Linked Questions

44 votes
64 answers
6k views

An abundance of integers!

An Abundant number is any number where the sum of its proper divisors is greater than the original number. For example, the proper divisors of 12 are: ...
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40 votes
68 answers
6k views

Random Capitalization

The Task Your task is to create a program or a function that, given an input, outputs the input text with random letters capitalized, while keeping already capitalized letters capitalized. Every ...
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  • 427
80 votes
30 answers
12k views

Create an "H" from smaller "H"s

Challenge Create a function or program that, when given an integer size, does the following: If size is equal to 1, output ...
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32 votes
43 answers
3k views

Is this a Permutation of 1..n

Input a non-empty array with \$n\$ positive integers. Test if the input array contains every integer in \$1\cdots n\$. In case you prefer 0-indexed numbers, you may choose to input an array of non-...
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  • 28.6k
52 votes
30 answers
6k views

Let's golf a BIBABOBU decoder

While I was traveling in the future, I noticed a funny game among kids circa 2275. When they don't want their great-great-great-great-grand parents to understand what they're saying, they use the ...
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  • 166k
20 votes
51 answers
2k views

Are All the Items the Same?

Given a list of non-negative integers, return whether or not that list is all the same number. Rules Input and output can be taken/given in any reasonable and convenient format Truthy/Falsey values ...
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  • 21k
22 votes
53 answers
3k views

Sum square difference

The sum of the squares of the first ten natural numbers is, \$1^2 + 2^2 + \dots + 10^2 = 385\$ The square of the sum of the first ten natural numbers is, \$(1 + 2 + ... + 10)^2 = 55^2 = 3025\$ ...
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27 votes
33 answers
2k views

Rotation summation

Take a square matrix containing positive integers as input, and calculate the "rotated sum" of the matrix. Rotated sum: Take the sum of the original matrix and the same matrix rotated 90, 180 and ...
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18 votes
51 answers
3k views

The max() is not enough

Intro A friend posed this question today in a slightly different way - "Can a single [Python] command determine the largest of some integers AND that they aren't equal?". While we didn't find a way ...
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25 votes
31 answers
3k views

"-rot" transform

Background -rot transform (read as "minus-rot transform") is a sequence transformation I just invented. This transform is done by viewing the sequence as a stack in Forth or Factor (first ...
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  • 62.1k
28 votes
26 answers
3k views

Print the sequence

21, 21, 23, 20, 5, 25, 31, 24, ? Inspired by this Puzzle, given an integer \$n>0\$ , print out the following sequence until you reach a non-Integer (spoilered, in case you want to solve the puzzle ...
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  • 1,365
33 votes
27 answers
3k views

Find the nearest greater number

The task Given any array of integers, e.g.: [-1,476,578,27,0,1,-1,1,2] and an index of that array (this example uses 0 based indexing, though you can use 1 based ...
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  • 2,721
19 votes
28 answers
2k views

Pendulum Encoding

Given a string as an input (which can be any acceptable/convenient format in your language), implement pendulum encoding. The test cases are split into individual items (which aren't quoted) for a ...
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18 votes
34 answers
3k views

Pythagorean triples given the hypotenuse

Definition (from Wikipedia) A Pythagorean triple consists of three positive integers a, b, and c, such that a² + b² = c². The typical example of a Pythagorean triple is (3,4,5): 3² + 4² = 9 + 16 = 25 ...
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  • 17.8k
27 votes
25 answers
4k views

ASCII art reflection

In this challenge, you will be given a text block, and you need to perform reflection on the text. Input: A string to be reflected. The text may not be supplied as an array whose elements are the ...
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