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# Questions tagged [subsequence]

Challenges pertaining to a sequence within a larger sequence

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### Maximal linear sublists

In this challenge you will write code to take a list of positive integers and output all maximal linear sublists. A sublist is is a list which can be created by deleting values from the the input ...
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### Otteretto Classic game scoring method

Brief description of the game In the game Otteretto Classic (which you can test directly in your browser; try it!) the player has to form palindromic sequences using adjacent cells on a square grid. ...
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### Straight pen strokes for Prime Numbers

Challenge You are supposed to output the series I recently designed which goes as follows which are pen stroke counts of ascending prime numbers: ...
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### Bumping Series Implementation

I have a follow-up question here from my previous question on Math SE. I am lazy enough to explain the content again, so I have used a paraphraser to explain it below: I was considering arbitrary ...
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### Find the largest sum of any contiguous subarray of the array [duplicate]

Let's say you are given an integer array. Create a function to determine the largest sum of any array's adjacent subarrays. For instance, the contiguous subarray with the largest sum is ...
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### Find the first run of numbers summing to n

Given as input a positive nonzero integer n >= 10 and a sequence of digits 0-9 (which may be taken as a string or a list), ...
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### Count the shared substrings with 2 programs

Write 2 programs in the same language which count the number of shared subsequences of consecutive elements from 2 given sequences. For example, given ...
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### Longest alternating subsequence

inspired by Longest Increasing Substring Task Given a list of non-negative integers, output the length of its longest alternating subsequence. An alternating sequence is a sequence of numbers which ...
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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 ...
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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 ...
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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 ...
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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 ... • 68.7k 21 votes 13 answers 2k views ### 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 ... • 98.8k 16 votes 17 answers 917 views ### 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 ... • 49.9k 24 votes 27 answers 2k views ### 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 ... • 3,847 24 votes 29 answers 3k views ### 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 ... • 76.7k 26 votes 34 answers 2k views ### 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 ... • 22.7k 11 votes 22 answers 2k views ### Park, Lake, Santa Fe [closed] Given a long multi-sentence string, the goal is the count the occurrences of the following words: park, lake, ... • 569 23 votes 23 answers 3k views ### 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 ... • 34.9k 34 votes 26 answers 4k views ### 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 ... • 49.9k 20 votes 19 answers 2k views ### 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$2^w$... • 1,478 18 votes 19 answers 3k views ### 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 ... • 49.9k 14 votes 2 answers 518 views ### 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 <... • 49.9k 12 votes 15 answers 795 views ### 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 $of a length of at least$ ...
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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 ...
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### Count strictly overlapping substrings

Given two strings a and b, count how many times b occurs as a substring in ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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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### 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 ...
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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 ...
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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 ...
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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 ...
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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: <...
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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: ...
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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 ...
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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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### 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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