2021-05-13 13:05:13 +00:00
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list = File.read!("input.txt")
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2021-05-14 08:53:06 +00:00
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|> String.split(~r/\R/)
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2021-05-13 13:05:13 +00:00
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|> Enum.map(&String.to_integer/1)
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ans1 = list
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|> Enum.sum()
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IO.puts(ans1)
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2021-05-14 08:53:06 +00:00
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reducer = fn i, {current, seen} ->
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frequency = current + i
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2021-05-13 13:05:13 +00:00
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if MapSet.member?(seen, frequency) do
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{:halt, frequency}
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else
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{:cont, {frequency, MapSet.put(seen, frequency)}}
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end
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end
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ans2 = list
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|> Stream.cycle()
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|> Enum.reduce_while({0, MapSet.new([0])}, reducer)
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IO.puts(ans2)
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