Questions tagged [string]
A competition to solve a particular problem through the usage and manipulation of strings.
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Human oriented string comparison
Traditionally when you compare two strings you use lexicographical comparison. That can be described by the recursive algorithm:
$$
f(x, y)=
\left\{\begin{array}[rr] \\
\mathrm{EQ} & \mathrm{if}\,\...
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Sum of numbers of arbitrary length
Your function must accept 2 strings which are correct numbers. It needs to sum them up (without rounding and floating point errors) and return the result (which is also a correct number) without any ...
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Salacious Bacon Tripod
In a certain chatroom, we like making acronym jokes about the build tool we use called sbt. While it usually stands for "Scala Build Tool", we aim to come up with all sorts of meanings, such ...
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Parse basic arithmetic into an AST
Introduction
An abstract syntax tree (AST) is a tree of tokens that shows their connection to each other and syntactical meaning. They are commonly used in compilers and static analysis tools, as ...
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Find the length of the longest substring with all different characters in O(n) time
Let's solve the same task as in this challenge but faster!
Input: a non-empty string containing letters a-z
Output: the length of a longest (contiguous) substring in which all letters are different
...
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Change the subject
Sometimes I feel like the conversation is going down the wrong path and take it upon myself to steer it in another direction. And this conversation is going wrong real fast, so I need to change the ...
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Guess the song title
I have this problem where I listen to so much music that I can never remember what songs are called. But even if I remember the lyrics, I won't always know the song's name. But lucky for me, there's a ...
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Remove duplicates from my academic transcript
Consider a list of subject, grade pairs. E.g.
...
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Division between two strings
Inverse function of this challenge
To (properly) multiply an string by an integer, you split the string into characters, repeat each character a number of times equal to the integer, and then stick ...
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Wordle games without repeating letters
Given a word list, find all sets of five words of five letters each, such that the words of each set have 25 distinct letters in total.
This challenge was inspired by this video by Matt Parker.
...
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Is it true? Ask Pip!
Title is an homage to this classic challenge
In Pip, the Scalar data type encompasses strings and numbers. A Scalar value is truthy in most cases. It is falsey only if:
It is the empty string ...
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Parse WebSocket frames
According to MDN, every WebSocket message is sent as one or more frames. Your job is to extract the payload given a (masked) client-to-server text frame. The steps to extract the payload is as follows:...
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Flip the order of operations
Scientists have made contact with a parallel universe. Just one problem: They write math differently. Help the scientists make a program that can convert normal math expressions to their equivalent in ...
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Keep elements in sequence that have a letter repeated at least 3 times
Challenge:
Given the input array l with a list of strings, only keep the elements in the sequence that have a letter that's repeated at least 3 times. Like ...
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Replace 0s In a String With Their Consecutive Counts
Challenge
Given a string of any length which contains only digits from 0 to 9, replace each consecutive run of the digit ...
user113990
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Replace all vowels with repeated "aeiou"
Let's say I have this string:
s = "Code Golf! I love Code Golf. It is the best."
I want to replace all the vowels with repeated "aeiou".
Notes:
...
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CGAC2022 Day 20: Reconstruct Santa's Book
Part of Code Golf Advent Calendar 2022 event. See the linked meta post for details.
Oh no, Santa spilled wine all over his great book. Now most of the letters are illegible. How will Santa now know ...
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Make every consonant after a vowel uppercase
I have a string like this:
s = "helloworldandhellocodegolf"
I want to make every consonant after a vowel uppercase.
Desired output:
...
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Sorted strings filter
Input a list of strings a and a string s for search keyword. Find out all strings in a which ...
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Clutch Wordle solver with known inputs
Sometimes when you're playing Wordle, you get to your fifth guess and you can't figure out the word any more, so you start mentally running through the list of remaining iterations, both sensical and ...
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CGAC2022 Day 12: Santa's gift and the laser lock
Part of Code Golf Advent Calendar 2022 event. See the linked meta post for details.
There's a good news and a bad news.
Good news: you got a Christmas present from Santa. (Already?! Christmas is two ...
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CGAC2022 Day 10: Help Santa sort presents!
Part of Code Golf Advent Calendar 2022 event. See the linked meta post for details.
Santa likes to sort his presents in a special way. He keeps "uninterleaving" the pile of presents into ...
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Join Columnar Strings
Write the shortest possible program or function that will join a list of columnar strings.
For this challenge, columnar strings are defined as one-character-wide strings spanning across multiple lines....
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Range of ASCII values
Your task
Given a string, output the range of ASCII values.
Example
Let's say we have the string Hello.
We get the ASCII values:
...
