28 lines
694 B
Elixir
28 lines
694 B
Elixir
defmodule Day2Part2 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 [first, second, char, password] ->
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{
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String.to_integer(first) - 1,
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String.to_integer(second) - 1,
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char,
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String.graphemes(password)
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}
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end)
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|> Enum.filter(fn {first, second, char, password} ->
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first = Enum.at(password, first) == char
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second = Enum.at(password, second) == char
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(first && !second) || (!first && second)
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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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Day2Part2.run()
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