Linked Questions

32 votes
29 answers
2k 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, ...
107 votes
97 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 ...
108 votes
39 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 ...
235 votes
368 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 ...
28 votes
23 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......
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 ...
90 votes
108 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\...
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. ...
67 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. ...
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 ...
23 votes
15 answers
4k views

Keep the unique characters down

It's very simple: Your program or function should generate the following text: ...
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 ...
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 ...
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 ...
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 ...

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