to post it here because on Luogu OJ, many people, including me and my friend, are interested about how to solve this problem within the fewest characters. ...

Pretty simple challenge today: Write a program or function that takes in a positive integer N and prints or returns a sorted list of the unique numbers that appear in the multiplication table whose ...

Make a fake loader just like this : Parameters : Display loading (space) one of these cyclically-\|/ (space) (percentage ...

Write the shortest function to convert an IP address into it's integer representation and output it as an integer. To change an IPv4 address to it's integer representation, the following calculation ...

Introduction Imagine that line of chars is in fact two rows. Upper row - dots - represents hours (24 hour system), while lower - commas - represents minutes. One character can represent hour, minute ...

Your challenge is to write a code-golf HTTP server that accepts GET requests. It obviously doesn't have to be fully featured, but it must serve files from a directory. Rules: The HTTP server must ...

Definition Define the nth array of the CURR sequence as follows. Begin with the singleton array A = [n]. For each integer k in A, replace the entry k with k natural numbers, counting up from 1 to k. ...

It seems that many people would like to have this, so it's now a sequel to this challenge! Definition: a prime power is a natural number that can be expressed in the form pn where p is a prime and n ...

Given an integer n, print out n * reversed(n) reversed(n) is the number you get when you <...

With the given text below, there are some words in the text that repeats several times in the text. Use any programming language to write a short code that compresses the text to display it. Or in ...

An ant walks along the edges (not faces) of a wireframe cube. Each vertex it encounters presents it with a fork from which two new edges branch off. The ant chooses which way to turn -- ...

Given a 2-dimensional jagged array and a fill value, pad the array in both dimensions with the fill value to ensure that it is square and not jagged (i.e., all rows are the same length, and that ...

At runtime, keep prompting for a line of input until the user input is not the name of an existing file or directory or other file system item, relative to the current working directory. Then return/...

Your job is to take a string input and a number and align the string to the right, making the width of the text the number. When a line is too long, break it and put the rest on the next line, ...

Introduction The Cartesian product of two lists is calculated by iterating over every element in the first and second list and outputting points. This is not a very good definition, so here are some ...

Your task is to take an input string of ascii characters and output the string as a series of vertical words separated by spaces. An example is shown below: Given the string: ...

Objective You are to write a program that receives an integer n as input (from the command line), and embeds itself (the program) ...

yOu wiLl bE giVen A sTriNg wHich cOnsiSts oF pRintAble asCii cHarActErs. yOu iTeraTe tHrougH thE sTrIng tHen chAnge rAndOM(uNifoRm, 50% cHanCe uPPercAse) lEtteRs to uPPercAse aNd eVerytHing ...

Convert short date format into English long date in as few bytes as possible. Input Input will be in the form of a string with format, yyyy-mm-dd, with zero padding ...

Given a binary sequence of finite length, find the starting position where this sequence first appears in the binary digits of π (after the decimal). You can assume that an answer exists for any input ...

For Gregorian calendars, the date format varies from a country to another. There are three main formats recognized: YY-MM-DD (big-endian) ...

A lazy physicist has the job to perform the double slit experiment. However, they are lazy and can't be bothered to set up all the equipment themselves and so are going to simulate the effects. They ...

Your task is to implement a program similar to the nl command-line tool from the GNU core utilities. Standard loopholes are banned. You may not use any built-in ...

As we all know, modern operating systems have thread schedulers that can pick different orders to schedule your threads based on internal logic which your code is not privy to. Normally you architect ...

Adapted from tips for restricted-source in Python Just like code-golf, restricted-source pushes one to exploit quirks and hidden features of the zsh language. While we already have a place to collect ...