add day 10 (stinky)
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7 changed files with 394 additions and 0 deletions
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23/elixir/inputs/day10.txt
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23/elixir/inputs/day10.txt
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|
||||
|.J7.|FLF7|L7F|J.F7JLF-7|.FLLLJJLLJJJFJ|L-J7|J|7.LJLJ||LLFL-7||FJLJL7F7||||LJ||F-7|LJJ||J.|LL7LL-JLJJ|L||.|.FJJJ7JF--J|FLJL|||L||FJ-|.L-LF|.
|
||||
F-JL7FJ7FJLFJ|L7-L7L-7-J--|-.|7FJ7J|7L7L---7J-||-L7|L7..||L7LJLJ7F--J|LJLJ|F7|LJF|L-7-||7-|7J|7.|FLJ|L7LJ--77-7.J.J777|JFJLJF-.F.|JF7|.|F-LJ
|
||||
77F|7||7.LF7-JLLJL-JF|J|LL|JFFL-7|7|FFJF7F-J--JJ7LJJ7J.F77JF-----JF-7L---7||LJLF-JF7|LLJ7JLJ|L7F|JL||.J|F|..J7LF7FJF|-L-|LF-JJ-|.|-L7-7-FJ.|
|
||||
|F77-J-77-FJ77F|7.|F|7L||FF7||||LJ-77L7|LJ777-|LL-J||FL-J.|L-7F7F-JF|F--7|LJJFLL-7|LJ.L||.|L||JFL7.JJF|--FJ7.L.|-JFLJ77FJ||.L7||.|L-LJJ.LFL7
|
||||
F7J|-|LF|-7L-7-FF.LJL77.F|LL|F-7.F7LF7LJ7JFL7.|7F-.LL-JF|-7J.LJ||F--J|F7|L7JLL.|FLJ||.F-LJ7-L--7L|-FLJJ|LLJ|7FF-.F7-|JF-7FL--LL-7|F|J|L7J|-J
|
||||
||L|F|.LJ7|J|L7JLF7LJ|FLJ|.|.-7L-L-7FJLJ-FJLJF7-|.F|-J-F-.L-7.LLJL--7LJ|L7|LJJF|FJ7|LJ-|7J|7||L|--.|J.--F7F|JFJ7.|JF7J.|--J7F7..JLJ7-|-|--.|
|
||||
L7LL|FL7L|..L7.LLLJJ--J|.J-JJF777||LJ7L|LL.|--.-JFJ|7LF7.F|F-F-7|JLFJF-J-LJ.LLL77.JJ7.-J|7JL--JLJJ|LFF77|-FJF-.-.||LL--||FLFLJ7J.7J.L7F|.FF7
|
||||
L|77|JF|7LF-L|F77-|-FLL|.L-J.LL|7J7LFF7L7..L7.-JJF7.FFJ-J-F|7-L-F--L7L-7J|-7|-F||-7LJ7L7L|7-FLFF-7L|.LLJJJJ.|J|.7F|7F-JF7--|.L||F|LJ-FLJFL-7
|
||||
F|-LJ|FJJF-J|.L|J7J.LJ|J.L|7..|LLFJ7L||-L7|.LLJ.FL|-|J.L|F-|7|.||FF-L--J---JF--7JF7-||JFJLJ.FFLJ.-7LJ-L7.7--F7JLF7L-|F7JLJ..F7L7JLFLLF7FLF|J
|
||||
F|-|.-JL--7F-7F|FL77|.-.FLF7.L|FFJFL-|J..LJ-FJ7L-.J-7.7-J.LLL-JJJF||.L|LLFL7LF..F7.F|L-7|J|--J|L.|7L|J|F||F7|F7LJ|-LFF-J|7LLJJ7||-J|LLJ7-77.
