instruction_seed stringlengths 292 48.7k | found_ngrams listlengths 0 21 |
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Intro
A friend posed this question today in a slightly different way - "Can a single [Python] command determine the largest of some integers AND that they aren't equal?".
While we didn't find a way to do this within reasonable definitions of "a single command", I thought it might be a fun problem to golf.
Challenge
"R... | [] |
Input:
An integer n in the range 2 <= n <= 10
A list of positive integers
Output:
Convert the integers to their binary representation (without any leading zeroes), and join them all together.
Then determine all binary substrings that form a 'binary fence' using n amount of fence posts. The spaces (zeros) between each... | [] |
Introduction
Large meetings waste working time. Our aim is to split a large meeting into a number of smaller meetings, so the average number topics that a person discusses is minimized but every person has to be in every meeting they are interested in.
Input
Given is a function from a set of topics \$T\$ to a set of pe... | [] |
From this stackoverflow question
Given a 2D array of size \$ M \times N \$, output the values in a anti-clockwise fashion. The output must start from the outside to the inside and the initial point always is going to be \$(0,0)\$.
Example Given:
$$ \begin{bmatrix} \color{blue}1&\color{red}2&\color{red}3&\color{red}4 \\... | [
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],
[
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17,
11,
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220,
19,
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220,
20,
11
]
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Idea:
Consider a 2-bit bitmap of arbitrary side-lengths overlaid on a coordinate grid and imaged with random data (1's represent an element of the image, 0's represent the "blank" canvas background):
y x—0 2 4 6 8 10 14 18
|
0 0000000000111100000000
0000000011111110000000
2 0000111111111111000000
0000... | [] |
Consider an array A of length n. The array contains only positive integers. For example A = (1,1,2,2). Let us define f(A) as the set of sums of all the non-empty contiguous subarrays of A. In this case f(A) = {1,2,3,4,5,6}. The steps to produce f(A) are as follows:
The subarrays of A are (1), (1), (2), (2), (1,1), ... | [
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]
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This question has a similar set up to Find an array that fits a set of sums although is quite different in its goals.
Consider an array A of length n. The array contains only positive integers. For example A = (1,1,2,2). Let us define f(A) as the set of sums of all the non-empty contiguous subarrays of A. In this cas... | [] |
Input
Two lists with binary values (list_a, list_b) of equal length=>3.
Output
Two lists with binary values (smoothed_a, smoothed_b) with minimal Forward Difference while keeping the same sum before and after processing sum(list_a) + sum(list_b) == sum(smoothed_a) + sum(smoothed_b).
Forward Difference being the absolut... | [] |
Isn't it annoying when you're taking a picture, but the background detracts from the actual substance of the image? I'd say it is. I need to know how much I should crop so that I get rid of this problem! But - as usual - I am quite lazy, so I need someone to do this for me...
Task & Rules
Given a binary matrix represe... | [] |
Inspired by this StackOverflow question.
Input:
We'll take three inputs:
A delimiter-character D to split on
A character I between two of which we ignore the delimiter character (I know, that sounds vague, but I'll explain it below)
A string S
Output:
A list/array containing the substrings after the split.
Example:
I... | [] |
(thanks to @JonathanFrech for the title)
Challenge
Write a program or function that, given a collection of positive integers \$S\$ and a positive integer \$n\$, finds as many non-overlapping subcollections \$T_1, T_2, ..., T_k\$ of \$S\$ as possible, such that the sum of every \$T_m\$ is equal to \$n\$.
Example
Given \... | [
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18,
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220,
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11,
220
]
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There is a "sorting algorithm" sometimes called Stalin sort in which in order to sort a list you simply remove elements from the list until it is sorted in increasing order. For example the list
[1, 2, 4, 5, 3, 6, 6]
When "sorted" using Stalin sort becomes
[1, 2, 4, 5, 6, 6]
The three was removed because it was out ... | [
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Inspired by "You had me at hello"
Introduction
For those who don't know, hexadecimal is a base system like decimal. Contrary to decimal however, it uses 16 (hence the name) digits instead of 10.
