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A competition to solve a particular problem through the usage and manipulation of strings.

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35 votes
6 answers
12k views

Balance chemical equations!

Bernd is a high school student who has some problems in chemistry. In class he has to design chemical equations for some experiments they are doing, such as the combustion of heptane ...
FUZxxl's user avatar
  • 10.1k
12 votes
27 answers
2k views

Removing unique elements from string

I came upon this question, because it seems to be very common use-case to find unique characters in string. But what if we want to get rid of them? Input contains only lower case alphabets. Only ...
user14742's user avatar
  • 239
16 votes
28 answers
2k views

Shorten text with Run Length Encoding

Shorten (or not) text using run length encoding Input: heeeello woooorld Output: 1h4e2l1o 1w4o1r1l1d Read lines from stdin. Print to stdout. Stderr is of course discarded. Assume there are ...
mroman's user avatar
  • 1,528
19 votes
30 answers
3k views

Print custom alphabet

The Challenge Display the alphabet from a given letter read from console input. If the letter is uppercase, you have to display the alphabet uppercased. The alphabet printed must end in the precedent ...
Averroes's user avatar
  • 4,107
5 votes
7 answers
501 views

Finding variables in code

Given some code in your language as a string, find and display all the variable names. Examples in pseudocode: ...
beary605's user avatar
  • 4,350
5 votes
6 answers
887 views

Detecting loops in in in strings

Given a string, mark which parts in the string repeat in box brackets, and write how many times it does so before the box. Example:st st st Hello ThereThere ...
beary605's user avatar
  • 4,350
26 votes
17 answers
2k views

Topographic Strings

Here is some example input, so I can explain what the problem is: ((1 2)(3 (4 5) moo)) (i (lik(cherries)e (woohoo))) Think of this line of text as a topographic ...
beary605's user avatar
  • 4,350
15 votes
38 answers
5k views

Remove vowels without using too many different characters

The challenge is to remove vowels (a, e, i, o, u) from string from STDIN (yes, I know, simple). You can expect that your program will be not ran with any arguments in ...
null's user avatar
  • 12.1k
75 votes
122 answers
17k views

Print the alphabet without using each vowel

Inspiration: in 1939, a man named Ernest Vincent Wright wrote a novel called Gadsby without using the letter 'e'. Your task is to write a set of (up to 5) programs in any language (which has a text-...
shamp00's user avatar
  • 1,261
29 votes
69 answers
8k views

Is string X a subsequence of string Y?

Given strings X and Y, determine whether X is a subsequence of Y. The empty string is regarded as a subsequence of every string. (E.g., '' and ...
r.e.s.'s user avatar
  • 3,132
17 votes
11 answers
8k views

Find the minimum edit distance between two strings

Explanation The edit distance between two strings is a function of the minimum possible number of insertions, deletions, or substitutions to convert one word into another word. Insertions and ...
Peter Olson's user avatar
  • 7,732
2 votes
3 answers
181 views

all occurences of each line from a file in another file for each line in the first file

This is a code golf problem: Say you have two files, one file s and one file h. The problem is that for each line l of s you should produce a list that contains all lines of h that contain l. By "...
Wes's user avatar
  • 121
5 votes
4 answers
592 views

Implement Oplop

Oplop is an algorithm to generate website specific passwords based on a master password and a keyword. It is described here: http://code.google.com/p/oplop/wiki/HowItWorks There's an online ...
skeevey's user avatar
  • 4,365
11 votes
8 answers
1k views

ASCII ruler generation

The challenge is to generate an ASCII character count ruler in the following format: ...
user2398029's user avatar
-2 votes
2 answers
3k views

Conversion to palindrome with minimal points used

Input: a word (2-100 characters) Convert this word to a palindrome: delete character - 13 points add character - 12 points increase character - 5 points ('d' > 'e') decrease character - 4 points ('n'...
e-MEE's user avatar
  • 123
7 votes
1 answer
713 views

String manipulation

The challenge is to manipulate strings using basic Vim-like commands Input: A string of text to be transformed. The input alphabet is [a-z]. A string of legal commands Output: The transformed ...
Pubby's user avatar
  • 1,249
54 votes
49 answers
26k views

Outputting ordinal numbers (1st, 2nd, 3rd)

I would like to generate (as a return result of a function, or simply as the output of a program) the ordinal suffix of a positive integer concatenated to the number. Samples: ...
Nicole's user avatar
  • 643
22 votes
24 answers
2k views

Find columns where all characters are the same

I came across this question on SO and thought it'd make a nice golf challenge. So here it is: Challenge: Write a program that reads a sequence of character strings, one per line, and outputs a list ...
Ilmari Karonen's user avatar
22 votes
9 answers
11k views

Generating PBM bitmap files from ASCII text

The PBM (Portable BitMap) format is a very simple ASCII black and white bitmap format. Here's an example for the letter 'J' (copy-pasted from the wikipedia link): P1 # This is an example bitmap of ...
ChristopheD's user avatar
  • 1,709
4 votes
14 answers
1k views

