Related Your goal, is to write a set of programs, that progresses from one to the other, one character at a time. For example. Given the starting program abcd and the ending program wxyz, you should have 5 valid programs, with the respective outputs. abcd -> wbcd wbcd -> wxcd wxcd -> wxyd wxyd ->...

Context I'm building an enciphering application (for fun) which is based on Enigma. Central to the design are virtual rotors (digital equivalents of the physical ones used in Enigma), where (in simple terms) a visible letter is mapped to a secret one. For example, if the visible letters on a...

Help! My Completely Automated Lights From Darks Separator V3001.01 broke! :( Guidelines Task Write a program that will take an input of an array (or a list in some languages) of any amount of strings that are either the letter L or the letter D (representing lights or darks) and output an a...

This challenge is based off of Helka Homba's question Programming a Pristine World. From that question, the definition of a pristine program is: Let's define a pristine program as a program that does not have any errors itself but will error if you modify it by removing any contiguous substri...

You have to write program in the above specified language(s) that exactly replicates this pattern: Quite self-explanatory. Notes: No code containing just print lines, you need to use logic. Only one code per person. Smartness of course is more appreciated

Thanks to FryAmTheEggman for the idea for this second version. Version 1 here. Not-so-simple challenge: given a number of cards, build the tallest house of cards you can with that number of cards. Examples: Input: 1 Output: <empty|whitespace|newline> Input: 2 Output: /\ Input: 3 Output...

Guidelines Scenario John has an important number, and he doesn't want others to see it. He decided to encrypt the number, using the following steps: His number is always a non strict increasing sequence (ie. "123") He converted each digit into English words. (ie. "123" -> "ONETWOTHREE") And...

Write a program or function that given two integers a, b outputs a string containing a decimal number representing the fraction a/b exactly. If a/b is integer, simply output the value, without a decimal dot or leading zeroes: 123562375921304812375087183597 / 2777 -> 44494913907563850333124661 8...

Let's simplify polynomials In many situations we have to expand mathematical expressions containing variables, for example, calculating characteristic polynomials, expanding products of polynomials, etc. It is trivial if the variables are known (in this case, we just substitute the variables wit...

Your task is simple: write a program that receives an integer as input and outputs it if it was odd, and does nothing otherwise. The challenge is, that you can only use odd printable ascii characters !#')+/13579;=?ACEGIKMOQSUWY[]_acegikmoqsuwy{}, as well as the whitespace characters <TAB> and <CR>...

The Builtin Test, Part 1: One Million popularity-contest kolmogorov-complexity A lot of people are always fascinated to find some of the strange and obscure builtins many of the popular golfing languages have, so I've decided to do a series of challenges entirely based around builtins. For this...

We seem to quite like digit runs lately, so here's a fairly simple challenge. Given a positive integer, split it into it's digit runs, and return the product. For example: 11122333 would become 111, 22, 333, the product of which is 813186 Input may be taken as an integer, string, or list/arra...

Given a list (array) of names, your challenge is to join the items using some glue and abbreviate the longest items first until the joined string fits a maximum length. And output that string. Since the glue is part of the final string, the length of the glue is included too Abbreviation is don...