|
||||
LL-JJJ.7JL7J.|-.L--77-L|JLFJ7.L-7JL.L|J.--7.L-JJJ.L.L7--LJ-|JJLLFFJJ-LL-7JLL.J-L-.F-7JJFF.L-LJL-77-F--J-L7L-LLL-LLJ.JJ|LF-J--JLFL.7JJLLJ-L.F
|
||||
5
23/elixir/inputs/day10_example1.txt
Normal file
5
23/elixir/inputs/day10_example1.txt
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
-L|F7
|
||||
7S-7|
|
||||
L|7||
|
||||
-L-J|
|
||||
L|-JF
|
||||
5
23/elixir/inputs/day10_example2.txt
Normal file
5
23/elixir/inputs/day10_example2.txt
Normal file
|
|
@ -0,0 +1,5 @@
|
|||
7-F7-
|
||||
.FJ|7
|
||||
SJLL7
|
||||
|F--J
|
||||
LJ.LJ
|
||||
9
23/elixir/inputs/day10_example3.txt
Normal file
9
23/elixir/inputs/day10_example3.txt
Normal file
|
|
@ -0,0 +1,9 @@
|
|||
...........
|
||||
.S-------7.
|
||||
.|F-----7|.
|
||||
.||.....||.
|
||||
.||.....||.
|
||||
.|L-7.F-J|.
|
||||
.|..|.|..|.
|
||||
.L--J.L--J.
|
||||
...........
|
||||
10
23/elixir/inputs/day10_example4.txt
Normal file
10
23/elixir/inputs/day10_example4.txt
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
.F----7F7F7F7F-7....
|
||||
.|F--7||||||||FJ....
|
||||
.||.FJ||||||||L7....
|
||||
FJL7L7LJLJ||LJ.L-7..
|
||||
L--J.L7...LJS7F-7L7.
|
||||
....F-J..F7FJ|L7L7L7
|
||||
....L7.F7||L7|.L7L7|
|
||||
.....|FJLJ|FJ|F7|.LJ
|
||||
....FJL-7.||.||||...
|
||||
....L---J.LJ.LJLJ...
|
||||
10
23/elixir/inputs/day10_example5.txt
Normal file
10
23/elixir/inputs/day10_example5.txt
Normal file
|
|
@ -0,0 +1,10 @@
|
|||
FF7FSF7F7F7F7F7F---7
|
||||
L|LJ||||||||||||F--J
|
||||
FL-7LJLJ||||||LJL-77
|
||||
F--JF--7||LJLJ7F7FJ-
|
||||
L---JF-JLJ.||-FJLJJ7
|
||||
|F|F-JF---7F7-L7L|7|
|
||||
|FFJF7L7F-JF7|JL---7
|
||||
7-L-JL7||F7|L7F-7F7|
|
||||
L.L7LFJ|||||FJL7||LJ
|
||||
L7JLJL-JLJLJL--JLJ.L
|
||||
215
23/elixir/lib/days/day10.ex
Normal file
215
23/elixir/lib/days/day10.ex
Normal file
|
|
@ -0,0 +1,215 @@
|
|||
defmodule AOC.Day10 do
|
||||
# use AOC.Day, day: 10, input: "example5"
|
||||
use AOC.Day, day: 10
|
||||
|
||||
def parse_input(lines) do
|
||||
pipe_map =
|
||||
lines
|
||||
|> Enum.with_index()
|
||||
|> Enum.flat_map(fn {row, y} ->
|
||||
row
|
||||
|> String.to_charlist()
|
||||
|> Enum.with_index()
|
||||
|> Enum.map(fn {tile, x} -> {{y, x}, tile} end)
|
||||
end)
|
||||
|> Enum.into(%{})
|
||||
|
||||
connection_map =
|
||||
Enum.map(pipe_map, fn {coords, tile} ->
|
||||
connections =
|
||||
case tile do
|
||||
?| -> [:north, :south]
|
||||
?- -> [:east, :west]
|
||||
?L -> [:north, :east]
|
||||
?J -> [:north, :west]
|
||||
?7 -> [:south, :west]
|
||||
?F -> [:south, :east]
|
||||
?. -> []
|
||||
?S -> []
|
||||
end
|
||||
|
||||
{coords, connections}
|
||||
end)
|
||||
|> Enum.into(%{})
|
||||
|
||||
{start_location, start_connections} = find_start_connections(pipe_map)
|
||||
|
||||
{pipe_map, connection_map, start_location, start_connections}
|
||||
end
|
||||
|
||||
def find_start_connections(pipe_map) do
|
||||
{start_y, start_x} =
|
||||
start_location =