Here are the first few numbers while counting up in hexadecimal to maybe give you a feel of things, although you should proba... | [
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19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
],
[
220,
16,
11,
220,
17,
11,
220,
18,
11,
220... |
Given an array of integers a which contains n integers, and a single integer x; remove the fewest amount of elements from a to make the sum of a equal to x. If no combinations of a can form x, return a falsy value.
As pointed out in a comment this is the maximum set with a sum of x, excuse my lesser math brain. I forg... | [] |
Problem A3 from the 2008 Putnam competition says:
Start with a finite sequence \$a_1, a_2, \dots, a_n\$ of positive integers. If possible, choose two indices \$j < k\$ such that \$a_j\$ does not divide \$a_k\$, and replace \$a_j\$ and \$a_k\$ by \$\gcd(a_j, a_k)\$ and \$\text{lcm}(a_j, a_k)\$, respectively. Prove that... | [
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11,
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18,
11,
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19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
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220,
19,
11,
220,
20,
11
],
[
64,
62,
16,
11,
264,
62,
17,
11,
1124,
678... |
Background
A number n can be described as B-rough if all of the prime factors of n strictly exceed B.
The Challenge
Given two positive integers B and k, output the first k B-rough numbers.
Examples
Let f(B, k) be a function which returns the set containing the first k B-rough numbers.
> f(1, 10)
1, 2, 3, 4, 5, 6, 7, 8,... | [
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[
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The 5-card magic trick involves a magician whose assistant gives them 4 shown cards and a hidden one, in this order, and the magician must guess the hidden one.
WARNING: Solution below! Leave now or get spoiled with it.
The solution
The trick here is that the five cards are given in a specific order!
\$c_1,...,c_5\$ a... | [] |
This is a follow up to Count arrays that make unique sets . The significant difference is the definition of uniqueness.
Consider an array A of length n. The array contains only positive integers. For example A = (1,1,2,2). Let us define f(A) as the set of sums of all the non-empty contiguous subarrays of A. In this c... | [] |
Given two integers, output the two integers, and then the range between them (excluding both).
The order of the range must be the same as the input.
Examples:
Input Output
0, 5 -> [0, 5, 1, 2, 3, 4]
-3, 8 -> [-3, 8, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7]
4, 4 -> [4, 4]
4, 5 -> [4, 5]
8, 2 ->... | [
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],
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17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
],
[
220,
16,
11,
220,
17,
11,
220,
18,
11,
220... |
Consider an array A of length n. The array contains only integers in the range 1 to s. For example take s = 6, n = 5 and A = (2, 5, 6, 3, 1). Let us define g(A) as the collection of sums of all the non-empty contiguous subarrays of A. In this case g(A) = [2,5,6,3,1,7,11,9,4,13,14,10,16,15,17]. The steps to produce g(A... | [] |
Matlab has a useful command for visualizing data: plot. It draws data points using "markers" in 2-D space, connecting them with lines; however, for this challenge, let's ignore the lines and use only markers. In fact, only one marker.
Input: one of Matlab's marker symbols: . o x + * s d v ^ < > p h
Output: correspondin... | [] |
Given a non-empty rectangular array of integers from 0 to 9, output the amount of cells that are 8 and do not have a neighbour that is 8. Neighbouring is here understood in the Moore sense, that is, including diagonals. So each cell has 8 neighbours, except for cells at the edges of the array.
For example, given the in... | [] |
Shorter version of Skyscrapers Challenge
Task
Given an array of building heights and a positive integer k, find all the permutations(without duplicates) of the heights such that exactly k buildings are visible.
Any building will hide all shorter or equal height buildings behind it.
Any format for input and output is va... | [] |
The Dirichlet convolution is a special kind of convolution that appears as a very useful tool in number theory. It operates on the set of arithmetic functions.
