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defmodule AOC.Day21 do
# use AOC.Day, day: 21, input: "example"
use AOC.Day, day: 21
def parse_input(lines) do
map =
lines
|> Enum.with_index()
|> Enum.flat_map(fn {line, y} ->
line
|> String.to_charlist()
|> Enum.with_index()
|> Enum.map(fn {tile, x} -> {{y, x}, tile} end)
end)
|> Enum.into(%{})
start_position =
map
|> Enum.find(fn {_, tile} -> tile == ?S end)
|> elem(0)
{Map.put(map, start_position, ?.), start_position}
end
def walk(map, start_position, steps) do
map
|> do_walk(start_position, steps)
|> Enum.count()
end
def do_walk(map, position, _) when not is_map_key(map, position), do: []
def do_walk(map, position, _) when :erlang.map_get(position, map) == ?#, do: []
def do_walk(_map, position, 0), do: [position]
def do_walk(map, {y, x} = position, steps_left) do
case :ets.lookup(:steps_memo, {position, steps_left}) do
[] ->
reachable =
[{y - 1, x}, {y, x + 1}, {y + 1, x}, {y, x - 1}]
|> Enum.flat_map(fn neighbor_position ->
do_walk(map, neighbor_position, steps_left - 1)
end)
|> Enum.uniq()
:ets.insert(:steps_memo, {{position, steps_left}, reachable})
reachable
[{_, reachable}] ->
reachable
end
end
def part1({map, start_position}) do
:ets.new(:steps_memo, [:named_table])
map
|> walk(start_position, 64)
|> IO.inspect()
"TODO"
end
def part2(_input) do
"TODO"
end
end