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Erlang & Elixir Fest 2018 gumi quiz mission 3
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defmodule Gumimaze do | |
def read() do | |
lines = "maze.txt" |> File.read!() |> String.trim() |> String.split("\n") | |
for {line, y} <- Enum.with_index(lines), {c, x} <- Enum.with_index(String.to_charlist(line)), into: %{} do | |
{{x, y}, c} | |
end | |
end | |
def solve3(maze) do | |
{x, y} = elem(Enum.find(maze, fn {_, v} -> v == ?S end), 0) | |
solve3_supervisor(maze, x, y) | |
|> Enum.max | |
end | |
defp solve3_supervisor(maze,x,y) do | |
_ = spawn(Gumimaze, :walk3, [self(), maze, x, y, %{}, 0]) | |
solve3_supervisor([]) | |
end | |
defp solve3_supervisor(score_list) do | |
receive do | |
{:ok, pt} -> | |
solve3_supervisor([pt | score_list]) | |
{:error, _ } -> | |
solve3_supervisor(score_list) | |
after 100 -> | |
score_list | |
end | |
end | |
def walk3(parent_id, maze, x, y, walked, pt) do | |
walked = Map.put(walked, {x, y}, true) | |
for {x2, y2} <- [{x + 1, y}, {x, y + 1}, {x - 1, y}, {x, y - 1}] do | |
case {walked[{x2, y2}], maze[{x2, y2}]} do | |
{true, _} -> send(parent_id, {:error, :walked}) | |
{_, ?W} -> send(parent_id, {:error, :wall}) | |
{_, ?\s} -> spawn(Gumimaze, :walk3, [parent_id, maze, x2, y2, walked, pt]) | |
{_, ?1} -> spawn(Gumimaze, :walk3, [parent_id, maze, x2, y2, walked, pt + 1]) | |
{_, ?G} -> send(parent_id, {:ok, pt}) | |
end | |
end | |
end | |
def main() do | |
Gumimaze.read() |> Gumimaze.solve3() |> IO.puts | |
end | |
end |
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