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.

Type to find tags:
× 1695
a competition to solve a particular problem in the fewest characters or bytes of source code. If source code length is not the primary scoring criterion, consider using another tag instea…
× 360
a competition for creative ways to solve a programming puzzle with an objective winning criterion not covered by other scoring tags (e.g. code-golf).
× 275
a competition where the correct answer with the highest vote tally (upvotes minus downvotes) wins, usually the most creative answer. Please only use this tag if your question i…
× 249
The challenge involves mathematics. Also consider using more specific tags: [number] [number-theory] [arithmetic] [combinatorics] [graphs] [geometry].
× 142
intended to be solved by using, creating, or resolving some processing algorithm.
× 127
This challenge involves creating pictures using text characters as the paint. Typically this uses only 95 printable (from a total of 128) characters defined by the ASCII Standard from 1963.
× 112
A competition to solve a particular problem through the usage and manipulation of strings.
× 95
intended to be solved by using, manipulating, accepting as input, or outputting numeric values.
× 76
This challenge involves drawing pictures on a screen or generating image files. For pure ASCII art contests, use [tag:ascii-art] instead. If participants can choose between graphics and ASCII art, use…
× 65
the amount of code it takes to produce a given string of text. When posting a challenge in this category, please make sure it adds something new to the challenges…
× 60
Imposes a restriction on the source code used to solve the challenge, for example, having no numbers in the source code.
× 59
determined by the runtime performance of the submissions. For scoring by asymptotic time complexity, use [tag:fastest-algorithm] instead. "Faster, faster would …
× 56
Tips for either golfing or programming challenges. In most current cases it is for helpful tips and tricks how one could golf more effectively with a particular language.
× 53
generally based upon, related to, or simulates game or some portion of one.
× 48
a program which produces its source as output. This tag indicates that the challenge is related to quines.
× 41
a number that is only divisible by 1 and itself.
× 38
Questions related to elementary arithmetic.
× 38
A challenge to write a program that looks like it does one thing, but, in reality, does something else. Votes reflect how non-obvious the bug is.
× 35
Number theory involves properties and relationships of numbers, primarily positive integers.
× 35
King-of-the-hill indicates a game where the submissions interact with and compete against each other in some form of game. Competitions which pit programs against each other without interaction should…
× 34
related to the C language. Note that challenges that require the answers to be in a specific language are generally discouraged.
× 34
for challenges involving some sort of sequence.
× 32
Tasks involving writing interpreters for various languages or formalisms.
× 31
intended to be solved by sorting, ordering, or otherwise organizing some set of data.
× 31
Tasks involving random numbers and/or output.
× 29
for challenges involving combinatorics.
× 28
intended to be solved by using, manipulating, accepting as input, outputting, or calculating calendar dates.
× 27
related to the C++ language. Note that challenges that require the answers to be in a specific language are generally discouraged.
× 27
A challenge that involves making a Hello world program.
× 27
for challenges involving optimizing a certain thing.
× 26
related to the JavaScript language. Note that challenges that require the answers to be in a specific language are generally discouraged.
× 26
Problems relating to graph theory
× 26
related to the Python language. Note that challenges that require the answers to be in a specific language are generally discouraged.
× 24
Code Golf scored by the number of tokens of your program, excluding any syntactical separators (`()[]{}. ;` is a general rule.)
× 23
related to the BF language. Note that challenges that require the answers to be in a specific language are generally discouraged.
× 23
a strategic game played with two players on a checkered grid. This tag is for challenges related to chess or any derivative of it.