Day 1: Historian Hysteria
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FAQ
- What is this?: Here is a post with a large amount of details: https://programming.dev/post/22323136
- Where do I participate?: https://adventofcode.com/
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*
Elixir
Total noob, but it’s fun to learn.
{left, right} =
File.read!("./input.txt")
|> String.split("\n", trim: true)
|> Enum.map(fn line ->
String.split(line)
|> Enum.map(&String.to_integer/1)
|> List.to_tuple()
end)
|> Enum.unzip()
|> then(fn {left, right} ->
{Enum.sort(left), Enum.sort(right)}
end)
diffs =
Enum.zip(left, right)
|> Enum.map(fn {l, r} -> abs(l - r) end)
|> Enum.sum()
freqs =
Enum.filter(right, fn r -> r in left end)
|> Enum.frequencies()
freqsum =
Enum.map(left, fn n ->
freq = Map.get(freqs, n, 0)
n * freq
end)
|> Enum.sum()
IO.puts("part 1: #{diffs}")
IO.puts("part 2: #{freqsum}")