54 lines
1,004 B
Elixir
54 lines
1,004 B
Elixir
defmodule Day1 do
|
|
def get_answer(state) do
|
|
elem(state, 1) |>
|
|
Enum.reduce(0, fn i, acc -> i + acc end)
|
|
end
|
|
|
|
def init_state() do
|
|
{nil, [0, 0, 0]}
|
|
end
|
|
|
|
def execute(line, state) do
|
|
apply_command(
|
|
line |> to_command(),
|
|
state)
|
|
end
|
|
|
|
defp apply_command(command, state) do
|
|
case command do
|
|
{:add, n} -> apply_add(n, state)
|
|
{:reset} -> apply_reset(state)
|
|
end
|
|
end
|
|
|
|
defp to_command(s) do
|
|
try do
|
|
{:add, s |> String.trim() |> String.to_integer()}
|
|
rescue
|
|
ArgumentError -> {:reset}
|
|
end
|
|
end
|
|
|
|
defp apply_add(n, state) do
|
|
{current, total} = state
|
|
new_current = n + if is_nil(current) do 0 else current end
|
|
|
|
{new_current, total}
|
|
end
|
|
|
|
defp take_top_three(n, list) do
|
|
[ n | list ] |>
|
|
Enum.sort(:desc) |>
|
|
Enum.take(3)
|
|
end
|
|
|
|
defp apply_reset(state) do
|
|
{current, total} = state
|
|
if !is_nil(current) do
|
|
{nil, take_top_three(current, total)}
|
|
else
|
|
state
|
|
end
|
|
end
|
|
end
|
|
|