20 questions linked to/from Tips for golfing in APL
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### 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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### 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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### 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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### 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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### 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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### 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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### 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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### Tips for golfing in J

GolfScript gets its own way far too often and I feel that a repository of handy hints for golfing in J might help in the fight against the evil empire. What tips do you have for making this already ...
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### 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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### pleTriwapt Sgpin (Triplet Swapping)

Intro/Background I was looking at a Flybuys card at Coles recently and noticed that if I took something like this: Source, randomly found on the Internet And swapped some words around, I'd get ...
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### Alternating Pattern

In a now deleted stackoverflow question, someone posted the following: Write a program or function to print alternating patterns in * and ...
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### Add N numbers without using + or -

Given N integers, output the sum of those integers. Input You may take the integers in any reasonable format, including: stdin arguments an array or list Rules ...
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### The SBEVE Challenge

She said s(he) be(lie)ve(d), he said sbeve. Input A non-empty string, s. It's guaranteed that s will have only printable ASCII ...