AdventOfCode/2018/day2/part2.exs

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Elixir
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2021-12-26 13:10:19 +00:00
defmodule Part2 do
def count_diffs(str1, str2) do
Stream.zip(String.to_charlist(str1), String.to_charlist(str2))
|> Enum.count(fn {a, b} -> a !== b end)
end
def common_chars(str1, str2) do
Stream.zip(String.to_charlist(str1), String.to_charlist(str2))
|> Stream.filter(fn {a, b} -> a === b end)
|> Enum.map(fn {a, _b} -> a end)
end
def run do
boxes = File.stream!("input") |> Enum.map(&String.trim/1)
diffs =
for box <- boxes, other_box <- boxes -- [box] do
{box, count_diffs(box, other_box)}
end
[str1, str2] =
diffs
|> Enum.filter(fn {_box, diff} -> diff === 1 end)
|> Enum.map(fn {box, 1} -> box end)
IO.puts(common_chars(str1, str2))
end
end
Part2.run()