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Shortest path between two directories
The challenge is to write a program which will find the shortest (least number of characters) command which will navigate to a target directory, given a starting directory, assuming a standard linux ...
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Fastest code: Does a list of string contains %s, %d, %f, or %r?
The aim is to create an algorithm to detect that one of the string in a small list of strings contains %s, %d, ...
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Rarity of a String
Input: A string
Output: The rarity of the string, as described below.
To find the rarity of a string, follow the steps below.
Start with 0.
Subtract 3 for each E, A, T, or O in the string.
Subtract 2 ...
user115674
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Number to letters
Your task
Given a numerical string or integer \$\ge 0\$ (which may have leading zeros), convert it to letters using the below rules.
Rules
Loop through the digits:
If the digit is ...
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Implement Casio's M
The task
Most Casio calculators featured a variable M, which has 3 operators related to it: M, ...
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LS, Part 1: Ana Gram
Warning: Wouldn't you rather answer a challenge about ponies?1
If you have read The Hostile Hospital, you would know that the Baudelaire orphans, from one of the scraps of paper recovered from the ...
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Check if my input was 'hi whats up' without using any of those letters in your code
Write a script, program or function which takes one input of type string and outputs or returns some sort of indication wether the input string was 'hi whats up' (without the apostrophes) or not.
You ...
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Maximum average ord
Your task
Take a list of strings as the input, and output the maximum average ord.
Example
Given the list ...
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Is this series of quotes valid Python?
Python string parsing has quite a few edge cases. This is a string:
"a"
Putting 2 strings immediately after each other implicitly concatenates them, so ...
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Remove the last 'n' occurences of a substring from a string
Given a string and a substring and a positive integer n.
Remove the n occurences of a substring from the end of the originally ...
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Character insertion on letterboards
You know those letterboards outside old-style cinemas which show upcoming films - perhaps you have a miniature one in your home?
If you've operated one, you'll know that you can normally add letters ...
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Alphabet Checksum
Your task
Given a string of lowercase letters, output the "alphabet checksum" of that string, as a letter.
Example
Let's say we have the string "helloworld". With ...
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Box blur the string
Box blur is a simple operation for blurring images. To apply box blur, simply replace each pixel with the average of its and the surrounding 8 pixels' values. Consider, for example, the following ...
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Is it an alphadrome?
An alphadrome is a word in which each letter in the first half of the word "reflects" its alphabetical "opposite" in the second half of the word. Write a program or function that ...
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Make a Court Transcriber
Discussion in courtrooms often occurs at a high speed and needs to be accurately transcribed in case the text of the decision is needed in future cases. For this purpose, the stenographers who ...
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Number to String in aaaaa way!
In this challenge, you are going to take a number and turn it into a string, but not in the common way. You will use the aaaaa way!
The ...
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Hexadecimal -> Binary Art
Take a list of 2-digit hexadecimal numbers as input, and output the binary value, replacing each 1 with an 'X', and each 0 with a space.
For example
Input = ...
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Numbers vs. Strings: Language fitness challenge
inspired by thejonymyster's idea
Rules
This challenge is about finding languages that are very suitable for one task but quite the opposite in the other. The two tasks share a theme, but Task 1 is ...
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Write "tut-tut-tut" without using "tut"
Following this question: Tut-tut-tut-tut-tut
Write a program that writes "tut-tut-tut" without using the characters "t", "u" or "-" in the code itself.
This is ...
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Re-name all identifiers to a single letter
Imagine a very simple language. It has just 2 syntax features: () indicates a block scope, and any word consisting only of 1 or more lower case ASCII letters, which ...
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Tut-tut-tut-tut-tut
The string tut-tutut-tut-tuttut-tut can be constructed with overlapping or concatenated instances of the word tut-tut:
...
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Does there exist a synchronizing word?
A complete deterministic finite automaton is a machine, with some states. Each state in the automaton has, for each character in the alphabet, a pointer to a state (not necessarily a different one). ...
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Change the quotations as if in Microsoft Word
I noticed that in Microsoft Word, single quotations are either ‘ or ’, but not in Notepad. Your task today is: given a string <...
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Divisor of a string
Challenge
Given a positive-length string \$S\$, a divisor of \$S\$ is another (not necessarily distinct) string for which there exists a number \$a\$ such that when we repeat the divisor \$a\$ times, ...
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Add parentheses to Polish notation
In most programming languages, arithmetic is written with infix notation -- i.e. the operator is put in between the operands -- e.g. 1+2. In contrast, with Polish ...
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Python: can I shorten this code further for checking substrings
So the golf question was like this:
You are given a number T and then a total of T number of 17-character strings. For each of ...
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