42 lines
1.2 KiB
Elixir
42 lines
1.2 KiB
Elixir
defmodule DayDay21Part1 do
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def run do
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input =
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File.read!("input")
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|> String.split("\n", trim: true)
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|> Enum.map(&String.split(&1, [" (contains ", ", ", ")"], trim: true))
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|> Enum.map(fn [ingredients | allergens] -> {String.split(ingredients), allergens} end)
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known_allergens =
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input
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|> Enum.reduce(%{}, fn {ingredients, allergens}, acc ->
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ingredients = MapSet.new(ingredients)
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Enum.reduce(allergens, acc, fn allergen, acc ->
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Map.update(acc, allergen, ingredients, &MapSet.intersection(&1, ingredients))
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end)
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end)
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|> Enum.sort_by(fn {_allergen, ingredients} -> Enum.count(ingredients) end)
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all_ingredients = Enum.flat_map(input, fn {ingredients, _allergens} -> ingredients end)
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contains_allergens =
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known_allergens
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|> Enum.map(fn {_allergen, ingredients} -> ingredients end)
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|> Enum.reduce(&MapSet.union/2)
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no_allergens =
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all_ingredients
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|> MapSet.new()
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|> MapSet.difference(contains_allergens)
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|> MapSet.to_list()
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all_ingredients
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|> Enum.frequencies()
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|> Map.take(no_allergens)
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|> Map.values()
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|> Enum.sum()
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|> IO.inspect()
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end
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end
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DayDay21Part1.run()
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