This challenge requires to label input data with a certain class, based on the properties of the data.
10
votes
3answers
368 views
Print a specific value in the Wythoff matrix modulo 2
The Wythoff matrix is an infinite matrix consisting of the Grundy numbers of each square on a chessboard in Wythoff's game.
Each entry in this matrix is equal to the smallest nonnegative number that ...
22
votes
2answers
663 views
Guess the language
Introduction
This site is rapidly building up a huge dataset of code snippets, so let's do something with it!
Here's a data file. It contains 9,066 unique language+snippet pairs for 113 languages, ...
6
votes
5answers
250 views
Golf the K-means algorithm
K-means is a standard unsupervised clustering algorithm, which, given a set of "points" and a number of clusters K, will assign each "point" to one of K clusters.
Pseudo-Code of K-means
Note that ...
20
votes
6answers
2k views
Determine If a Challenge is Worth Answering
I am a very casual code golfer, and don't often see posts until they show up in the "Hot Network Questions" sidebar over on StackOverflow. Usually, I'm late to the game, and since the only language I ...
16
votes
5answers
830 views
Is this number random?
I asked random.org for 128 random integers between 0 and 232 - 1. Since the random number generator was so eager to give the first 64 numbers first, they're obviously more random than the other 64.
...
9
votes
1answer
229 views
Human Friendly Filename Detection
Introduction
File names can be wildly varying things, ranging from a simple blah.txt to 303549020150514101638190-MSP0.txt. The former is usually human generated, while the latter is often machine ...
18
votes
5answers
2k views
How many characters are there on the icon of a Stack Exchange site?
Given the name of a Stack Exchange site which doesn't have their own design yet, decide how many ASCII characters (non-ASCII ones are counted separately) are there on their icons. Your code should ...
14
votes
6answers
759 views
Who said that? 2016 Presidential election
In this challenge, your task is to make write a program with less than 300 characters that takes a short paragraph or a few sentences that a candidate has said and output who said it.
Input: Can be ...
216
votes
5answers
15k views
Upgoat or Downgoat?
Given an image of a goat, your program should best try to identify whether the goat is upside down, or not.
Examples
These are examples of what the input may be. Not actual inputs
Input:
Output:
...
15
votes
3answers
413 views
What language is this word?
Your should write a program or function that determines the language of a given word.
The task is to recognize some of the 5000 most common words in 4 languages:
English
German
Italian
Hungarian
...
13
votes
2answers
214 views
Is it a valid consonant cluster in Lojban?
.i xu .e'o lo zunsnagri cu drani loka jboge'a
Given an input of a string consisting of two characters, output whether it is a
valid consonant cluster in Lojban.
Here is a quote from CLL 3.6 ...
39
votes
9answers
5k views
Predict whether a message will be starred or not in 50 bytes
Given an input of a string consisting of any message from our site
chatroom taken
from the list described and linked below, output either a truthy or a falsy
value attempting to predict whether that ...
26
votes
17answers
2k views
Which Row is the Key On?
Given any of the following characters (or a newline):
`1234567890-=~!@#$%^&*()_+qwertyuiop[]\QWERTYUIOP{}|asdfghjkl;'ASDFGHJKL:"zxcvbnm,./ZXCVBNM<>?
Your program must output the row that ...
25
votes
3answers
563 views
¿xu ti te gismytermorna? (Is it a valid gismu?)
(Literally: "Does this follow/realize the gismu-form?")
Premise
The language Lojban is a constructed language, meaning in part that all of its words have been created rather than allowed to develop ...
7
votes
3answers
275 views
Guess the hidden communities
Background
This challenge is about the stochastic block model.
Basically, you are given an undirected graph, where the nodes represent people, and the edges represent social connections between them.
...
15
votes
6answers
468 views
Who's that probability distribution?
Introduction
In this challenge, you are given a list of nonnegative floating point numbers drawn independently from some probability distribution.
Your task is to infer that distribution from the ...
23
votes
7answers
3k views
Valid snakes on a plane
Inspired by one of Vi Hart's videos (which are a treasure trove full of potential challenge ideas)
A snake is made up of segments of same length and the connection between each segment can be ...
12
votes
3answers
1k views
Is that word Feminine or Masculine?
Write a program or function that takes in a single string containing only lowercase a-z, and prints or returns a truthy value if the word is the feminine version of the thing it represents and a falsy ...
46
votes
7answers
7k views
Is this even a word?
Your should write a program or function that takes a 4-character string as input and outputs a value indicating if the string is an English word or not. You are allowed to make mistakes in 15% of the ...
19
votes
3answers
2k views
Distinguish between Masculine and Feminine Nouns in French within 100 characters
You are to write a very small program within 100 characters. Your program must distinguish between masculine and feminine french nouns. The output should be un if it is masculine and une if it is ...
25
votes
1answer
1k views
Voice recognition: “Yes” or “No”?
Task
Implement a program in minimum bytes of source or binary code that does voice recognition of a voice sample (me saying "yes", "yeah" or "no" in voice or in whisper, plainly or quirkily) based on ...
