AdventOfCode/day6/day6part2.exs

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Elixir
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defmodule Day6Part2 do
def run do
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File.stream!("input")
|> Stream.chunk_by(&(&1 == "\n"))
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|> Stream.map(fn group ->
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{count, frequencies} =
group
|> Enum.join()
|> String.to_charlist()
|> Enum.frequencies()
|> Map.pop(?\n)
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Enum.count(frequencies, fn {_, v} -> v == count end)
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end)
|> Enum.sum()
|> IO.puts()
end
end
Day6Part2.run()