37 lines
1,008 B
Elixir
37 lines
1,008 B
Elixir
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defmodule AOC.Day2 do
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def parse_line(line) do
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[min, max, char, password] = String.split(line, [" ", "-", ":"], trim: true)
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password = String.to_charlist(password)
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[char] = String.to_charlist(char)
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min = String.to_integer(min)
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max = String.to_integer(max)
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[password, char, min, max]
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end
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def validate_password1(password, char, min, max) do
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count = Enum.count(password, &(&1 == char))
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count in min..max
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end
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def part1 do
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AOC.Util.input_lines(2, 1)
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|> Enum.map(&parse_line/1)
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|> Enum.map(&apply(__MODULE__, :validate_password1, &1))
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|> Enum.count(&Function.identity/1)
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end
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def validate_password2(password, char, pos1, pos2) do
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m1 = Enum.at(password, pos1 - 1) == char
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m2 = Enum.at(password, pos2 - 1) == char
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(m1 or m2) and not (m1 and m2)
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end
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def part2 do
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AOC.Util.input_lines(2, 1)
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|> Enum.map(&parse_line/1)
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|> Enum.map(&apply(__MODULE__, :validate_password2, &1))
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|> Enum.count(&Function.identity/1)
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end
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end
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