Efficient Tab Completion code-golf string Many tools that programmers use on a daily basis, like bash and Emacs, have tab completion. Pressing the Tab key in certain situations will attempt to complete the text at the cursor, from a set of possibilities. The term is "completed" by filling in ...

code-golf math Bringing a pair of integers to equality This was inspired by a math problem I saw somewhere on the internet but do not remember where, asking for a proof if the following process is possible for any arbitrary pair of integers (from what I remember, it was possible for any given p...

Relational Division Given a database of colored marbles in bins, find which bin has the most marbles of a certain color. In database administration, this task is known as relational division. Example Input marbles (flexible format, this is just one possibility): red,A blue,B green,C red,B red...

Create a type-safe formatf function code-golf You should create a function in any static typed language (Although I doubt if a nondependently typed language can solve this challenge) so that: The function will receive a string that denotes format. The format string will have %s %i or %f, %s ...

Assign Airliner Seats Inspired by last week's APL lesson. Given an uppercase 2D seat map and a 1D list of customers, return the seat map and the customer list but modified as follows (to indicate occupied seats and seated customers): For each unique letter in the input passenger list, lowercas...

It's Time! code-golftime Originally posted (and deleted) by @Tlink, which was most likely inspired from this StackoverFlow question. Since it was a shame it got deleted, because it seemed like a good challenge in general, I figured I'd repost it with proper formatting and rules. Input: Six dig...

Write a function or program that encodes a string into a Code 39 format barcode, where each character is encoded as five bars separated by four gaps. Either two of the bars and one of the gaps are wide and others are narrow (10*4 codes), or three of the gaps are wide and none of the bars are (4 c...

Shorter coding in non-golfing language Copper write a requirement, a sample program in a golfing language, and a required non-golfing language. Rob hack it with the required language, with fewer bytes of code. I guess it'd be popularity-contest cuz it's sometimes hard to define which is "golfin...

Given a string of printable ASCII text (including newlines and spaces), output a truthy value if the string is rectangular, and a falsey value otherwise. Additionally, the source code for your solution must be rectangular. A string is rectangular if it meets all of the following conditions: Th...

Background In France, and probably in the rest of the European Union, any food available for sale must list the ingredients that compose it on its packaging, in weight percentage descending order. However, the exact percentage doesn't have to be indicated, unless the ingredient is highlighted by...

Find the Fibonacci Patterns code-golf fibonacci You are probably familiar with the Fibonacci sequence where the first two terms are 0, 1 (or sometimes 1, 1) and every term after that is the sum of the previous two. It starts like this: 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, ... Sometimes, ...

Let's say that this array is how many press-ups I've achieved each day in the last 28 days: [ 20,20,20,30,30,30,30, 35,35,40,40,40,45,45, 50,50,50,50,50,50,50, 60,70,80,90,100,110,120 ] As you can see, it's taken a steep upward trend in the last week, and that's the part of this data I...

Nice Tile Connector Your task is to connect the tiles given to you in the input by removing the lines on sides they connect Input A set of tiles that are not yet connected Output The tiles with the walls removed in the right places to connect them Method Each tile in the input looks like t...

The Add-Multiply-Add Sequence Given an integer n > 1, 1) Construct the range of numbers n, n-1, n-2, ... 3, 2, 1 and add them together 2) Take the individual digits of that number and multiply them together 3) Take the individual digits of that number and add them together 4) Repeat steps 2 and ...