57 lines
1,007 B
Elixir
57 lines
1,007 B
Elixir
defmodule Aoc.Solution.Day01 do
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@name "Day 1: Not Quite Lisp"
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@behaviour Solution
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@basement -1
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@impl Solution
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def get_name, do: @name
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@impl Solution
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def parse!(raw) do
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raw
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|> String.split("", trim: true)
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end
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@impl Solution
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def solve_first_part(input) do
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input
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|> Enum.map(fn d ->
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case d do
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"(" -> 1
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")" -> -1
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_ -> 0
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end
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end)
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|> Enum.sum()
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end
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@impl Solution
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def solve_second_part(input) do
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[change | changes] =
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input
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|> Enum.map(fn d ->
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case d do
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"(" -> 1
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")" -> -1
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_ -> 0
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end
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end)
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move(change, 1, 0, changes)
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end
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defp move(change, pos, current, []) do
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case current + change do
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@basement -> pos
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_ -> :basement_never_reached
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end
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end
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defp move(change, pos, current, [next | changes]) do
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case current + change do
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@basement -> pos
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_ -> move(next, pos + 1, current + change, changes)
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end
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end
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end
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