Challenge
Given two arithmetic functions \$f,g\$ (i.e. functions \$f,g: \mathbb N \to \mathbb R\$) compute the Dirichlet convolution \$(f * g): \mathbb N \to \m... | [
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19,
11,
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],
[
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17,
11,
220,
18,
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220,
19,
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20,
11
]
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As with most APL symbols, ⍉ has different meanings when called with one argument (transpose) versus two arguments (dyadic transpose / reorder dimensions). This challenge concerns the latter, which acts similarly to numpy.moveaxis in Python or permute in MATLAB, but is more powerful.
order ⍉ A when order has distinct en... | [] |
Given integer n, calculate a set of n random unique integers in range 1..n^2 (inclusive) such that the sum of the set is equal to n^2
Random, in this case, means uniformly random between valid outputs. Each valid output for a given n must have a uniform chance of being generated.
For example, n=3 should have a 1/3 chan... | [
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16,
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18,
11,
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20,
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This is a restricted-source, kolmogorov-complexity, code-golf challenge to produce a fixed output with no input.
The output format, however, is flexible - it may be printed to standard out, printed to standard error, returned as a list of characters, returned as a list of bytes, or returned as a list of integers. If yo... | [
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Here are the annual returns for a hypothetical S&P 500 stock index fund for each calendar year from 1928 to 2017, expressed as a multiplier. So in 1928 you might say "the index went up by 37.88%" which I've represented here by 1.3788.
1.3788, 0.8809, 0.7152, 0.5293, 0.8485, 1.4659, 0.9406, 1.4137, 1.2792, 0.6141, 1.25... | [
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220,
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],
[
220,
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11,
220,
17,
11,
220,
18,
11,
220... |
For nandgame fans: Please try out DPD to decimal in logic gates too!
Background
Densely packed decimal (DPD) is a way to efficiently store decimal digits in binary. It stores three decimal digits (000 to 999) in 10 bits, which is much more efficient than naive BCD (which stores one digit in 4 bits).
Notations
The lo... | [] |
The task
Given the set
$$S = \left[{1,2,3,4,5,6,7,8}\right]$$
and an integer
$$0 \leq N < 2^{|S|}$$
find the Nth subset.
Input/Output
N is given as an unsigned integer on stdin. You must print the Nth subset in a format suitable for your language (this may include [1,2,3],{1,2,3},[1, 2, 3],1 2 3,1,2,3 etc. for as long... | [] |
Peg solitaire is a popular game usually played alone. The game consists of some number of pegs and a board which is divided into a grid - usually the board is not rectangular but for this challenge we will assume so.
Each valid move allows one to remove a single peg and the goal is to play in a way, such that there is ... | [] |
Inspired by recent popularity of nandgame on TNB, and my own previous challenge.
Background
Densely packed decimal (DPD) is a way to efficiently store decimal digits in binary. It stores three decimal digits (000 to 999) in 10 bits, which is much more efficient than naive BCD (which stores one digit in 4 bits).
Convers... | [] |
Summary
A teacher was told to prepare word problems for the students. She is given a list of equations and told to write them as the corresponding word problem. However, she is very lazy, so she doesn't put much creativity into it. Instead, she simply writes it literally. For example, when she reads 1+1, she writes one... | [] |
Goal
The goal of this challenge is to produce a function of n which computes the number of ways to partition the n X 1 grid into triangles where all of the vertices of the triangles are on grid points.
Example
For example, there are 14 ways to partition the 2 x 1 grid, so f(2) = 14 via the following partitions
where t... | [] |
Challenge
Mark is a student who receives his N marks in a concatenated way in a one single line.
The challenge is to separate his marks, knowing that each mark can only be 0 or 1 or 2 or 3 or 4 or 5 or 6 or 7 or 8 or 9 or 10.
Input
N natural number and one line.
Output
A set of natural numbers.
Example
N, One line-----... | [] |
Given an input n, write a program or function that outputs/returns the sum of the digital sums of n for all the bases 1 to n.
$$n + \sum_{b=2}^n \sum_{i=0}^\infty \left\lfloor \frac{n}{b^i} \right\rfloor \bmod b$$
Example:
n = 5
Create the range [1...n]: [1,2,3,4,5]
For each element x, get an array of the base-x digi... | [] |
Given some finite list, return a list of all its prefixes, including an empty list, in ascending order of their length.
