Partition a square grid into parts of equal area
$begingroup$
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.
Example
Here is a puzzle on the left and its (unique) solution on the right:
Challenge
You will be given a set of n zero-indexed coordinates in any reasonable format.
[(0,0), (0,3), (1,0), (1,1), (2,2)]
And your job is to write a program that returns any valid parition (again, in any reasonable format).
[
[(0,0), (0,1), (0,2), (1,2), (1,3)],
[(0,3), (0,4), (1,4), (2,4), (3,4)],
[(1,0), (2,0), (3,0), (4,0), (4,1)],
[(1,1), (2,1), (3,1), (3,2), (4,2)],
[(2,2), (2,3), (3,3), (4,3), (4,4)]
]
If the puzzle has no solution, the program should indicate that by throwing an error or returning an empty solution.
Input/Output Examples
[(0,0)] => [[(0,0)]]
[(0,0), (1,1)] => [
[(0,0), (1,0)],
[(0,1), (1,1)]
]
[(0,0), (0,1), (1,0)] => (no solution)
[(0,0), (0,1), (0,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (1,1), (2,1)],
[(0,2), (1,2), (2,2)],
]
[(0,0), (0,2), (1,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (0,2), (1,1)],
[(1,2), (2,1), (2,2)],
]
Scoring
This is code-golf, so shortest code wins.
code-golf combinatorics grid set-partitions
asked 5 hours ago
Peter KageyPeter Kagey
773517
$endgroup$
add a comment |
$begingroup$
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.
Example
Here is a puzzle on the left and its (unique) solution on the right:
Challenge
You will be given a set of n zero-indexed coordinates in any reasonable format.
[(0,0), (0,3), (1,0), (1,1), (2,2)]
And your job is to write a program that returns any valid parition (again, in any reasonable format).
[
[(0,0), (0,1), (0,2), (1,2), (1,3)],
[(0,3), (0,4), (1,4), (2,4), (3,4)],
[(1,0), (2,0), (3,0), (4,0), (4,1)],
[(1,1), (2,1), (3,1), (3,2), (4,2)],
[(2,2), (2,3), (3,3), (4,3), (4,4)]
]
If the puzzle has no solution, the program should indicate that by throwing an error or returning an empty solution.
Input/Output Examples
[(0,0)] => [[(0,0)]]
[(0,0), (1,1)] => [
[(0,0), (1,0)],
[(0,1), (1,1)]
]
[(0,0), (0,1), (1,0)] => (no solution)
[(0,0), (0,1), (0,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (1,1), (2,1)],
[(0,2), (1,2), (2,2)],
]
[(0,0), (0,2), (1,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (0,2), (1,1)],
[(1,2), (2,1), (2,2)],
]
Scoring
This is code-golf, so shortest code wins.
code-golf combinatorics grid set-partitions
asked 5 hours ago
Peter KageyPeter Kagey
773517
$endgroup$
$begingroup$
This was inspired by this Math Stack Exchange question.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
@Arnauld, it looks like for Shikaku puzzles, "the objective is to divide the grid into rectangular and square pieces". In this case, there is no such constraint.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
Sorry for the confusion. I think there might be a Shikaku challenge somewhere in the sandbox, or maybe I was planning to make one myself at some point -- I can't remember for sure. Either way, I thought it was the same thing at first glance.
$endgroup$
– Arnauld
5 hours ago
add a comment |
$begingroup$
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.
Example
Here is a puzzle on the left and its (unique) solution on the right:
Challenge
You will be given a set of n zero-indexed coordinates in any reasonable format.
[(0,0), (0,3), (1,0), (1,1), (2,2)]
And your job is to write a program that returns any valid parition (again, in any reasonable format).
[
[(0,0), (0,1), (0,2), (1,2), (1,3)],
[(0,3), (0,4), (1,4), (2,4), (3,4)],
[(1,0), (2,0), (3,0), (4,0), (4,1)],
[(1,1), (2,1), (3,1), (3,2), (4,2)],
[(2,2), (2,3), (3,3), (4,3), (4,4)]
]
If the puzzle has no solution, the program should indicate that by throwing an error or returning an empty solution.
