Objective Given a nonempty multiset of Rock, Paper, and Scissors, output the winning figure according to the special rule. Background For a multiplayer RPS, if all three figures come out, usually it's considered a draw. But by that rule, the probability to draw would dramatically increase when...

These are the classical puzzles: You need to boil eggs for exactly 9 minutes, or else the visiting Duchess will complain, and you will lose your job as head chef. But you have only 2 Hourglasses, one measures 7 minutes, and the other measures 4 minutes. How can you correctly measure 9 mi...

Task A Rotate-Left-Double number in base \$n\$ is a number \$m\$, when its base-\$n\$ digits are rotated left once, equals \$2m\$. The base-\$n\$ representation of \$m\$ cannot have leading zeros. One example in base 7 is the number 480, or \$1254_7\$. When rotated left once, the value becomes ...

Note: How should we deal with chameleon questions is about a challenge that has a description significantly changed so that existing answers are invalidated in the way. This question is about a different definition of "chameleon challenge". Definition: Chameleon challenge A chameleon challeng...

Correct the Roman Numerals code-golf string roman-numerals Take a roman numeral as input, and output the correct form. Examples I -> I II -> II IIII -> IV IIIII -> V VIIII -> IX VV -> X IIIIIIIIII -> X

The edit distance between two strings is the minimum number of single character insertions, deletions and substitutions needed to transform one string into the other. This task is simply to write code that determines if two strings have edit distance exactly 2 from each other. The twist is that...

Decode Arabic to Arabic Presentation Form Objective Given an Arabic string consisting of ISO/IEC 8859-6 Arabic letters (U+0621–063A, 0640–064A), decode it to Arabic Presentation Form-B (U+FE70–FEFF). Behavior of Arabic letters ISO/IEC 8859-6 Arabic letters change their displayed form to lette...

Say, I propose a challenge like Scream Very Loudly, but the program must print 'A' once a second and must halt immediately when Enter key is pressed. If I understand parallelism and concurrency correctly, that would require two threads in parallel, one printing 'A' and one waiting for an input. ...

A few months ago I posted a few interesting bits of research on data from SEDE. It was fairly well-received, so I figured I'd do some more analysis. I might make this a weekly thing. I decided to start with tags. This post will show some data relating to the most used tags, the popularity of pos...