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FP.Recursion.Advanced — hackerrank v0.1.0
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FP.Recursion.Advanced
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Elixir solutions for advanced HackerRank functional programming challenges: recursions.
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<
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Functions
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class
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summary-row
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<
div
class
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summary-signature
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<
a
href
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#convex_hull_perimeter/1
"
>
convex_hull_perimeter(points)
</
a
>
</
div
>
<
div
class
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summary-synopsis
"
>
<
p
>
Convex hull
</
p
>
</
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>
</
div
>
<
div
class
="
summary-row
"
>
<
div
class
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summary-signature
"
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<
a
href
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#cross_words/2
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>
cross_words(grid, words)
</
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>
</
div
>
<
div
class
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summary-synopsis
"
>
<
p
>
Crosswords-101
</
p
>
</
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>
</
div
>
<
div
class
="
summary-row
"
>
<
div
class
="
summary-signature
"
>
<
a
href
="
#draw_trees/1
"
>
draw_trees(iterations)
</
a
>
</
div
>
<
div
class
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summary-synopsis
"
>
<
p
>
Functions and Fractals - Recursive Trees
</
p
>
</
div
>
</
div
>
<
div
class
="
summary-row
"
>
<
div
class
="
summary-signature
"
>
<
a
href
="
#draw_triangles/1
"
>
draw_triangles(iterations)
</
a
>
</
div
>
<
div
class
="
summary-synopsis
"
>
<
p
>
Functions and fractals: Sierpinski triangle
</
p
>
</
div
>
</
div
>
<
div
class
="
summary-row
"
>
<
div
class
="
summary-signature
"
>
<
a
href
="
#graham_scan/1
"
>
graham_scan(points)
</
a
>
</
div
>
<
div
class
="
summary-synopsis
"
>
<
p
>
Graham Scan - find points of a convex hull from a series of coordinates
</
p
>
</
div
>
</
div
>
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class
="
summary-row
"
>
<
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class
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"
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href
="
#super_digit/2
"
>
super_digit(n, k)
</
a
>
</
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>
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class
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"
>
<
p
>
Super digit
</
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>
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sequences()
</
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<
div
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"
>
<
pre
>
sequences() :: [
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
tuple
</
a
>
()]
</
pre
>
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class
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solution()
</
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<
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class
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"
>
<
pre
>
solution() :: [{
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
char
</
a
>
(),
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
tuple
</
a
>
()}]
</
pre
>
</
div
>
</
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>
<
section
class
="
docstring
"
>
</
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>
</
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>
</
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>
</
section
>
<
section
id
="
functions
"
class
="
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"
>
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class
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"
>
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a
class
="
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"
href
="
#functions
"
>
<
span
class
="
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"
aria-hidden
="
true
"
>
</
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>
<
span
class
="
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"
>
Link to this section
</
span
>
</
a
>
Functions
</
h1
>
<
div
class
="
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"
>
<
section
class
="
detail
"
id
="
convex_hull_perimeter/1
"
>
<
div
class
="
detail-header
"
>
<
a
href
="
#convex_hull_perimeter/1
"
class
="
detail-link
"
title
="
Link to this function
"
>
<
span
class
="
icon-link
"
aria-hidden
="
true
"
>
</
span
>
<
span
class
="
sr-only
"
>
Link to this function
</
span
>
</
a
>
<
h1
class
="
signature
"
>
convex_hull_perimeter(points)
</
span
>
<
div
class
="
specs
"
>
<
pre
>
convex_hull_perimeter([
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
tuple
</
a
>
()]) ::
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
number
</
a
>
()
</
pre
>
</
div
>
</
div
>
<
section
class
="
docstring
"
>
<
p
>
Convex hull
</
p
>
<
p
>
https://www.hackerrank.com/challenges/convex-hull-fp/problem
</
p
>
<
p
>
Find the perimeter of a convex hull from a series of coordinates,
opted to implement Graham's scan algorithm.