(Basically implementing the Haskell function inits.)
Details
The input list contains numbers (or another type if more convenient).
The output must be a list of lists.
The submission can, but does not... | [] |
Problem:
Find the number of leading zeroes in a 64-bit signed integer
Rules:
The input cannot be treated as string; it can be anything where math and bitwise operations drive the algorithm
The output should be validated against the 64-bit signed integer representation of the number, regardless of language
Default code... | [] |
For a computer vision app I want to do a mapping of an image, in such a way that every pixel fit hilbert curve, instead of conventional layout. So task could be as follows:
Task description
Given square 2D image A with side 2^^N, (N>0), with common Z-order, or row-major representation of pixels in RAM. I need to run ... | [] |
Background
OEIS sequence A272573 describes a spiral on a hexagonal grid as follows:
Start a spiral of numbers on a hexagonal tiling, with the initial hexagon as a(1) = 1. a(n) is the smallest positive integer not equal to or previously adjacent to its neighbors.
The sequence begins
1, 2, 3, 4, 5, 6, 7, 4, 6, 8, 5, 9,... | [
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[
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The Korean language has two sets of numerals, a native Korean numerals and Sino-Korean numerals.
The native Korean numerals are mostly used for numbers under 100, such as age and time.
The Sino-Korean numeral system, which is based on the Chinese numeral system as its name says, is used in most of the time.
It uses 4-d... | [] |
Given a list of floating point numbers, standardize it.
Details
A list \$x_1,x_2,\ldots,x_n\$ is standardized if the mean of all values is 0, and the standard deviation is 1. One way to compute this is by first computing the mean \$\mu\$ and the standard deviation \$\sigma\$ as
$$ \mu = \frac1n\sum_{i=1}^n x_i \qquad ... | [] |
Imagine we have some polyomino and would like to uniquely identify them, however the polyominos can be rotated, so blindly hashing them won't give us the same fingerprint for a piece and a rotation thereof (in general).
For example if we have the L-tetromino
x
x
xx
we would like it to have the same fingerprint as any ... | [] |
If 1 is not counted as a factor, then
40 has two neighboring factors (4 and 5)
1092 has two neighboring factors (13 and 14)
350 does not have two neighboring factors
(out of its factors 2, 5, 7, 10, 14, 25, 35, 50, 70, and 175,
no two are consecutive)
The proportion of positive integers that have this property
is the... | [] |
Tournament over!
The tournament is now over! The final simulation was run during the night, a total of \$3*10^8\$ games. The winner is Christian Sievers with his bot OptFor2X. Christian Sievers also managed to secure the second place with Rebel. Congratulations! Below you can see the official high score list for the to... | [] |
Input
A binary matrix \$M\$ representing the walls of a dungeon.
The position \$(x,y)\$ of the player within the dungeon.
The direction \$d\$ that the player is currently facing (0 = North, 1 = East, 2 = South, 3 = West)
Output
A pseudo-3D representation of the walls that are in the field of view of the player, as an... | [] |
This is a "counterpart" of another puzzle, Eight coins for the fair king on Puzzling.SE.
You can read the above puzzle for the background. The details about this puzzle are as follows.
A set of 8 kinds of coins of different values are created, the king wants you to find out the maximum N such that any number of price f... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
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19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
]
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Let's define the a function on natural numbers \$n\$, written as base 10 digits \$d_k\; d_{k-1}\; \dotsc\; d_1\; d_0\$, as follows:
As long as there are equal adjacent digits \$d_i\;d_{i-1}\$, replace them by their sum \$d_i+d_{i-1}\$ from left to right. If there were any such digits, repeat the same procedure.
