Questions tagged [subsequence]
Challenges pertaining to a sequence within a larger sequence
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Backronymiser឵឵
Background
A backronym is an acronym that was formed from an existing word. For example, spam is actually named after the canned meat product as used in the Monty Python sketch, but can be ...
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Make the list Fibonacci-like
Related, but not dupe.
Challenge
A list of integers \$a_1, a_2, a_3, \dots, a_n\$ (\$ n ≥ 1 \$) is Fibonacci-like if \$a_i = a_{i-1} + a_{i-2}\$ for every \$i > 2\$. Note that every list that ...
- 1,017
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Shortest restricted superstring
Given two sets of strings, \$ D \$ and \$ R \$, find the shortest string which contains every string in \$ D \$, but contains none of the strings in \$ R \$.
There are almost always multiple possible ...
- 22.6k
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Optimally break a string into words
Given a string, like potatocarrot, break it into the smallest number of substrings possible. These substrings can consist either be a single character, or one of a ...
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Is it a fibonacci-like sequence?
The Fibonacci Sequence is a sequence of positive integers where the first two elements are 1 and the rest are the sum of the previous two. It begins \$1, 1, 2, 3, 5, 8, 13\$ and continues forever.
But ...
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All sequences as substrings
Make a program that outputs a sequence of integers so that every finite sequence of positive integers is a substring (continuous subsequence) of the output.
For example, the following sequence ...
- 6,775
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How many laps around the permutation?
Your input is an array of numbers: a permutation of \$\{1, 2 \dots n\}\$ for some integer \$n \geq 2\$.
How many times must you repeat this list before you can "pick out" the numbers \$[1, 2 ...
- 66.2k
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Output every sublist ... eventually
You will be given as input an infinite stream of positive integers.
Your task is to write a program which outputs an infinite sequence of lists with two requirements:
All lists in the output are ...
- 90.2k
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Shuffle a subsequence
Thanks to rak1507 for the suggestion
"Random" in this challenge always refers to "uniformly random" - of all possible choices, each has an equal chance of being chosen. Uniform ...
- 48.1k
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Check if the string is reshaped
Challenge
Given an input string X, determine if X can be obtained from reshaping a strict prefix of itself (a prefix that is not ...
- 2,555
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AoCG2021 Day 2: Naughty or nice?
Part of Advent of Code Golf 2021 event. See the linked meta post for details.
The story continues from AoC2015 Day 5, Part 2.
Santa needs help figuring out which strings in his text file are naughty ...
- 66.1k
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Even sum subarrays
Given an array of integers, count the number of contiguous subarrays with an even sum. You may assume that the array is non-empty, and contains only non-negative integers.
This is code-golf, so the ...
- 18.6k
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Park, Lake, Santa Fe [closed]
Given a long multi-sentence string, the goal is the count the occurrences of the following words: park, lake, ...
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Longest Zero Sum Sub-array
Given an array of integers. Find out its longest sub-array (contiguous subsequence) whose sum is 0.
The sub-array for output may be an empty array.
Input
Input an array of integers.
Output
Output the ...
- 30.8k
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Is there a single straight line in the matrix?
Inspired by Wzl
Determine if a given square binary matrix has exactly one row or column consisting of entirely 1s, and the rest of the matrix is ...
- 48.1k
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Guide my eyes in the right direction
Inspired by this: http://nolandc.com/smalljs/mouse_reveal/ (source).
A valid answer:
Takes a number
\$w\$ and (assumed non-negative) integer \$x\$.
Starts with an integer list with a length of \$2^w\$...
- 1,450
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Did I die or not?
Given a permutation of the alphabet and an intended "word", determine if the word was guessed in a game of Hangman, where the permutation is the list of guesses.
For example, given ...
- 48.1k
14
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What's my TIO uniqueness?
Try it online! currently has 680 listed languages, all of which are searchable. For most of those languages, when searching for it, you don't have to enter the entire string. For example, entering <...
- 48.1k
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Check if B is composed of substrings of A of length n
Given two strings \$ A \$ and \$ B \$ and a positive integer \$ n \$, determine whether \$ B \$ is composed entirely of (possibly overlapping) strict substrings of \$ A \$ of a length of at least \$ ...
- 22.6k
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cadaddadadaddddaddddddr - linked list accessing
Create a function (or closest equivalent, or full program) that takes an list of some datatype (your choice) that may be nested and a string (in either order), and generalizes the lisp c[ad]+r ...
- 1,450
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13
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Count strictly overlapping substrings
Given two strings a and b, count how many times b occurs as a substring in ...
- 22.6k
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Speed of Lobsters
From the subreddit r/SpeedOfLobsters:
Edit the text of an image to create a new phrase
This meme format/style is pretty self-explanatory. Simply have a browse through the subreddit if you need more ...
- 48.1k
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Vandalizing Marquees
A marquee is a low-tech board that allows customizable letters. For example, here is a marquee:
SALE ON SNEAKERS
However, someone might come along and vandalize it ...
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The Fibonacci Rectangular Prism Sequence
What is the Fibonacci Rectangular Prism Sequence?
The Fibonacci Rectangular Prism Sequence is a sequence derived from the Fibonacci sequence starting with one. The first 3 numbers of the Fibonacci ...
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Even-Odd chunks
(Inspired by the Keg utility of this challenge)
Given a non-empty input string, e.g. s c 1= e(a"E"), split the input into even-odd chunks.