|
||||
pipe_map
|
||||
|> Enum.find(&(elem(&1, 1) == ?S))
|
||||
|> elem(0)
|
||||
|
||||
start_connections =
|
||||
[
|
||||
{{start_y - 1, start_x}, ~c"|7F"},
|
||||
{{start_y, start_x + 1}, ~c"-J7"},
|
||||
{{start_y + 1, start_x}, ~c"|LJ"},
|
||||
{{start_y, start_x - 1}, ~c"-LF"}
|
||||
]
|
||||
|> Enum.filter(&Map.has_key?(pipe_map, elem(&1, 0)))
|
||||
|> Enum.filter(fn {coords, allowed_pipes} ->
|
||||
pipe = Map.fetch!(pipe_map, coords)
|
||||
Enum.member?(allowed_pipes, pipe)
|
||||
end)
|
||||
|> Enum.map(&elem(&1, 0))
|
||||
|
||||
{start_location, start_connections}
|
||||
end
|
||||
|
||||
def find_furthest_pipe(connection_map, start_location, start_connections) do
|
||||
:ets.insert(:pipe_distances, {start_location, 0})
|
||||
Enum.each(start_connections, &visit_pipe(connection_map, &1, 1))
|
||||
|
||||
:ets.tab2list(:pipe_distances)
|
||||
|> Enum.map(&elem(&1, 1))
|
||||
|> Enum.max()
|
||||
end
|
||||
|
||||
def visit_pipe(connection_map, {y, x} = location, step_count) do
|
||||
case Map.fetch(connection_map, location) do
|
||||
{:ok, directions} ->
|
||||
location_step_count =
|
||||
case :ets.lookup(:pipe_distances, location) do
|
||||
[{_, location_step_count}] -> location_step_count
|
||||
_ -> :infinity
|
||||
end
|
||||
|
||||
if step_count < location_step_count do
|
||||
:ets.insert(:pipe_distances, {location, step_count})
|
||||
|
||||
Enum.each(directions, fn
|
||||
:north -> visit_pipe(connection_map, {y - 1, x}, step_count + 1)
|
||||
:east -> visit_pipe(connection_map, {y, x + 1}, step_count + 1)
|
||||
:south -> visit_pipe(connection_map, {y + 1, x}, step_count + 1)
|
||||
:west -> visit_pipe(connection_map, {y, x - 1}, step_count + 1)
|
||||
end)
|
||||
end
|
||||
|
||||
:error ->
|
||||
:ok
|
||||
end
|
||||
end
|
||||
|
||||
def part1({_, connection_map, start_location, start_connections}) do
|
||||
:ets.new(:pipe_distances, [:set, :protected, :named_table])
|
||||
|
||||
find_furthest_pipe(connection_map, start_location, start_connections)
|
||||
end
|
||||
|
||||
def count_enclosed(pipe_map, connection_map, start_location, start_connections) do
|
||||
next_location = tl(start_connections) |> hd()
|
||||
# next_location = hd(start_connections)
|
||||
|
||||
count_enclosed(pipe_map, connection_map, start_location, start_location, next_location)
|
||||
end
|
||||
|
||||
def count_enclosed(
|
||||
pipe_map,
|
||||
connection_map,
|
||||
start_location,
|
||||
{prev_y, prev_x} = previous_location,
|
||||
{y, x} = current_location
|
||||
) do
|
||||
if current_location != start_location do
|
||||
directions = Map.fetch!(connection_map, current_location)
|
||||
|
||||
# Always take RIGHT hand side
|
||||
|
||||
if Enum.member?(directions, :east) and Enum.member?(directions, :west) do
|
||||
if prev_x < x do
|
||||
# We came from the east
|
||||
flood_fill_ground(pipe_map, start_location, {y + 1, x})