In othe... | [] |
Your task is to determine the length of the longest descent down a "mountain" represented as a grid of integer heights. A "descent" is any path from a starting cell to orthogonally adjacent cells with strictly decreasing heights (i.e. not diagonal and not to the same height). For instance, you can move from 5-4-3-1 but... | [] |
TL;DR for those not interested: Look at the test cases at the bottom. Have a program/function that outputs the 2D list displayed for the given input.
Introduction:
On November 15th, 2018 puzzle designer Raphaël Mouflin revealed his Triangularity puzzle. Here is a picture of that puzzle:
As you can see, the shape is a ... | [] |
Given a list of strictly positive integers, go through each distinct number and replace all occurrences of it with successive indices (zero or one based) of a new series.
Examples
[] → []/[]
[42] → [0]/[1]
[7,7,7] → [0,1,2]/[1,2,3]
[10,20,30] → [0,0,0]/[1,1,1]
[5,12,10,12,12,10] → [0,0,0,1,2,1]/[1,1,1,2,3,2]
[2,7,1,8,2... | [] |
Input:
An integer n
Two equal-sized square matrices (with their width/height being a multiple of n)
Output:
One of two distinct values of your own choice, one being for truthy results and one for falsey results (so yes, 1/0 instead of true/false are valid outputs for languages like Java, even though they're not consi... | [] |
Given a binary 3D array, for each layer, cyclically rotate up each of its columns as many steps as indicated by the binary encoding of the columns of the layer above it, and then cyclically rotate left each of its rows as many steps as indicated by the binary encoding of the rows of the layer below it.
There will alway... | [] |
This challenge is based on the following puzzle: You are given an n by n grid with n cells marked. Your job is to the partition the grid into n parts where each part consists of exactly n cells, each containing exactly one marked cell.
Example
Here is a puzzle on the left and its (unique) solution on the right:
Chall... | [] |
Introduction
Inspired by the very recent video The Trapped Knight - Numberphile, I came up with a challenge.
The trapped knight sequence is a finite integer sequence of length 2016, starting from 1, and has the following construction rules:
Write a number spiral in the following manner:
17 16 15 14 13 ...
18 5 4 3... | [
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16,
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A flow network is a directed graph G = (V, E) with a source vertex s ϵ V and a sink vertex t ϵ V, and where every edge (u, v) ϵ E on the graph (connecting nodes u ϵ V and v ϵ V) has 2 quantities associated with it:
c(u, v) >= 0, the capacity of the edge
a(u, v) >= 0, the cost of sending one unit through the edge
We d... | [] |
Your task, if you wish to accept it, is to write a program that outputs its own source code in the binary UTF-8 representation.
Rules
The source must be at least 1 byte long.
Your program must not take input (or have an unused, empty input).
The output may be in any convient format.
Optional trailing newline is allow... | [] |
You've probably heard of Fibonacci numbers. Ya know, that integer sequence that starts with 1, 1, and then each new number is the sum of the last two?
1 1 2 3 5 8 13...
And so on. Challenges about Fibonacci numbers are pretty popular 'round here. But who says that the Fibonacci numbers have to start with 1, 1? Why cou... | [] |
Single moves
The board is an infinite 2 dimensional square grid, like a limitless chess board. A piece with value N (an N-mover) can move to any square that is a distance of exactly the square root of N from its current square (Euclidean distance measured centre to centre).
For example:
A 1-mover can move to any squar... | [] |
Here's the challenge. Write some code to output all the integers in a range. Sounds easy, but here's the tricky part. It will start with the lowest number, then the highest. Then the lowest number which isn't yet in the array. Then the highest which isn't yet in it.
Example:
Lets take 1 to 5 as our start
The numbers ... | [
[
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19,
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20
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I recently decided to download some dictation software, in order to help with my writing. However, it doesn't work very well when I'm coding, since I have to change from saying words to symbols and back again. It's even worse when I'm coding in an esoteric language which is all symbols.
In order to make my use of the d... | [] |
Sorting makes no sense for a 2-dimensional array... or does it?
Your task is to take an input grid and apply a bubble-sort-like algorithm to it until all values in the grid are non-decreasing from left to right and top to bottom along every row and column.
