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

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7
votes
13answers
275 views

Convert a string of binary characters to the ASCII equivalents

Take a string of binary characters separated by a space, and convert it to an ASCII string. For example... 1001000 1100101 1101100 1101100 1101111 100000 1010111 1101111 1110010 1101100 1100100 ...
1
vote
2answers
157 views

Write an IBAN validator

Write a program (the body of the function is enough) that accepts a string of alphanumeric characters and validates it according to ISO 13616:2007. The algorithm for validation is (source: wikipedia ...
-1
votes
3answers
156 views

Output a non-Context-Free Language [closed]

Your challenge is to write a program which will output a non-context-free language. A Context-free Grammar is a series of replacement rules, describing which symbols can be replaced by which other ...
10
votes
5answers
488 views

Reduce html to n characters while keeping the formatting

Almost every language has a built-in function that can split a string at a given position. However, as soon as you have html tags in the string, the built-in function will not work properly. Your ...
36
votes
35answers
5k views

ETAOIN SHRDLU golf

Short and sweet description of the challenge: Based off ETAOIN SHRDLU, your challenge is to write the shortest program or function in any language that outputs the 26 letters of the English alphabet ...
8
votes
2answers
395 views

Apply English punctuation rules

You've been hired to write some code for a dictation-taking app, which takes voice input from a spoken source, parses it as words, and writes it down on a screen. The management doesn't really trust ...
64
votes
11answers
16k views

I am passive aggressive and want to insult my boss without him finding out

It's been a rough few months at work and I feel like I just want to scream right to my boss' face. I am, however, not one to directly confront people I have a problem with. I also don't want to lose ...
8
votes
18answers
939 views

Check for occurences of string in other string

Challenge I'm sure you read the title, and came in to farm your rep, thinking its kids' stuff, but think again! You have to challenge each other in the shortest code to count the occurences of a ...
32
votes
37answers
6k views

The shortest code to invert a binary string

Me thinks there aren't enough easy questions on here that beginners can attempt! The challenge: Given a random input string of 1's and 0's such as: 10101110101010010100010001010110101001010 Write ...
8
votes
4answers
609 views

Generate keyboard shortcuts for a menu

Menu Shortcuts Traditionally, user menus are accessible by keyboard shortcuts, such as Alt + (a letter), or even simply hitting the letter when all textboxes are unfocused (gmail style). Your task ...
30
votes
3answers
2k views

Regex that only matches itself

There are some pretty cool challenges out there involving regex (Self-matching regex, Regex validating regex) This may well be impossible, but is there a regex that will ONLY match itself? NOTE, ...
18
votes
5answers
1k views

Leet to English Translation

Leet to English Translation Your challenge is to write a program to translate (English) leetspeak/lolspeak/txtspk into normal English. Your program should read from standard input and output to ...
4
votes
28answers
1k views

Implement an integer parser

Implement an integer parser in the shortest code possible, with the following restrictions: The function or program can only take one argument: a string (or equivalent). Assume it to be signed and ...
19
votes
17answers
2k views

How many IP addresses are in a given range?

Inspired by... http://programmers.stackexchange.com/questions/241402/how-can-i-work-out-how-many-ip-addresses-there-are-in-a-given-range Write a program or function that takes two strings as input, ...
18
votes
5answers
905 views

World IPv6 day 2014

To mark the anniversary of World IPv6 day, the Internet Society has published a campaign to Turn Off IPv4 on 6 June 2014 for One Day. IPv6 addresses may be represented in their long form as eight ...
-2
votes
11answers
376 views

Code Golf: Create a string of 100 of the same character [closed]

The problem is to create a string of the same character repeated 100 times in as short a statement as possible. One potential solution is: var i = 100, s = ''; while(i--) s += "Z"; I'm looking ...
1
vote
19answers
718 views

Count how many characters are in the program's source

Write a program that counts and prints the number of characters in it's own source code to standard output. The number must be generated from counting the characters. This Ruby solution would not be ...
-4
votes
4answers
293 views

print text with no chars [closed]

Mission is write a program that prints "Hello World!". Simple? Text must be human readable and should not be "|-| € |_ |_ 0 // 0 |? |_ |) \./" or something like that Program should not contain: ...
17
votes
8answers
1k views

One Letter Swap

The largest forum on the web, called postcount++ decided to make a new forum game. In this game, the goal is to post the word, but the word has to have one letter added, removed, or changed. Your boss ...
-6
votes
1answer
99 views

Dealing with boolean strings [closed]

you have the following or similar string : () || () || { () || () } && () || { () && () } || and && are used as operators. () indicates of an boolean of that matter.(true or ...
14
votes
31answers
935 views

Shortest program to split a string at non-digits without RegExps

EDIT: If you're using Lisp, I have given some guidelines at the bottom in counting bytes. Objective: Make the shortest function that splits a string at non-digits and returns an array consisting of ...
9
votes
23answers
1k views

Print a string with vertical words

Your task is to take an input string of ascii characters and output the string as a series of vertical words separated by spaces. An example is shown below: Given the string: Hello, World! My name ...
11
votes
8answers
1k views

Is it a prime? w/o math

Write a program or function in any language that tells if the input is a prime number. The input is a string representing a natural number in base-10. The output is one of the two strings "Prime" or ...
14
votes
1answer
787 views

Create a C preprocessor

The goal is to create a preprocessor for the C language, as small as possible in terms of source code size in bytes, in your preferred language. Its input will be a C source file, and its output will ...
6
votes
17answers
764 views

Write a program for splitting the string with alternative spaces

Want to write a program in minimum number of code,all programming language accepted Runtime criteria also challanged Example: Input : abcdef Output: a b c d e f ab cd ef abc def ...
9
votes
10answers
504 views

