74 lines
1.6 KiB
Elixir
74 lines
1.6 KiB
Elixir
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defmodule Aoc.Solution.Day05 do
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@name "Day 5: Doesn't He Have Intern-Elves For This?"
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@behaviour Solution
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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()
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end
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@impl Solution
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def solve_first_part(strings) do
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strings
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|> Enum.map(fn s -> nice?(s) end)
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|> Enum.map(fn b ->
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if b, do: 1, else: 0
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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(strings) do
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strings
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|> Enum.map(fn s -> still_nice?(s) end)
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|> Enum.map(fn b ->
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if b, do: 1, else: 0
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end)
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|> Enum.sum()
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end
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defp nice?(subject) do
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Enum.all?([
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does_not_contain_the_strings(subject),
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contains_at_least_three_vowels(subject),
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contains_at_least_one_letter_pair(subject)
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])
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end
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defp still_nice?(subject) do
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Enum.all?([
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contains_a_letter_pair_without_overlapping(subject),
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contains_one_letter_pair_which_repeats_with_exactly_one_letter_between_them(subject)
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])
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end
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defp contains_at_least_three_vowels(subject) do
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r = ~r/[aeiou].*[aeiou].*[aeiou].*/
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String.match?(subject, r)
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end
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defp contains_at_least_one_letter_pair(subject) do
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r = ~r/(\w)\1/
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String.match?(subject, r)
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end
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defp does_not_contain_the_strings(subject) do
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r = ~r/ab|cd|pq|xy/
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not String.match?(subject, r)
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end
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defp contains_a_letter_pair_without_overlapping(subject) do
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r = ~r/(\w{2}).*\1/
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String.match?(subject, r)
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end
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defp contains_one_letter_pair_which_repeats_with_exactly_one_letter_between_them(subject) do
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r = ~r/(\w)\w\1/
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String.match?(subject, r)
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end
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end
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