The algorithm works as follows:
Each pass goes row by row, top... | [] |
Challenge
Input:
An integer \$b\$ between 2 and 62 (inclusive).
Output:
Count from \$1\$ to the equivalent of \$5000_{10}\$ in base \$b\$, using any reasonable representation for the digits.
However:
If the number is divisible by \$\lfloor b÷2+1\rfloor\$ (rounded down, e.g base 7 would be 7/2=3.5, 3.5+1=4.5, rounded t... | [
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425,
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356,
11,
422,
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468,
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434,
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479,
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472
],
[
11,
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11,
468,
11,
434,
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479,
11,
472,
11,
358,
11
],
[
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220,
18,
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220,
19,
... |
Given a decimal number k, find the smallest integer n such that the square root of n is within k of an integer. However, the distance should be nonzero - n cannot be a perfect square.
Given k, a decimal number or a fraction (whichever is easier for you), such that 0 < k < 1, output the smallest positive integer n such ... | [] |
A jumping number is defined as a positive number n which all pairs of consecutive decimal digits differ by 1. Also, all single digit numbers are considered jumping numbers. eg. 3, 45676, 212 are jumping numbers but 414 and 13 are not. The difference between 9 and 0 is not considered as 1
The challenge
Create a program ... | [
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]
] |
So I ran into this progressive/idle game cleverly called Idle Dice. Has a variety of random effects applied to a pretty typical progression formula game. Warning, time sink! Play at your own risk.
However after you have 5 dice (summed the usual way) along with some bonuses for various matches (pair, two pair, three of ... | [] |
Given a truth table and two images, use the truth table as a bitwise operation to the two images.
For example with the truth table:
1 0
1 0 0
0 1 0
(Note that the top is the first image and the left is the second)
and the two images (0, 2, 4) (a 1x1 image, with the numbers being RGB values) and (30, 20, 10):
You wou... | [] |
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 an increasing value, etc.
For instance, the tier 3 metasequence would start as:
1 2 4 8 15 26 42 64 93 130 176
because:... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
],
[
220,
16,
11,
220,
17,
11,
220,
18,
11,
220... |
In association football (also known as soccer), a penalty shoot-out is the second tie-breaker measure that may be used in a match which can't end in a tie, after extra time (i.e. association football overtime).
In a penalty shoot-out, the main referee tosses a coin to determine at which goal the shoot-out happens, and ... | [] |
Challenge
This challenge will have you write a program that takes in two integers n and m and outputs the number non-intersecting loops on the n by m torus made by starting at (0,0) and only taking steps up and to the right. You can think of torus as the grid with wraparound both at the top and the bottom and on the si... | [] |
Challenge:
Input: A list of distinct positive integers within the range \$[1, \text{list-size}]\$.
Output: An integer: the amount of times the list is riffle-shuffled. For a list, this means the list is split in two halves, and these halves are interleaved (i.e. riffle-shuffling the list [1,2,3,4,5,6,7,8,9,10] once wou... | [] |
Rectangles have this nice property - an \$n \times m\$ rectangle consists of exactly \$n \times m\$ characters!
A.. more interesting property is that the rectangles can be aligned nicely in a multiplication table - for example, a \$3 \times 3\$ table:
# ## ###
# ## ###
# ## ###
# ## ###
# ## ###
# ## ###
Your challe... | [] |
In Pascal's triangle each number is the sum of the two numbers directly above it, treating empty spots as zero:
By rotating the triangle, we can cut out square matrices of varying sizes and rotations which I will call Pascal's matrices. Note that those matrices always need to contain the top \$1\$. Here are some examp... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
]
] |
You will be given an ASCII text. This text may have zero, one or many appearances of a split a character (let's assume it will be the space character )
You will also be given an offset integer value (zero based) anywhere between zero and the length of the text.
You should calculate the relative offset inside the one sp... | [] |
Hehe, see what I did with the title? Anyways...
Your job is to create a sudoku solver that accepts input in Morse code and creates output in Morse code. Here's the Morse code numbers for reference:
0: -----
1: .----
2: ..---
3: ...--
4: ....-
5: .....
