# Linked Questions

21 questions linked to/from PPCG Jeopardy: Cops
20 votes
1 answer
542 views

### Diff compression [closed]

For this challenge, you need to compress a diff. A diff is some data that represents the difference between two strings. For this challenge, you need to provide one or more programs that can: Input ...
41 votes
9 answers
6k views

### "Convenient palindrome" checker

If you've ever tried to write palindromic code before, you'd know how much brackets tend to get in your way. ()() is not a palindrome, even though it kinda looks ...
18 votes
17 answers
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 ...
42 votes
16 answers
7k views

### Use xkcd's formula to approximate the world population

In xkcd 1047, Randall Munroe lists "slightly wrong" approximations of assorted quantities and numbers with varying precision and complexity, such as that the number of liters in a gallon is very close ...
6 votes
28 answers
2k views

### String Shenanigans

Challenge In this challenge, you are to code in any language a program or function that will take a string and replace certain characters within it with different characters. Input The input is the ...
19 votes
21 answers
2k views

### Length of String Using Set Theory

From Wikipedia Set-theoretic definition of natural numbers The set N of natural numbers is defined as the smallest set containing 0 and closed under the successor function S defined by S(n) = n ∪ ...

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