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A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

Lean is a proof assistant from Microsoft Research, and its associated language. Note that challenges that require the answers to be in a specific language are generally discouraged.
7 questions
For challenges involving equations, in one or more variables.
7 questions
For challenges related to structured query language (SQL), including but not limited to short sql code, query result challenges or fixing invalid queries. Note that challenges that require the answers…
7 questions
Hiding data inside another file - often an image.
7 questions
Challenges for which the input, output, and/or source contains an ascii connected map or graph.
7 questions
A Markov chain is a mathematical system that undergoes transitions from one state to another on a state space.
7 questions
This challenge is related to the R language. Note that challenges that require the answers to be in a specific language are generally discouraged.
7 questions
Duct tape coding involves creating a program to accomplish a certain task, simply by copying and pasting source code from a StackExchange site.
6 questions
This challenge is related to the Ruby language. Note that challenges that require the answers to be in a specific language are generally discouraged.
6 questions
This challenge is related to the Perl language. Note that challenges that require the answers to be in a specific language are generally discouraged.
6 questions
For questions regarding languages for golfing.
6 questions
This challenge is related to the Manufactoria language/game. Note that challenges that require the answers to be in a specific language are generally discouraged.
6 questions
For challenges in which answers should aim to use every code-point in a specific code page at least once.
6 questions
For challenges involving neural networks or related systems
6 questions
For challenges in which there are multiple separate parts of the challenge that interact with each other, and where each part has interaction among itself
6 questions
A no-input esoteric programming language with only 4 commands i,d,s,o. Note that challenges that require the answers to be in a specific language are generally discouraged.
6 questions
For questions involving computational methods to parse or edit biological data, such as DNA sequences.
5 questions
related to the CJam language. Note that challenges that require the answers to be in a specific language are generally discouraged.
5 questions
The _GOLF_ CPU is a toy CPU with a simple instruction set that allows precise measurement of performance for challenges.
5 questions
Proof-golf is a competition to prove a particular theorem/statement using the fewest number of substitutions/steps given a set of axioms.
5 questions
This challenge is related to the PowerShell language. Note that challenges that require the answers to be in a specific language are generally discouraged.
5 questions
This challenge is related to the Lua language. Note that challenges that require the answers to be in a specific language are generally discouraged.
5 questions
indicates that the challenge will require the recognition of characters from image data.
4 questions
Code shuffleboard involves aiming to optimise a score towards a target, not necessarily the highest or lowest scores.
4 questions
Challenges released as part of the First Periodic Premier Programming Puzzle Push, an event encouraging high-quality puzzles and tasks. Do not use this tag for new questions.
4 questions
For challenges about Cubically, the esoteric programming language based on Rubik's Cube. Note that challenges that require the answers to be in a specific language are generally discouraged.
4 questions
This challenge is related to the Octave language. Note that challenges that require the answers to be in a specific language are generally discouraged.
4 questions
This challenge is related to the Scala language. Note that challenges that require the answers to be in a specific language are generally discouraged.
4 questions
For questions involving writing, golfing, or otherwise pertaining to genetic algorithms (meta-programs that mimic natural selection).
4 questions
For challenges about objects and processes or physics and chemistry of such kind that originate outside the atmosphere of Earth.
4 questions
for tips about Vyxal or challenges involving Vyxal. Note that challenges that require the answers to be in a specific language are generally discouraged.
3 questions
used for challenges related to rotating or shifting elements in an array, matrix, or string in Code Golf Stack Exchange.
3 questions
For challenges in which a program does task A, but when a transform B is applied to the program the modified program does B applied to A.
3 questions
For challenges related to the Lost language. Note that challenges that require the answers to be in a specific language are generally discouraged.
3 questions
For challenges related to the Swift language. Note that language specific challenges are generally discouraged.
3 questions
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