6: -....
7: --...
8: ---..
9: ----.
Rules:
The code must... | [] |
Challenge:
Input: A positive integer \$n\$
Output:
Create a list in the range \$[1,n]\$, and join it together to a string (i.e. \$n=13\$ would be the string 12345678910111213).
Now we output a triangle using the prefixes or suffixes of this string, in one of the following four orientations based on the input integer:
... | [] |
Given a list of jobs, which must be done in order, with each taking a slot to do, how long will it take to perform them all if after doing a job the same job cannot be done for the next two slots (cooling off slots)? However, a different job can be assigned in this cooling off slots.
For example,
[9,10,9,8] => output: ... | [] |
Challenge:
Your program will take two integers n and k as input, and output the smallest integer greater than (but not equal to) n that contains at least k occurrences of the digit 5.
You can assume 1 ≤ k ≤ 15 and 1 ≤ n < 10**15.
This is a restricted-time challenge. Your program must run on TIO for all of the test cas... | [] |
Inspired by this SO question.
Challenge:
Input:
A string \$s\$
A character \$c\$
Output:
Create a diamond-square ASCII art of the string in all four directions, with the first character of the string in the center and going outwards. Which is inside a square ASCII-art carpet, with the character as filler. This may so... | [] |
The sorting algorithm goes like this:
While the list is not sorted, snap half of all items (remove them from the list). Continue until the list is sorted or only one item remains (which is sorted by default). This sorting algorithm may give different results based on implementation.
The item removal procedure is up to ... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
]
] |
Introduction:
I saw there was only one other badminton related challenge right now. Since I play badminton myself (for the past 13 years now), I figured I'd add some badminton-related challenges. Here the first one:
Challenge:
Input: Two integers
Output: One of three distinct and unique outputs of your own choice. One ... | [] |
Introduction (may be ignored)
Putting all positive numbers in its regular order (1, 2, 3, ...) is a bit boring, isn't it? So here is a series of challenges around permutations (reshuffelings) of all positive numbers. This is the third challenge in this series (links to the first and second challenges).
In this challen... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
],
[
220,
16,
11,
220,
17,
11,
220,
18,
11,
220... |
Take a positive integer \$k\$ as input. Start with \$n := 1\$ and repeatedly increase \$n\$ by the largest integer power of ten \$i\$ such that \$i \le n\$ and \$i + n \le k\$.
Repeat until \$n = k\$ and return a list of all intermediate values of \$n\$, including both the initial \$1\$ and the final \$k\$.
During this... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
]
] |
I recently had a problem to solve at work where I had two lists: a master list, and a smaller list that contains a subset of the items in the master list potentially in a different order. I needed to reorder the master list in such a way that the items in the subset would appear in the same order without changing the o... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
]
] |
Given a date as input in any convenient format, output a calendar with that date as the exact center of a five-week window. The header of the calendar must include the two-letter abbreviations for the days of the week (i.e., Su Mo Tu We Th Fr Sa). Three-letter or other abbreviations of the days are not allowed.
For exa... | [] |
The Arecibo message is a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star cluster M13 in the hope that extraterrestrial intelligence might receive and decipher it... The message consisted of 1,679 binary digits, approximately 210 bytes...
The number 1,679 was ch... | [] |
Problem
You're stuck in a cabin in the middle of the woods, with only an old scrabble set to entertain yourselves. Upon inspection you see that the scrabble letters are so worn, that only the points for each letter are visible.
Nonetheless you decide to play a game. You pull seven letters from the bag and place them o... | [] |
The Idea
We've done matrix spirals before, and full rotations, and even diagonal
rotations,
but not, as far as I can find, snake rotations!
What is a snake rotation?
Imagine the rows of a matrix snaking back and forth, with dividers between
them like the dividers of long queue:
+--------------+
1 2 3 4 5|... | [] |
Introduction:
A 3x3x3 Rubik's Cube has \$43,252,003,274,489,856,000\$ possible permutations, which is approximately 43 quintillion. You may have heard about this number before, but how is it actually calculated?
