31 lines
750 B
Elixir
31 lines
750 B
Elixir
defmodule Part2 do
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def count_diffs(str1, str2) do
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Stream.zip(String.to_charlist(str1), String.to_charlist(str2))
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|> Enum.count(fn {a, b} -> a !== b end)
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end
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def common_chars(str1, str2) do
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Stream.zip(String.to_charlist(str1), String.to_charlist(str2))
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|> Stream.filter(fn {a, b} -> a === b end)
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|> Enum.map(fn {a, _b} -> a end)
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end
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def run do
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boxes = File.stream!("input") |> Enum.map(&String.trim/1)
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diffs =
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for box <- boxes, other_box <- boxes -- [box] do
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{box, count_diffs(box, other_box)}
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end
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[str1, str2] =
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diffs
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|> Enum.filter(fn {_box, diff} -> diff === 1 end)
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|> Enum.map(fn {box, 1} -> box end)
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IO.puts(common_chars(str1, str2))
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end
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end
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Part2.run()
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