Example (Feel free to ...
user85052
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votes
2
answers
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How many ways can given subsequence occur in given sequence?
Let me know if this task has already been posed. I haven't found it when I looked.
Input
master sequence \$\ X = x_1\dots x_n\$: sequence of characters, eg. \$\rm international\$
subsequence \$\ Y = ...
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Is it a circumfix?
Introduction
We all know prefixes and suffixes. But there are other types of affixes that exist too. Such as circumfixes, a type of affix that has two parts, one of which is a prefix and another of ...
- 3,615
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votes
27
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Length-terminated sequences
We all know the age-old debate - should strings be length-prefixed or should they be null-terminated? Well, you've run into a blob of binary data and apparently whoever made it decided that the best ...
- 3,615
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Where are they calling from?
When making phone calls internationally, phone numbers are prefixed with a code indicating what country the number is located in. These codes are prefix codes, meaning that no code is a prefix of ...
- 3,615
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votes
2
answers
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Highest cardinality grouping of contiguous integers with minimum-sum threshold
Challenge
Given an array of positive integers and a threshold, the algorithm should output a set of consecutive-element-groupings (subarrays) such that each group/subarray has a sum greater than the ...
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answers
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Determine if a grid contains another grid
Challenge
Create a function takes in two 2-dimensional arrays of characters (or strings if the programming language does not have characters as a datatype) as inputs: a and b. If your language does ...
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Greatest common substring
Create a program or function which takes a list of strings as input, and outputs the longest string that is a substring of all input strings. If there are several substrings of equal length, and no ...
- 3,615
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votes
29
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Make me a metasequence
Background
For this challenge, a 'metasequence' will be defined as a sequence of numbers where not only the numbers themselves will increase, but also the increment, and the increment will increase by ...
- 2,309
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votes
0
answers
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Pattern Finder - Find Repeated Pattern in String [closed]
Introduction
This is a little challenge with the goal of identifying repeated pattern "blocks" in a string, and outputting them with their frequency of occurence from left to right.
A friend ...
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Most contributing rows
Given a non-empty matrix of non-negative integers, answer which unique rows contribute most to the sum total of elements in the matrix.
Answer by any reasonable indication, for example a mask of the ...
- 28.3k
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Playing with the musical turtle
My two kids like to play with the following toy:
The colored areas with the shapes inside can be touched and the turtle then lights the area and plays a sound or says the name of the color or the ...
- 12.6k
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answers
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Longest Repeating Subsequence of a Single Digit
Challenge:
Given a positive integer, output the longest single-digit subsequence that occurs at least twice, AND has boundaries of another digit (or the start/end of the integer).
An example:
Input: <...
- 108k
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Indent your code according to Fibonacci
Okay, so I saw this in a meme and decided it'd be the perfect code golf challenge:
I prefer to increase the side of my indents according to the Fibonacci sequence:
...
- 11.3k
10
votes
8
answers
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Codegolf Rainbow : Sorting Colors with Reflection
Introduction:
After I posted two rainbow-related challenges: Codegolf Rainbow : Fun with Integer-Arrays 1 and Codegolf Rainbow : Draw in Black-and-White 2, the following comment was made by @ChrisM in ...
- 108k
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Subset Sum Orderings
A set of n positive numbers has 2^n subsets. We'll call a set "nice" if none of those subsets have the same sum. ...
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8
answers
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Indexing Cha-Cha Slide
Introduction:
Although I originally had a Dutch song in my head, where the lyrics are: "Doe 'n stapje naar voren, en 'n stapje terug" (which translated to "Take a little step forward, and a little ...
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The Ever-Increasing Graph
Consider a one-dimensional sequence of numbers within a fixed range, i.e.
[1, 2, 4, 6, 8, 0, 2, 7, 3] in range [0, 10⟩
The Ever-Increasing Graph* ** is a line ...
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5
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ID generator with no matching contiguous pairs
Given 2 inputs (m=minimum starting id, n=number of ids), generate a sequential list of ids, starting at >=m, made up of the digits 0-9 where no 2 contiguous numbers are the same, e.g. 1232 is ok, 1233 ...
- 689
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Collapse the antistring
In this challenge you will be given an alphabetic string as input. We will define the "anti-string" of a given input to be the string with the case of all the letters inverted. For example
...
- 90.2k
19
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25
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Column-wise summation of overlapping slices
Task
Given a list of integers L and another integer s, the goal is to compute the column-wise sums of all s-length (potentially overlapping) slices of L, while pertaining their positions relative to ...
- 41.6k
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Remove entries from array to sort it and maximize sum of elements
This challenge is from an admission test to a closed number cyber security course. Anyway it doesn't have to do with cyber security, it's just to test the students logical and coding skills.
Task
...
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Partition it into as few disjoint contiguous increasing subsequences as possible [closed]
Specification
This challenge is simple to state: your input is a non-empty array of nonnegative integers, and your task is to partition it into as few substrings as possible, such that each substring ...
8
votes
8
answers
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Extension of the Game of Sevens
Introduction
Output all the numbers in specific base that would appear in an adapted version of the game of seven.
Challenge
Your task is to output all the numbers in a given base in a given range, ...
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8
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Collection from a sequence that constitute a perfect square
Given the sequence OEIS A033581, which is the infinite sequence, the n'th term (0-indexing) is given by the closed form formula 6 × n2 .
Your task is to write code, which outputs all the subsets of ...
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