Write the shortest code to match a tail-repeating string where one character falls off the head in each repetition

In this code-golf, you will attempt to match a string that is tail-repeating with one character falling off the head on each iteration. The code needs to be able to accept a string, and return to the ...
Thomas Dignan's user avatar
-8 votes
8 answers
1k views

Smple way to get min & max

You will take a set of input numbers, and output the minimum and maximum of the set. You can either write two programs, with 1 program doing each function, or one combined program. Here's an example ...
linuxrules94's user avatar
11 votes
11 answers
3k views

Check if a string is a shuffle of twins

Explanation Two strings can be shuffled by interspersing their letters to form a new string, much like two piles of cards can be shuffled to form a single pile. For example, the strings ...
Peter Olson's user avatar
  • 7,732
4 votes
2 answers
1k views

Decompose a String

Challenge You are to write the shortest complete program that takes a string as input from STDIN and decomposes it as far as possible, and prints the composition to STDOUT. To decompose a string, ...
PhiNotPi's user avatar
  • 29.1k
15 votes
9 answers
4k views

Write a function that returns past tense of given verb

Challenge Write a function which takes an argument which is a verb, and returns the past tense of the verb. (Assume that the verb is regular) Past tense Note: consider y as neither consonant nor ...
JiminP's user avatar
  • 3,452
9 votes
7 answers
1k views

Program to Spoonerise words [duplicate]

A spoonerisation is swapping the first letter/pronounceable syllable of two or more words. Example: A lack of pies = A pack of lies. Bad salad = Sad ballad (ish) :) Challenge: Write a program to ...
Alex Coplan's user avatar
59 votes
82 answers
8k views

How to randomize letters in a word

According to some controversial story, the odrer of ltteres in a wrod deos not mttaer much for raednig, as lnog as the frist and lsat lteter macth with the orignial wrod. So, for fun, what would be ...
Tomalak's user avatar
  • 941
13 votes
9 answers
847 views

Soundex function

Write the shortest function to generate the American Soundex code for a surname only containing the uppercase letters A-Z. Your function must produce output consistent with all the linked page's ...
PleaseStand's user avatar
  • 5,607
17 votes
17 answers
4k views

Indent a string using given parentheses

Given the following input to the program: List of block start characters List of block end characters A string to format format the string with the blocks delimited by the two character sets ...
Prashant Bhate's user avatar
10 votes
5 answers
743 views

Simple Tag Parser

This is a model of a forgiving HTML parser. Instead of parsing HTML and extracting attributes, in this code golf, the tag parser will be simple. Write a function that parses a tag structure and ...
Ming-Tang's user avatar
  • 5,989
50 votes
80 answers
8k views

Answer to life, the universe, and everything

Task Given a String as input, your task is to output 42 only if the input String happens to be exactly the following : ...
Mateen Ulhaq's user avatar
  • 1,973
22 votes
49 answers
2k views

Detect rotated strings

Read two strings from stdin. Output Yes if one string is a rotated version of the other. Otherwise output ...
gnibbler's user avatar
  • 15.1k
94 votes
163 answers
13k views

Determine whether strings are anagrams

Challenge Given two strings, work out if they both have exactly the same characters in them. Example Input word, wrdo This returns true because they are the ...
Tom Gullen's user avatar
  • 1,249
-3 votes
9 answers
405 views

Mixed up output [duplicate]

Write a function or program that outputs the following lines <input> time: ...
Eelvex's user avatar
  • 5,502
8 votes
1 answer
1k views

Random Sentence Generator

Write the shortest program you can in any language that reads a context-free grammar from and the number of sentences to produce from stdin, and generates that many ...
Hoa Long Tam's user avatar
  • 2,092
12 votes
15 answers
726 views

Finish a symmetrical map

You are given one-quarter of a map that is symmetrical over the x- and y-axes as input. The program should print the complete map. The map can contain the following characters: ...
user avatar
20 votes
39 answers
2k views

Sum of integers in string, separated by non-numericals such as 'a' and 'Y'

Create a program which sums all integers found in a string which is set as a variable in the program (thus, the program doesn't have to handle any input). The integer numbers are separated by non-...
Anto's user avatar
  • 511
24 votes
20 answers
2k views

Chris Pine's "Deaf Grandma"

I'm a mentor at RubyLearning and one of the exercises we give to our students is the "Deaf Grandma" exercise from Chris Pine's book "Learn to Program". Here's the description: Write a Deaf Grandma ...
Michael Kohl's user avatar
67 votes
140 answers
12k views

Reverse stdin and place on stdout

Requirements: Take an input on stdin including new lines / carriage returns of unlimited length (only bounded by system memory; that is, there is no inherent limit in the program.) Output the reverse ...
Thomas O's user avatar
  • 3,348
28 votes
37 answers
3k views

Finding "sub-palindromes".

The shortest code that finds all unique "sub-palindromes" of a string, that is: any substring with length > 1 that is a palindrome. eg.1 ...
Eelvex's user avatar
  • 5,502

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