https://en.wikipedia.org/wiki/Graham_scan
</
p
>
</
section
>
</
section
>
<
section
class
="
detail
"
id
="
cross_words/2
"
>
<
div
class
="
detail-header
"
>
<
a
href
="
#cross_words/2
"
class
="
detail-link
"
title
="
Link to this function
"
>
<
span
class
="
icon-link
"
aria-hidden
="
true
"
>
</
span
>
<
span
class
="
sr-only
"
>
Link to this function
</
span
>
</
a
>
<
h1
class
="
signature
"
>
cross_words(grid, words)
</
span
>
<
div
class
="
specs
"
>
<
pre
>
cross_words(
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
list
</
a
>
(),
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
list
</
a
>
()) ::
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
list
</
a
>
()
</
pre
>
</
div
>
</
div
>
<
section
class
="
docstring
"
>
<
p
>
Crosswords-101
</
p
>
<
p
>
https://www.hackerrank.com/challenges/crosswords-101/problem
</
p
>
</
section
>
</
section
>
<
section
class
="
detail
"
id
="
draw_trees/1
"
>
<
div
class
="
detail-header
"
>
<
a
href
="
#draw_trees/1
"
class
="
detail-link
"
title
="
Link to this function
"
>
<
span
class
="
icon-link
"
aria-hidden
="
true
"
>
</
span
>
<
span
class
="
sr-only
"
>
Link to this function
</
span
>
</
a
>
<
h1
class
="
signature
"
>
draw_trees(iterations)
</
span
>
<
div
class
="
specs
"
>
<
pre
>
draw_trees(
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
integer
</
a
>
()) ::
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
list
</
a
>
()
</
pre
>
</
div
>
</
div
>
<
section
class
="
docstring
"
>
<
p
>
Functions and Fractals - Recursive Trees
</
p
>
<
p
>
https://www.hackerrank.com/challenges/fractal-trees/problem
</
p
>
</
section
>
</
section
>
<
section
class
="
detail
"
id
="
draw_triangles/1
"
>
<
div
class
="
detail-header
"
>
<
a
href
="
#draw_triangles/1
"
class
="
detail-link
"
title
="
Link to this function
"
>
<
span
class
="
icon-link
"
aria-hidden
="
true
"
>
</
span
>
<
span
class
="
sr-only
"
>
Link to this function
</
span
>
</
a
>
<
h1
class
="
signature
"
>
draw_triangles(iterations)
</
span
>
<
div
class
="
specs
"
>
<
pre
>
draw_triangles(
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
integer
</
a
>
()) ::
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#built-in-types
"
>
list
</
a
>
()
</
pre
>
</
div
>
</
div
>
<
section
class
="
docstring
"
>
<
p
>
Functions and fractals: Sierpinski triangle
</
p
>
<
p
>
https://www.hackerrank.com/challenges/functions-and-fractals-sierpinski-triangles/proble
</
p
>
</
section
>
</
section
>
<
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class
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"
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graham_scan/1
"
>
<
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<
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#graham_scan/1
"
class
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Link to this function
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<
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class
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graham_scan(points)
</
span
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<
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specs
"
>
<
pre
>
graham_scan([
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
tuple
</
a
>
()]) :: [
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
tuple
</
a
>
()]
</
pre
>
</
div
>
</
div
>
<
section
class
="
docstring
"
>
<
p
>
Graham Scan - find points of a convex hull from a series of coordinates
</
p
>
<
p
>
See https://en.wikipedia.org/wiki/Graham_scan
</
p
>
<
p
>
For https://www.hackerrank.com/challenges/convex-hull-fp/problem
</
p
>
</
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>
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section
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super_digit/2
"
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#super_digit/2
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super_digit(n, k)
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"
>
<
pre
>
super_digit(
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
integer
</
a
>
(),
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
integer
</
a
>
()) ::
<
a
href
="
https://hexdocs.pm/elixir/typespecs.html#basic-types
"
>
integer
</
a
>
()
</
pre
>
</
div
>
</
div
>
<
section
class
="
docstring
"
>
<
p
>
Super digit
</
p
>
<
p
>
https://www.hackerrank.com/challenges/super-digit/problem
</
p
>
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section
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