66 lines
1.0 KiB
Elixir
66 lines
1.0 KiB
Elixir
defmodule Day6 do
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@example """
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abc
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a
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b
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c
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ab
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ac
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a
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a
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a
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a
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b
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"""
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def part1(example \\ false) do
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parse_input(example)
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|> Enum.map(&questions_with_any_yes/1)
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|> Enum.map(&MapSet.size/1)
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|> Enum.sum()
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end
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def part2(example \\ false) do
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parse_input(example)
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|> Enum.map(&questions_with_all_yes/1)
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|> Enum.map(&MapSet.size/1)
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|> Enum.sum()
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end
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def parse_input(example) do
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if(example, do: @example, else: File.read!("lib/day6/input.txt"))
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|> String.trim()
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|> String.split("\n\n")
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end
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def questions_with_any_yes(str) do
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str
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|> String.replace(~r/\s/, "")
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|> String.to_charlist()
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|> Enum.into(MapSet.new())
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end
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def questions_with_all_yes(str) do
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str
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|> String.split("\n")
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|> Enum.map(fn person ->
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person
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|> String.to_charlist()
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|> MapSet.new()
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end)
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|> Enum.reduce(nil, fn person, acc ->
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case acc do
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nil ->
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person
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_ ->
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MapSet.intersection(acc, person)
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end
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end)
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end
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end
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