Linked Questions
21 questions linked to/from PPCG Jeopardy: Cops
18
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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 ...
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27
votes
21
answers
1k
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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......
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29
votes
26
answers
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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, ...
- 104k
20
votes
1
answer
534
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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 ...
- 14.4k
90
votes
107
answers
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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\...
user55673
66
votes
65
answers
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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.
...
- 15.1k
17
votes
4
answers
3k
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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 ...
- 28.9k
66
votes
29
answers
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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 ...
- 6,656
46
votes
19
answers
5k
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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 ...
- 1,861
106
votes
96
answers
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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 ...
- 2,394
108
votes
38
answers
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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 ...
- 8,503
42
votes
16
answers
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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 ...
- 10.3k
234
votes
366
answers
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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 ...
- 210k
6
votes
28
answers
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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 ...
- 1,586
23
votes
15
answers
4k
views
Keep the unique characters down
It's very simple: Your program or function should generate the following text:
...
- 4,800