Input/Output Examples
[(0,0)] => [[(0,0)]]
[(0,0), (1,1)] => [
[(0,0), (1,0)],
[(0,1), (1,1)]
]
[(0,0), (0,1), (1,0)] => (no solution)
[(0,0), (0,1), (0,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (1,1), (2,1)],
[(0,2), (1,2), (2,2)],
]
[(0,0), (0,2), (1,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (0,2), (1,1)],
[(1,2), (2,1), (2,2)],
]
Scoring
This is code-golf, so shortest code wins.
code-golf combinatorics grid set-partitions
asked 5 hours ago
Peter KageyPeter Kagey
773517
$endgroup$
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.
Example
Here is a puzzle on the left and its (unique) solution on the right:
Challenge
You will be given a set of n zero-indexed coordinates in any reasonable format.
[(0,0), (0,3), (1,0), (1,1), (2,2)]
And your job is to write a program that returns any valid parition (again, in any reasonable format).
[
[(0,0), (0,1), (0,2), (1,2), (1,3)],
[(0,3), (0,4), (1,4), (2,4), (3,4)],
[(1,0), (2,0), (3,0), (4,0), (4,1)],
[(1,1), (2,1), (3,1), (3,2), (4,2)],
[(2,2), (2,3), (3,3), (4,3), (4,4)]
]
If the puzzle has no solution, the program should indicate that by throwing an error or returning an empty solution.
Input/Output Examples
[(0,0)] => [[(0,0)]]
[(0,0), (1,1)] => [
[(0,0), (1,0)],
[(0,1), (1,1)]
]
[(0,0), (0,1), (1,0)] => (no solution)
[(0,0), (0,1), (0,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (1,1), (2,1)],
[(0,2), (1,2), (2,2)],
]
[(0,0), (0,2), (1,2)] => [
[(0,0), (1,0), (2,0)],
[(0,1), (0,2), (1,1)],
[(1,2), (2,1), (2,2)],
]
Scoring
This is code-golf, so shortest code wins.
code-golf combinatorics grid set-partitions
code-golf combinatorics grid set-partitions
asked 5 hours ago
Peter KageyPeter Kagey
773517
asked 5 hours ago
Peter KageyPeter Kagey
773517
asked 5 hours ago
Peter KageyPeter Kagey
773517
asked 5 hours ago
Peter KageyPeter Kagey
773517
asked 5 hours ago
Peter KageyPeter Kagey
773517
773517
$begingroup$
This was inspired by this Math Stack Exchange question.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
@Arnauld, it looks like for Shikaku puzzles, "the objective is to divide the grid into rectangular and square pieces". In this case, there is no such constraint.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
Sorry for the confusion. I think there might be a Shikaku challenge somewhere in the sandbox, or maybe I was planning to make one myself at some point -- I can't remember for sure. Either way, I thought it was the same thing at first glance.
$endgroup$
– Arnauld
5 hours ago
add a comment |
$begingroup$
This was inspired by this Math Stack Exchange question.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
@Arnauld, it looks like for Shikaku puzzles, "the objective is to divide the grid into rectangular and square pieces". In this case, there is no such constraint.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
Sorry for the confusion. I think there might be a Shikaku challenge somewhere in the sandbox, or maybe I was planning to make one myself at some point -- I can't remember for sure. Either way, I thought it was the same thing at first glance.
$endgroup$
– Arnauld
5 hours ago
$begingroup$
This was inspired by this Math Stack Exchange question.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
This was inspired by this Math Stack Exchange question.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
@Arnauld, it looks like for Shikaku puzzles, "the objective is to divide the grid into rectangular and square pieces". In this case, there is no such constraint.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
@Arnauld, it looks like for Shikaku puzzles, "the objective is to divide the grid into rectangular and square pieces". In this case, there is no such constraint.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
Sorry for the confusion. I think there might be a Shikaku challenge somewhere in the sandbox, or maybe I was planning to make one myself at some point -- I can't remember for sure. Either way, I thought it was the same thing at first glance.
$endgroup$
– Arnauld
5 hours ago
$begingroup$
Sorry for the confusion. I think there might be a Shikaku challenge somewhere in the sandbox, or maybe I was planning to make one myself at some point -- I can't remember for sure. Either way, I thought it was the same thing at first glance.
