22 lines
585 B
Elixir
22 lines
585 B
Elixir
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defmodule Day2Part1 do
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def run do
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regex = ~r/\A(\d+)-(\d+) (\w): (\w+)\z/
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File.read!("input")
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|> String.trim()
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|> String.split("\n")
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|> Enum.map(&Regex.run(regex, &1, capture: :all_but_first))
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|> Enum.map(fn [least, most, char, password] ->
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{String.to_integer(least), String.to_integer(most), char, password}
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end)
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|> Enum.filter(fn {least, most, char, password} ->
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count = Enum.count(String.graphemes(password), &(&1 == char))
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least <= count && count <= most
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end)
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|> Enum.count()
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|> IO.puts()
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end
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end
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Day2Part1.run()
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