A 3x3x3 Rubik's Cube has six sides, each with nine stickers. Looking at the (external) pieces instead of sti... | [] |
Introduction (may be ignored)
Putting all positive integers in its regular order (1, 2, 3, ...) is a bit boring, isn't it? So here is a series of challenges around permutations (reshuffelings) of all positive integers. This is the sixth challenge in this series (links to the first, second, third, fourth and fifth chall... | [] |
The challenge is simply; output the following six 2D integer arrays:
[[ 1, 11, 21, 31, 41, 51],
[ 3, 13, 23, 33, 43, 53],
[ 5, 15, 25, 35, 45, 55],
[ 7, 17, 27, 37, 47, 57],
[ 9, 19, 29, 39, 49, 59]]
[[ 2, 11, 22, 31, 42, 51],
[ 3, 14, 23, 34, 43, 54],
[ 6, 15, 26, 35, 46, 55],
[ 7, 18, 27, 38, 47, 58],
[10, 1... | [] |
What is a Prime Square?
A Prime Square is a square where all four edges are different prime numbers.
But which ones?
And how do we construct them?
Here is an example of a 4x4 Prime Square
1009
0 0
3 0
1021
First we start from the upper left corner. We are working clockwise.
We pick the smallest prime number having 4... | [] |
Some divisors of positive integers really hate each other and they don't like to share one or more common digits.
Those integers are called Hostile Divisor Numbers (HDN)
Examples
Number 9566 has 4 divisors: 1, 2, 4783 and 9566
(as you can see, no two of them share the same digit).
Thus, 9566 is a Hostile Divisor... | [] |
The dihedral group \$D_4\$ is the symmetry group of the square, that is the moves that transform a square to itself via rotations and reflections. It consists of 8 elements: rotations by 0, 90, 180, and 270 degrees, and reflections across the horizontal, vertical, and two diagonal axes.
The images are all from this lo... | [] |
I'm a big fan of number theory. A big thing in number theory is modular arithmetic; the definition being \$a\equiv b\mod m\$ if and only if \$m\mid a-b\$. A fun thing to do is raising to powers: especially when the modulus is a prime number. In particular, it has been proven that if \$a\$ and \$m\$ are relatively prime... | [] |
Introduction
In number theory, we say a number is \$k\$-smooth when its prime factors are all at most \$k\$. For example, 2940 is 7-smooth because \$2940=2^2\cdot3\cdot5\cdot7^2\$.
Here, we define a \$k\$-smooth pair as two consecutive integers which both are \$k\$-smooth. An example of 7-smooth pair will be \$(4374,43... | [] |
Background
Ada is a programming language that is not exactly known for its terseness.
However, its array literal syntax can in theory allow for fairly terse array
specifications. Here is a simple EBNF description of the array literal
syntax (passable to bottlecaps.de:
array ::= positional_array | named_array
positional... | [] |
According to http://en.cppreference.com/w/cpp/language/integer_literal, integer literals consist of a decimal/hex/octal/binary literal and a optional integer suffix, that is obviously completely unnecessary, wastes precious bytes and is not used in this challenge.
A decimal literal is a non-zero decimal digit (1, 2, 3,... | [
[
16,
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20
],
[
11,
220,
17,
11,
220,
18,
11,
220,
19,
11,
220,
20,
11
],
[
220,
16,
11,
220,
17,
11,
220,
18,
11,
220... |
Thanks, Uncle (the story)
My slightly mad uncle recently left for the space colonies, and passed his pallet goods business to me. The rectangular warehouse is full of pallets of goods except for the one square by the door, and I've just received the first list of pallets ordered by customers to be sent out today.
Fortu... | [] |
It was a dark and stormy night. Detective Havel and Detective Hakimi arrived at the scene of the crime.
Other than the detectives, there were 10 people present. They asked the first person, "out of the 9 other people here, how many had you already met before tonight?" The person answered "5". They asked the same questi... | [] |
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