$endgroup$
– Arnauld
5 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
JavaScript (ES6), 163 bytes
Prints all possible solutions as matrices containing 1-indexed values that describe the partition. (Or prints nothing if there's no solution.)
a=>(m=a.map(_=>[...a]),g=(n,[X,Y]=a[n++],j=0)=>a[j]?m.map((r,y)=>r.map((v,x)=>++v|(X-x)**2+(Y-y)**2-!!j?0:r[g(r[x]=n,[x,y],j+1),x]=v)):a[n]?g(n):console.log(m))(0)
Try it online!
answered 4 hours ago
ArnauldArnauld
73.9k690310
$endgroup$
add a comment |
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1 Answer
1
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1 Answer
1
active
oldest
votes
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oldest
votes
active
oldest
votes
$begingroup$
JavaScript (ES6), 163 bytes
Prints all possible solutions as matrices containing 1-indexed values that describe the partition. (Or prints nothing if there's no solution.)
a=>(m=a.map(_=>[...a]),g=(n,[X,Y]=a[n++],j=0)=>a[j]?m.map((r,y)=>r.map((v,x)=>++v|(X-x)**2+(Y-y)**2-!!j?0:r[g(r[x]=n,[x,y],j+1),x]=v)):a[n]?g(n):console.log(m))(0)
Try it online!
answered 4 hours ago
ArnauldArnauld
73.9k690310
$endgroup$
add a comment |
$begingroup$
JavaScript (ES6), 163 bytes
Prints all possible solutions as matrices containing 1-indexed values that describe the partition. (Or prints nothing if there's no solution.)
a=>(m=a.map(_=>[...a]),g=(n,[X,Y]=a[n++],j=0)=>a[j]?m.map((r,y)=>r.map((v,x)=>++v|(X-x)**2+(Y-y)**2-!!j?0:r[g(r[x]=n,[x,y],j+1),x]=v)):a[n]?g(n):console.log(m))(0)
Try it online!
answered 4 hours ago
ArnauldArnauld
73.9k690310
$endgroup$
add a comment |
$begingroup$
JavaScript (ES6), 163 bytes
Prints all possible solutions as matrices containing 1-indexed values that describe the partition. (Or prints nothing if there's no solution.)
a=>(m=a.map(_=>[...a]),g=(n,[X,Y]=a[n++],j=0)=>a[j]?m.map((r,y)=>r.map((v,x)=>++v|(X-x)**2+(Y-y)**2-!!j?0:r[g(r[x]=n,[x,y],j+1),x]=v)):a[n]?g(n):console.log(m))(0)
Try it online!
answered 4 hours ago
ArnauldArnauld
73.9k690310
$endgroup$
JavaScript (ES6), 163 bytes
Prints all possible solutions as matrices containing 1-indexed values that describe the partition. (Or prints nothing if there's no solution.)
a=>(m=a.map(_=>[...a]),g=(n,[X,Y]=a[n++],j=0)=>a[j]?m.map((r,y)=>r.map((v,x)=>++v|(X-x)**2+(Y-y)**2-!!j?0:r[g(r[x]=n,[x,y],j+1),x]=v)):a[n]?g(n):console.log(m))(0)
Try it online!
answered 4 hours ago
ArnauldArnauld
73.9k690310
answered 4 hours ago
ArnauldArnauld
73.9k690310
answered 4 hours ago
ArnauldArnauld
73.9k690310
answered 4 hours ago
ArnauldArnauld
73.9k690310
73.9k690310
add a comment |
add a comment |
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$begingroup$
This was inspired by this Math Stack Exchange question.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
@Arnauld, it looks like for Shikaku puzzles, "the objective is to divide the grid into rectangular and square pieces". In this case, there is no such constraint.
$endgroup$
– Peter Kagey
5 hours ago
$begingroup$
Sorry for the confusion. I think there might be a Shikaku challenge somewhere in the sandbox, or maybe I was planning to make one myself at some point -- I can't remember for sure. Either way, I thought it was the same thing at first glance.
$endgroup$
– Arnauld
5 hours ago