day 2
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defmodule Day2 do
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def get_lines() do
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File.stream!("day2.in")
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|> Stream.map(&String.trim/1)
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end
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def find_subcount(count) do
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get_lines()
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|> Enum.reduce(0, fn x, acc ->
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if x
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|> String.graphemes()
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|> Enum.sort()
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|> Enum.uniq()
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|> Enum.any?(fn y ->
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Enum.count(String.graphemes(x), &(&1 == y)) == count
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end) do
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acc + 1
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else
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acc
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end
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end)
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end
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def find_common_chars() do
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get_lines()
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|> Enum.reduce(%MapSet{}, fn x, acc ->
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x
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|> String.graphemes()
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|> Enum.with_index()
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|> Enum.reduce(acc, fn {_c, i}, seen ->
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pair = {i, String.slice(x, 0, i) <> String.slice(x, (i + 1)..-1)}
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if MapSet.member?(seen, pair), do: IO.puts(elem(pair, 1))
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MapSet.put(seen, pair)
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end)
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end)
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end
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end
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IO.puts(Day2.find_subcount(2) * Day2.find_subcount(3))
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Day2.find_common_chars()
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