83 lines
1.9 KiB
Elixir
83 lines
1.9 KiB
Elixir
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defmodule AOC.Day4 do
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def parse_input(lines), do: parse_input(lines, [], %{})
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def parse_input([], acc, el), do: [el | acc]
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def parse_input(["" | tl], acc, el), do: parse_input(tl, [el | acc], %{})
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def parse_input([hd | tl], acc, el) do
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el =
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String.split(hd)
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|> Enum.map(&String.split(&1, ":"))
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|> Enum.map(fn [k, v] -> {k, v} end)
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|> Enum.into(el)
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parse_input(tl, acc, el)
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end
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def validate_field_presence(%{
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"byr" => _,
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"iyr" => _,
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"eyr" => _,
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"hgt" => _,
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"hcl" => _,
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"ecl" => _,
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"pid" => _
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}),
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do: true
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def validate_field_presence(_), do: false
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def part1 do
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AOC.Util.input_lines(4, 1)
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|> parse_input()
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|> Enum.filter(&validate_field_presence/1)
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|> Enum.count()
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end
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def validate_height(height) do
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if String.ends_with?(height, ["cm", "in"]) do
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{height, measure} = String.split_at(height, -2)
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height = String.to_integer(height)
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case measure do
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"cm" -> height >= 150 and height <= 193
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"in" -> height >= 59 and height <= 76
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end
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else
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false
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end
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end
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def validate_fields(%{
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"byr" => byr,
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"iyr" => iyr,
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"eyr" => eyr,
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"hgt" => hgt,
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"hcl" => hcl,
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"ecl" => ecl,
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"pid" => pid
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}) do
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byr = String.to_integer(byr)
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iyr = String.to_integer(iyr)
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eyr = String.to_integer(eyr)
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[
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byr >= 1920 and byr <= 2002,
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iyr >= 2010 and iyr <= 2020,
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eyr >= 2020 and eyr <= 2030,
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validate_height(hgt),
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hcl =~ ~r/^#([a-f]|[0-9]){6}$/,
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ecl in ["amb", "blu", "brn", "gry", "grn", "hzl", "oth"],
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pid =~ ~r/^[0-9]{9}$/
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]
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|> Enum.reduce(&and/2)
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end
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def part2 do
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AOC.Util.input_lines(4, 1)
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|> parse_input()
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|> Enum.filter(&validate_field_presence/1)
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|> Enum.filter(&validate_fields/1)
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|> Enum.count()
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end
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end
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