String of alphanumeric characters to a sorted list of comma-separated ranges

Given a string of unsorted alphanumeric characters, e.g. ABC321STPpJqZZr0 output a ", "-separated list of character ranges, sorted by ASCII value, ignoring case and removing duplicates (i.e. ...
3
votes
7answers
309 views

Longest Common Subsequence of Two Strings containing a particular Substring

A subsequence is a sequence that can be derived from another sequence by deleting some elements without changing the order of the remaining elements. Given three strings A, B and C (note the order) ...
4
votes
10answers
485 views

Golf an LZW encoder

Given an alphabet and a string, your job is to create the Lempel–Ziv–Welch compression of the string. Your implementation can either be a function with two parameters and a return value, or a full ...
7
votes
6answers
269 views

Determine whether a car can get around a route with a limited amount of gas

Using any programming language that supports functions, have the function is_enough(strArr) that take strArr which will be an an array consisting of the following elements: N which will be the ...
-5
votes
2answers
190 views

Shortest code to reverse a string [duplicate]

The winner will be the one to use the shortest code to reverse this string: Today there was two clouds in the sky, each forming a shape. It may be in any programming language.
2
votes
2answers
276 views

Hide one message inside another

Your task is to hide a small message or string inside a larger block of text. To do so, you must hide the message as capital letters inside the larger For the quoted test: Lorem ipsum dolor ...
1
vote
0answers
81 views

palindrome detection palindrome [duplicate]

Write a function with a single string parameter and a boolean return value. The function should return true iff the string is a palindrome character-wise. Alternatively, write a program that reads a ...
47
votes
31answers
13k views

All Your Base Are Belong To Us (Restricted)

Input must not be required, and output must read "All your base are belong to us". Restrictions No external resources. Plus a minimum of two of the following: You cannot use "a", "b", "t", "u", or ...
21
votes
4answers
840 views

9-hole mini-golf: Text Manipulation

9-hole mini-golf: Description 9 (mostly fairly easy) code golfing challenges of varying difficulty Penalties for using the same language more than once All challenges about a specific theme (this ...
10
votes
3answers
220 views

Expand tabs (implement expand(1))

Your task this time is to implement a variant of the POSIX expand(1) utility which expands tabs to spaces. Your program is to take a tabstop specification and then read input on standard in and ...
17
votes
19answers
3k views

Hello world!!! Fibonacci distribution

Your program should output exactly: Hello world!!! with or without linefeed after. Your program should take no input. Sourcecode character distribution must be correct according to: The number of ...
4
votes
12answers
568 views

Shortest string expressions stable under deleting quotes

Forgetting quotes can lead to certain problems. For example, in Scala the two expressions: "("+("+")+(")+(")+")" ("+("+")+(")+(")+") differ only in starting and ending quotes, but they ...
5
votes
1answer
244 views

Manipulate “RELATIVE” using 8 OP-codes

Rules: Your program can be in any programming language. Your program should not take any input. Your program should transform the word "RELATIVE" into "STATIC". The word can at any stage only ...
13
votes
4answers
550 views

Syntax Highlighting for Greater Golf!

Golfers. Together, we have banded together to produce code that is concise, is functionally beautiful and is uglier then the Phantom of the Opera from the original novel. The time has come for us to ...
4
votes
4answers
164 views

printf-style string formatting

Challenge Write a function that implements C printf-style string formatting. Rules You must implement at least %%, %c, %s, %d and %f. You must not use a built-in string formatting method. You must ...
5
votes
4answers
398 views

Cardinal Numbers in Standard American English

Let n be any integer between 1 and 999,999 inclusive. Your challenge is to write a complete program which using stdin or command-line arguments takes in n and outputs the number of times the letter ...
15
votes
17answers
1k views

Capitalize String

Given a string, capitalize it. By capitalization I mean conTeNT-lENgth changes to Content-Length. In the example I showed the string with 2 words with - as the word boundary. However I expect you to ...
-1
votes
1answer
298 views

Compressing a DNA-like string [closed]

my app is multiple choice test, where for each question the response results in a 4 letter string "eg" GTAC or ATGC or CATG, etc. There are always just 24 questions. so the final result is something ...
-1
votes
4answers
573 views

Find the longest word in a sentence without using regex [closed]

Have a function LongestWord(sen) take the sen parameter being passed and return the largest word in the string. If there are two or more words that are the same length, return the first word from the ...
-3
votes
2answers
250 views

Decode obfuscated Hello world [closed]

In the following string (number), there is an hidden message, the goal of this is to find how this message is encoded write the shortest code that permit to retrieve the original message. The only ...
7
votes
5answers
709 views

Given a string find the substring which appears most often

Write a complete program (not just a function) which using stdin takes in a string of arbitrary length (assume string-length at least one) composed only of digits 0-9 and outputs using stdout the ...
5
votes
26answers
802 views

Run Length Decoding

Write the shortest code in the language of your choice to perform run length decoding of the given string. The string will be supplied as input on stdin in the form CNCNCNCNCNCNCNCN where each C ...
0
votes
3answers
933 views

javascript: smallest code to convert seconds to time [closed]

Given seconds like 11728, write the smallest javascript function that returns a string like 3hrs. 15min. 28sec. signature textTime([int] t,[bool] z,[bool] m) t is the time like 11728 and you can ...
4
votes
11answers
569 views

Replace letters by their rank, keeping punctuation intact

The problem is simple. Given a string such as "Hello World" the program would output "8-5-12-12-15 23-15-18-12-4-!". Any delimiters will do, (please specify what they are though) I just chose to use ...
6
votes
3answers
461 views

Parse a Python string literal

The challenge is to parse a string like Python does and print the contents of the string. Input (command-line argument or stdin): a string literal (e.g. "hello") (or multiple literals, see string ...