Linked Questions
21 questions linked to/from PPCG Jeopardy: Cops
234
votes
366
answers
65k
views
Is this number a prime?
Believe it or not, we do not yet have a code golf challenge for a simple primality test. While it may not be the most interesting challenge, particularly for "usual" languages, it can be nontrivial in ...
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18
votes
22
answers
2k
views
Find the substring with the most 1's in a sequence
Introduction
I want to find the substring with the most 1's in a sequence of 0's and 1's.
...
- 5,773
90
votes
107
answers
13k
views
Count of "a"s and "b"s must be equal. Did you get it computer?
In the popular (and essential) computer science book, An Introduction to Formal Languages and Automata by Peter Linz, the following formal language is frequently stated:
$$\large{L=\{a^n b^n:n\in\...
- 46.5k
66
votes
65
answers
9k
views
Convert YYYYMM to MMMYY
Basing on this SO question.
Challenge is rather simple: given a date period in the format YYYYMM output it in the format MMMYY.
...
- 13.4k
106
votes
96
answers
23k
views
Draw the national flag of France
There have been many other flag challenges posted but not one for the national flag of France. This week seems like an appropriate time.
Produce this flag in the fewest bytes possible:
The image must ...
- 536
94
votes
15
answers
19k
views
I am passive aggressive and want to insult my boss without him finding out
It's been a rough few months at work and I feel like I just want to scream right to my boss' face. I am, however, not one to directly confront people I have a problem with. I also don't want to lose ...
- 2,734
29
votes
13
answers
5k
views
Lifetime of a Worm
Terms
A worm is any list of nonnegative integers, and its rightmost (i.e., last) element is called the head. If the head is not 0, the worm has an active segment consisting of the longest contiguous ...
- 1,667
23
votes
15
answers
4k
views
Keep the unique characters down
It's very simple: Your program or function should generate the following text:
...
- 35.6k
66
votes
29
answers
18k
views
Why was 6 afraid of 7?
Why was 6 afraid of 7? Because 7 8 9!
Given a string apply the following transformations:
If there is a 6 next to a 7 remove the 6 (6 is afraid of 7)
If the sequence "789" appears remove the 8 and ...
- 5,773
108
votes
38
answers
7k
views
Source code ecological footprint
You've just been hired by a German car manufacturing company. Your first task, as an engineer, is to write a program that computes the ecological footprint of ASCII strings.
The ecological footprint ...
- 3,406
29
votes
26
answers
1k
views
Natural construction
The natural numbers including 0 are formally defined as sets, in the following way:
Number 0 is defined as the empty set, {}
For n ≥ 0, number n+1 is defined as n ∪ {n}.
As a consequence, n = {0, 1, ...
- 9,821
22
votes
10
answers
3k
views
Can the maze be solved?
Task
Print 0 if an n*m maze cannot be solved
Print 1 if an n*m maze can be solved (in 1 or more ways)
(so I'm not asking for ...
- 6,876
27
votes
21
answers
1k
views
Primenary Strings
A Primenary (binary-prime) string is one which, when written as a binary grid, every row and column has a prime total.
That's quite a vague explanation, so let's break it down with a worked example......
CommunityBot
- 1
46
votes
19
answers
5k
views
Lever Simulator 2015
Why a Simulator?
Kids these days don't have the time nor the ambition to actually go and stack boxes on the see-saw or play around with balancing physical objects. This leaves lots of room in the ...
CommunityBot
- 1
17
votes
4
answers
3k
views
What's the Language?
Recently, the PPCG design leaderboard has been having some trouble parsing answer html headers.
In this challenge you'll be taking your own shot at parsing answer headers.
Example Test Cases
These ...
- 210k
20
votes
1
answer
531
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 ...
- 210k
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 ...
CommunityBot
- 1
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 ...
CommunityBot
- 1
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 ...
CommunityBot
- 1
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 ...
CommunityBot
- 1
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 ∪ ...
CommunityBot
- 1