Questions tagged [grid]
For challenges involving a grid.
244
questions
24
votes
20answers
2k views
How many balloons do I need in each corner?
You have a square board with a bunch of items laid out on it in one of a \$3 \times 3\$ grid of cells and you want to lift it up using balloons, but you can only attach balloons to the corners of the ...
19
votes
13answers
963 views
Walk home one step at a time
You're at integer coordinates \$(x,y)\$ facing one of North, South, East, or West. Your goal is to walk home to \$(0,0)\$. At each step, you may do one of:
Walk one step in the current facing ...
8
votes
0answers
283 views
Morpion solitaire
Morpion solitaire
This is a game that I remember having learnt from my grandparents in my childhood. Initially I didn't know the name. G B has found it to be Join Five (or less ambiguously - Morpion ...
14
votes
3answers
264 views
Is this board Latin-style?
Inspired by Flow Fit: Sudoku, a brand-new mobile puzzle game (as of Nov 2019).
Background
A Latin square is a square grid of side length \$ n \$ filled with \$ n \$ different symbols, where each row ...
3
votes
1answer
365 views
16
votes
1answer
373 views
Counting symmetric grid chains
Notation and definitions
Let \$[n] = \{1, 2, ..., n\}\$ denote the set of the first \$n\$ positive integers.
A polygonal chain is a collection of connected line segments.
The corner set of a ...
24
votes
4answers
805 views
Can Jimmy escape the ghosts?
It is Halloween and Jimmy (/o\) has gone into a mysterious neighborhood for trick-or-treating (ask himself why). Now some evil ghosts are chasing him. Can Jimmy ...
16
votes
5answers
401 views
Is it a Hamiltonian cycle on a grid?
A Hamiltonian path in a graph is a path that visits each vertex exactly once; a Hamiltonian cycle is a Hamiltonian path that is a cycle – the path forms a simple closed loop. In this challenge the ...
17
votes
2answers
622 views
Number of distinct tilings of an n X n square with free n-polyominoes
The newest "nice" OEIS sequence, A328020, was just published a few minutes ago.
Number of distinct tilings of an n X n square with free n-polyominoes.
This sequence counts tilings up to symmetries ...
5
votes
2answers
273 views
Identical grids
You’re given two \$r×c\$ grids. Each cell contains either 0 or 1. What are the minimum number of swaps (between horizontally and vertically adjacent cell elements, no wrapping i.e no swapping between ...
19
votes
1answer
319 views
Complete the grid-filling meander
A grid-filling meander is a closed path that visits every cell of a square \$N \times N\$ grid at least once, never crossing any edge between adjacent cells more than once and never crossing itself. ...
21
votes
8answers
958 views
Alice's First Code Review
Alice is an intern in a company that uses Brainfuck as a primary language for both client-side and server-side development. Alice just has written her first code and she's a bit nervous as she's ...
6
votes
2answers
420 views
Can the cursor reach the bottom?
In a matrix of characters, a cursor is a movable position between two adjacent characters, before the first character or after the last character in a line, like that "I"-shaped indicator which moves ...
9
votes
2answers
199 views
Reroute the Path
Given a grid of directions and a start and end position, determine the minimum number of substitutions in the direction grid that needs to be made to complete the path between the two points. The grid ...
9
votes
1answer
278 views
Partition and Restructure
Given two contiguous shapes of the same area, determine the optimal way to divide the first shape into a minimum number of contiguous segments such that they can be rearranged to form the second shape....
10
votes
10answers
689 views
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 ...
5
votes
1answer
160 views
Words Everywhere
Given a list of words, output a square grid of characters, so that all the words can be read from the grid, by moving horizontally, vertically, or diagonally between characters, without reusing ...
12
votes
5answers
349 views
Terrain Reachability
Turn-based tactics games like Advance Wars, Wargroove, and Fire Emblem are made up of a square grid of varying terrain with units of differing movement classes requiring different costs for each ...
20
votes
8answers
849 views
Cycles on the torus
Challenge
This challenge will have you write a program that takes in two integers n and m and outputs the number non-...
17
votes
10answers
572 views
2-Dimensional Bubble Sort
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 ...
48
votes
8answers
3k views
N-movers: How much of the infinite board can I reach?
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 ...
30
votes
3answers
1k views
A Turtle Finds a Portal
The turtle wants to move along the grid to get to his food. He wants to know how many moves it will take for him to get there.
As well since he is slow he has teleporters set up around his domain ...
11
votes
3answers
270 views
Ambiguous Locations on a Grid
You have a little robot with four distance sensors. It knows the layout of a room, but it has no sense of orientation other than being able to lock onto the grid orientation. You want to be able to ...
17
votes
1answer
317 views
Partition a square grid into parts of equal area
This challenge is based on the following puzzle: You are given an n by n grid with n cells ...
8
votes
1answer
288 views
Count the Closed Polygons
Input:
An NxM grid or multi-line string (or other reasonable input-format), containing only printable ASCII (unicode range ...
