Linked Questions

49 votes
35 answers

PPCG Jeopardy: Cops

How well do you know the site? Let's find out. This is a cops-and-robbers challenge. Robber's thread. As a cop, you need to: Find a non-deleted, non-closed challenge on this site to answer. The ...
Nathan Merrill's user avatar
23 votes
40 answers

Palindromic palindrome generator

Create a program, that converts input string to a palindrome starting with the input string. The program itself must be a palindrome. For example input: neverod, ...
tmp's user avatar
  • 481
38 votes
13 answers

Palindromic palindrome checker [closed]

Write a program to test if a string is palindromic, with the added condition that the program be palindromic itself.
moinudin's user avatar
  • 12.7k
20 votes
31 answers

Multiply all numbers in a string

Winner: Chilemagic, a massive 21 bytes! You may continue to submit your answer, however you can no longer win. Original post kept: Your goal is to find all numbers in a string, and multiply each one ...
Jon's user avatar
  • 1,543
27 votes
10 answers

Heterograms, Palindromes, oh my!

(First challenge, please let me know if there are any problems with it.) A heterogram is a word where no letter of the alphabet occurs more than once, and a palindrome is a phrase that is the same ...
a spaghetto's user avatar
  • 11.2k
14 votes
19 answers

Mirror and reverse text

Inspired by I reverse the source code, ... Your task, if you wish to accept it, is to reverse text and mirror select characters. Yes, yes, I know. Very surprising. Input A string, ...
S.S. Anne's user avatar
  • 3,308
18 votes
17 answers

PPCG Jeopardy: Robbers

How well do you know the site? Let's find out. This is a cops-and-robbers challenge. Cop's thread. As a robber, you need to: Find a non-deleted, non-closed challenge that matches a cop's ...
Nathan Merrill's user avatar
23 votes
8 answers

I'm symmetric, not palindromic!

Background Inspired by I'm a palindrome. Are you?, where it is presented the shocking fact that “()() is not a palindrome, but ...
Renzo's user avatar
  • 2,578
17 votes
7 answers

Normal and visual string reversion

Write some code that acts as a cat program. That is, to input a string and output it as is. But the normal reversion of your code must output the normal reversion of the input string. And the visual ...
jimmy23013's user avatar
18 votes
2 answers

Find out if this a valid Stack Cats program, in Stack Cats style!

Background Stack Cats is a reversible esoteric language made by Martin Ender. Each command in Stack Cats is either the inverse of itself (represented as a symmetric character, such as ...
Bubbler's user avatar
  • 77.1k
4 votes
4 answers

The Essential™ (comment-free) Convenient Palindromic Quine Golf

A program is "conveniently palindromic" if it is equal to the string derived when its reverse has all its parentheses (()), brackets (...
noɥʇʎԀʎzɐɹƆ's user avatar