Linked Questions

45
votes
35answers
2k views

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 ...
22
votes
27answers
2k views

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, ...
37
votes
13answers
5k views

Palindromic palindrome checker [closed]

Write a program to test if a string is palindromic, with the added condition that the program be palindromic itself.
19
votes
29answers
5k views

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 ...
28
votes
10answers
2k views

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 ...
18
votes
17answers
1k views

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 ...
17
votes
7answers
918 views

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 ...
22
votes
8answers
877 views

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 ...
16
votes
2answers
806 views

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 ...
5
votes
4answers
611 views

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 (...