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Day 3 Part 1

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Jeremy Kaplan 2020-12-02 23:46:51 -08:00
commit 24f66ec52c
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2020/day3/day3.ex Normal file
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defmodule TreeMap do
def start_link(map_text) do
Task.start_link(fn -> loop(parse(map_text)) end)
end
defp parse(text) do
String.split(text, "\n", trim: true)
|> Enum.with_index()
|> Enum.reduce(%{grid: %{}, width: 0, height: 0}, fn {line, r}, map ->
String.codepoints(line)
|> Enum.with_index()
|> Enum.reduce(map, fn {char, c}, map ->
%{
grid: Map.put(map.grid, {r, c}, char_to_content(char)),
width: max(map.width, c + 1),
height: max(map.height, r + 1)
}
end)
end)
end
defp loop(map) do
receive do
{:get, {r, c}, caller} ->
send(caller, Map.fetch(map.grid, wrap({r, c}, {map.width, map.height})))
loop(map)
end
end
defp wrap({r, c}, {w, _h}) do
{r, rem(c, w)}
end
defp char_to_content(char) do
case char do
"." -> :open
"#" -> :tree
end
end
end
defmodule Day2 do
defp read_input do
Path.expand('input', Path.dirname(__ENV__.file))
|> File.read!()
end
defp content(tree_map, {r, c}) do
send(tree_map, {:get, {r, c}, self()})
receive do
{:ok, content} -> content
:error -> :error
end
end
def part1 do
{:ok, tree_map} = TreeMap.start_link(read_input)
Stream.iterate({0, 0}, fn {r, c} -> {r + 1, c + 3} end)
|> Enum.reduce_while(0, fn cell, tree_count ->
case content(tree_map, cell) do
:error -> {:halt, tree_count}
:open -> {:cont, tree_count}
:tree -> {:cont, tree_count + 1}
end
end)
end
end
Day2.part1() |> IO.inspect()

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