AOC 2024

DayI.exs

# Part I

x
|> String.split()
|> Enum.map(&String.to_integer/1)
|> Enum.chunk_every(2)
|> Enum.map(&List.to_tuple/1)
|> Enum.unzip()
|> then(fn {lhs, rhs} ->
  lhs = Enum.sort(lhs)
  rhs = Enum.sort(rhs)
  [lhs, rhs]
end)
|> Enum.zip()
|> Enum.map(fn {l, r} -> abs(l - r) end)
|> Enum.sum()

# Part II

x
|> String.split()
|> Enum.map(&String.to_integer/1)
|> Enum.chunk_every(2)
|> Enum.map(&List.to_tuple/1)
|> Enum.unzip()
|> then(fn {lhs, rhs} ->
  for l <- lhs do
    l * Enum.count(rhs, &(&1 === l))
  end
end)
|> Enum.sum()