Related: Clearly parenthesize APL trains Background In the most basic form, APL has two kinds of tokens: arrays and functions. For this challenge, we will use a lowercase letter a-z for an array, and an uppercase letter A-Z for a function. Furthermore, we will assume each character is a token o...

Objective Given a string with single Unicode vulgar fraction, parse it to a rational number. Valid inputs A valid input is one of: ¼ U+00BC; one quarter ½ U+00BD; one half ¾ U+00BE; three quarters ⅐ U+2150; one seventh ⅑ U+2151; one ninth ⅒ U+2152; one tenth ⅓ U+2153; one third ⅔ U+2154; two...

The problem over here introduces an new type of strings: if you split the string into equal halfs and swap the pairs, it produces the same output as sorting the string. We call that a half-sort. Given a purely ASCII string, check if the string is in a half-sort. An example of a half-sort string...

Given \$A = (a_1,\dots,a_k)\ k\ge2 \$ a nonrepetitive sequence of positive integers. Starting from \$i=2\$, while \$a_i\in A:\$ If \$d=|a_i-a_{i-1}|\$ is not already in \$A\$, append \$d\$ to \$A\$ Increase \$i\$ Output the completed sequence. This is code-golf Example In: 16 21 11 2 ...

It seems now few questions show enough serious sense, and lots are just random requirements. Where do good ones go, are they dilutioned, deleted or just posted less? [This post will be deleted when vote reach +5, yea also for random reason]

A magic square is an \$ n \times n \$ square grid, such that the sum of the integers on each row and column are equal. Note that the definition which will be used in this challenge is different than the one used by Wikipedia, since diagonal sums are not accounted for the numbers are not require...