37 lines
1.1 KiB
Elixir
37 lines
1.1 KiB
Elixir
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defmodule Day1 do
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def part1(file_path) do
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file_path
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|> File.read!()
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|> String.split("\n")
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|> Enum.map(&String.split/1)
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|> Enum.filter(fn list -> length(list) == 2 end)
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|> Enum.map(fn [a, b] -> {String.to_integer(a), String.to_integer(b)} end)
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|> Enum.unzip()
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|> Tuple.to_list()
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|> Enum.map(&Enum.sort/1)
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|> Enum.zip()
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|> Enum.map(fn {a, b} -> abs(a - b) end)
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|> Enum.sum()
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end
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def part2(file_path) do
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file_path
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|> File.read!()
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|> String.split("\n")
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|> Enum.map(&String.split/1)
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|> Enum.filter(fn list -> length(list) == 2 end)
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|> Enum.map(fn [a, b] -> {String.to_integer(a), String.to_integer(b)} end)
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|> Enum.unzip()
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|> Tuple.to_list()
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|> Enum.map(&Enum.sort/1)
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|> (fn [list1, list2] -> {list1, Enum.frequencies(list2)} end).()
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|> (fn {list1, freqs} ->
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list1
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|> Enum.map(&{&1, Map.get(freqs, &1, 0)})
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|> Enum.filter(fn {_, count} -> count != 0 end)
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|> Enum.map(fn {value, count} -> value * count end)
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end).()
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|> Enum.sum()
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end
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end
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