8
votes
7answers
828 views
Length of the Longest Descent
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 ...
3
votes
17answers
375 views
Print coordinates of an NxN grid [duplicate]
Question: Print out all the coordinates of a NxN grid. Preferably in C, however other languages also accepted
Input: N (integer)
Output: for N=3, a 3x3 grid:
...
18
votes
9answers
2k views
Partitioning the grid into triangles
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 ...
10
votes
1answer
292 views
Tatamibari solver
Background
Tatamibari is a logic puzzle designed by Nikoli.
A Tatamibari puzzle is played on a rectangular grid with three different kinds of symbols in it: +, <...
4
votes
2answers
245 views
Nightmare Puzzlang translator
Background
Puzzlang is a derivative of Brainfuck, where the symbol X executes a BF command based on three characters on top of it, and anything else does nothing.
...
25
votes
25answers
5k views
Output a Sudoku board
Today's challenge is simple: Without taking any input, output any valid sudoku board.
In case you are unfamiliar with sudoku, Wikipedia describes what a valid board should look like:
The objective ...
12
votes
6answers
703 views
Get me out of here
Challenge
Given a grid size, obstacles' positions, player position and target position your task is to find a path for the player to get to the target and avoid the obstacles at the same time (if ...
4
votes
0answers
370 views
Textbattles KoTH [closed]
Textbattles
Textbattles is is strategy game about, well, text.
It consists of a 10x10 grid, where each player has a position on the grid. When it is a player's turn, they can decide whether to move a ...
17
votes
3answers
481 views
Dead Frog Walking
Introduction
Jonny wants to play Frogger. However, he's not very good. In fact, he will only try to move forward, and only after the platforms have moved.
Find out if Jonny's frog manages to reach ...
35
votes
6answers
3k views
Where is that snake going?
Write a function (using as few bytes as possible) that takes a bi-dimensional array of any number of columns and rows in which:
0 represents empty block,
...
16
votes
10answers
2k views
Assign Airliner Seats
Inspired by last week's APL lesson.
Given an uppercase 2D seat map and a 1D list of customers, return the seat map and the customer list but modified as follows (to indicate occupied seats and seated ...
11
votes
3answers
503 views
Word Search on a Torus [duplicate]
The Challenge
Given a list of words and a grid of letters, your job is to determine which of the given words can be found on the grid in all 8 directions (forward, backward, up, down, and the 4 ...
14
votes
10answers
934 views
Area enclosed by perimeter loop
Find the area of a region of unit cells given its perimeter loop as a sequence of 90-degree turns.
For example, take the three-cell region
XX
X
whose perimeter ...
9
votes
5answers
372 views
Four Spiraling Axes
Take the numbers 0, 1, 2, 3, 4, ... and arrange them in a clockwise spiral, starting downward, writing each digit in its own separate square.
Then, given one of ...
21
votes
1answer
462 views
Roguelike pathfinding
Roguelike pathfinding
Your task will be, given a two-dimensional array of the elements described below, which represents a dungeon, to output or return a single number representing the amount of gold ...
24
votes
3answers
735 views
Ice Golf Challenge
The goal of this challenge is to write a program or function that returns the least amount of strikes needed to complete a given course.
Input
The layout of the course can be passed in any suitable ...
10
votes
3answers
762 views
RoboZZle interpreter
Your task is to write a RoboZZle interpreter. If you're not familiar with the game, please watch the video at robozzle.com or read my description below.
A robot lives on a rectangular grid of squares ...
21
votes
10answers
1k views
Finding Lonely Primes
Lonely primes (as I call them) are primes, where given a number grid with width w ≥ 3, are primes which do not have any other primes adjacent to them orthogonally ...
10
votes
2answers
569 views
26
votes
1answer
458 views
Jolly gerrymandering
Background
The United States has a unique love of gerrymandering––the deliberate manipulation of an electoral district to predict certain voting results. Just recently there was a gerrymandering case ...
14
votes
7answers
633 views
Is my kids' alphabet mat properly grouped by colors?
My kids have an alphabet mat to play with, something like this:
After months with the tiles of the mat randomly placed, I got tired and placed all the tiles of the mat grouped by sections according ...
24
votes
3answers
375 views
Implement simplified kerning
Introduction
Kerning means adjusting the spacing between the letters of a text.
As an example, consider the word Top written with the following three glyphs:
<...
27
votes
9answers
2k views
ASCII rhombic grid
Write the shortest code measured by byte count to generate an ASCII grid composed of rhombi, given the following parameters:
m - number of complete rhombi in one row
n - number of rows
s - side of ...
6
votes
2answers
219 views
Balanced and Centre-Free Sets of Points
Taking in Input
Define a function f as follows:
IF x < 0:
f(x) = -√|x|
ELSE:
f(x) = √x
In your programs/functions,...
2
votes
0answers
123 views
Bucket Brigade! [closed]
Inspired by this, this and this.
So, now that the evil farmer has set your field on fire, you naturally want to put it out. You have a bunch of friends who all have buckets, and you want a program ...