|
||||
else
|
||||
# We came from the west
|
||||
flood_fill_ground(pipe_map, start_location, {y - 1, x})
|
||||
end
|
||||
end
|
||||
|
||||
if Enum.member?(directions, :north) and Enum.member?(directions, :south) do
|
||||
if prev_y < y do
|
||||
# We came from the north
|
||||
flood_fill_ground(pipe_map, start_location, {y, x - 1})
|
||||
else
|
||||
# We came from the south
|
||||
flood_fill_ground(pipe_map, start_location, {y, x + 1})
|
||||
end
|
||||
end
|
||||
|
||||
if Enum.member?(directions, :north) and Enum.member?(directions, :east) and prev_y < y do
|
||||
flood_fill_ground(pipe_map, start_location, {y, x - 1})
|
||||
flood_fill_ground(pipe_map, start_location, {y + 1, x})
|
||||
end
|
||||
|
||||
if Enum.member?(directions, :east) and Enum.member?(directions, :south) and prev_x > x do
|
||||
flood_fill_ground(pipe_map, start_location, {y - 1, x})
|
||||
flood_fill_ground(pipe_map, start_location, {y, x - 1})
|
||||
end
|
||||
|
||||
if Enum.member?(directions, :south) and Enum.member?(directions, :west) and prev_y > y do
|
||||
flood_fill_ground(pipe_map, start_location, {y, x + 1})
|
||||
flood_fill_ground(pipe_map, start_location, {y - 1, x})
|
||||
end
|
||||
|
||||
if Enum.member?(directions, :west) and Enum.member?(directions, :north) and prev_x < x do
|
||||
flood_fill_ground(pipe_map, start_location, {y + 1, x})
|
||||
flood_fill_ground(pipe_map, start_location, {y, x + 1})
|
||||
end
|
||||
|
||||
next_location =
|
||||
Enum.map(directions, fn
|
||||
:north -> {y - 1, x}
|
||||
:east -> {y, x + 1}
|
||||
:south -> {y + 1, x}
|
||||
:west -> {y, x - 1}
|
||||
end)
|
||||
|> Enum.reject(&(&1 == previous_location))
|
||||
|> hd()
|
||||
|
||||
count_enclosed(pipe_map, connection_map, start_location, current_location, next_location)
|
||||
end
|
||||
end
|
||||
|
||||
def flood_fill_ground(pipe_map, start_location, {y, x} = location) do
|
||||
if location != start_location do
|
||||
case Map.fetch(pipe_map, location) do
|
||||
{:ok, _} ->
|
||||
case :ets.lookup(:pipe_distances, location) do
|
||||
[] ->
|
||||
case :ets.lookup(:enclosed_pipes, location) do
|
||||
[] ->
|
||||
:ets.insert(:enclosed_pipes, {location, 1})
|
||||
|
||||
[{y - 1, x}, {y, x + 1}, {y + 1, x}, {y, x - 1}]
|
||||
|> Enum.each(&flood_fill_ground(pipe_map, start_location, &1))
|
||||
|
||||
_ ->
|
||||
:ok
|
||||
end
|
||||
|
||||
_ ->
|
||||
:ok
|
||||
end
|
||||
|
||||
_ ->
|
||||
:ok
|
||||
end
|
||||
end
|
||||
end
|
||||
|
||||
def part2({pipe_map, connection_map, start_location, start_connections}) do
|
||||
:ets.new(:enclosed_pipes, [:set, :protected, :named_table])
|
||||
|
||||
count_enclosed(pipe_map, connection_map, start_location, start_connections)
|
||||
|
||||
:ets.tab2list(:enclosed_pipes)
|
||||
|> Enum.count()
|
||||
|> IO.inspect()
|
||||
|
||||
"TODO"
|
||||
end
|
||||
end
|
||||
Loading…
Reference in a new issue