Linked Questions
21 questions linked to/from PPCG Jeopardy: Cops
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
29
votes
26
answers
1k
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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, ...
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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.
...
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27
votes
21
answers
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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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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 ∪ ...
- 365
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 ...
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18
votes
17
answers
1k
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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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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 ...
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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 ...
- 1,042
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
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 ...
- 3,112
22
votes
10
answers
3k
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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 ...
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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 ...
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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 ...
- 28.9k
20
votes
1
answer
532
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 ...
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