Day1 faster
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1 changed files with 18 additions and 18 deletions
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@ -2,37 +2,37 @@ defmodule Day1 do
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def part1(input) do
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def part1(input) do
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input
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input
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|> Enum.map(fn line ->
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|> Enum.map(fn line ->
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numbers = String.replace(line, ~r/[^1-9]/, "")
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numbers = filter_digits(line)
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String.to_integer(String.first(numbers) <> String.last(numbers))
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String.to_integer(String.first(numbers) <> String.last(numbers))
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end)
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end)
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|> Enum.sum()
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|> Enum.sum()
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end
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end
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def filter_digits(<<>>), do: <<>>
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def filter_digits(<<x, rest::binary>>) when x in ?1..?9, do: <<x>> <> filter_digits(rest)
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def filter_digits(<<_, rest::binary>>), do: filter_digits(rest)
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def part2(input) do
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def part2(input) do
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input
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input
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|> Enum.map(fn line ->
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|> Enum.map(fn line ->
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numbers =
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numbers = filter_digits2(line)
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line
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|> string_to_digits()
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|> String.replace(~r/[^1-9]/, "")
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String.to_integer(String.first(numbers) <> String.last(numbers))
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String.to_integer(String.first(numbers) <> String.last(numbers))
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end)
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end)
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|> Enum.sum()
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|> Enum.sum()
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end
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end
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def string_to_digits(line) do
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def filter_digits2(<<>>), do: <<>>
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line
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def filter_digits2(<<x, rest::binary>>) when x in ?1..?9, do: <<x>> <> filter_digits2(rest)
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|> String.replace("one", "o1e")
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def filter_digits2(<<"one", rest::binary>>), do: "1" <> filter_digits2("e" <> rest)
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|> String.replace("two", "t2o")
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def filter_digits2(<<"two", rest::binary>>), do: "2" <> filter_digits2("o" <> rest)
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|> String.replace("three", "t3e")
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def filter_digits2(<<"three", rest::binary>>), do: "3" <> filter_digits2("e" <> rest)
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|> String.replace("four", "f4r")
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def filter_digits2(<<"four", rest::binary>>), do: "4" <> filter_digits2("r" <> rest)
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|> String.replace("five", "f5e")
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def filter_digits2(<<"five", rest::binary>>), do: "5" <> filter_digits2("e" <> rest)
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|> String.replace("six", "s6x")
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def filter_digits2(<<"six", rest::binary>>), do: "6" <> filter_digits2("x" <> rest)
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|> String.replace("seven", "s7n")
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def filter_digits2(<<"seven", rest::binary>>), do: "7" <> filter_digits2("n" <> rest)
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|> String.replace("eight", "e8t")
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def filter_digits2(<<"eight", rest::binary>>), do: "8" <> filter_digits2("t" <> rest)
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|> String.replace("nine", "n9e")
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def filter_digits2(<<"nine", rest::binary>>), do: "9" <> filter_digits2("e" <> rest)
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end
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def filter_digits2(<<_, rest::binary>>), do: filter_digits2(rest)
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def input do
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def input do
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with [input_filename] <- System.argv(),
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with [input_filename] <- System.argv(),
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