adamu
Advent Of Code 2022 - Day 3
Probably not the most efficient implementation, because part 1 took >1 ms and part 2 >4ms, but the code was simple enough.
def part1(input) do
input
# ...
|> Enum.map(fn {a, b} -> hd(a -- a -- b) end)
|> Enum.map(&score/1)
|> Enum.sum()
end
defp score(<<lower::utf8>>) when lower in ?a..?z, do: lower - ?a + 1
defp score(<<upper::utf8>>) when upper in ?A..?Z, do: upper - ?A + 27
https://git.adamu.jp/adam/AdventOfCode/src/branch/main/2022/day3.exs
Most Liked
mudasobwa
Creator of Cure
I went with charlists and MapSets.
...
|> Enum.map(&to_charlist/1)
|> Enum.map(&MapSet.new/1)
|> Enum.reduce(&MapSet.intersection/2)
...
4
mcrumm
Phoenix Core Team
I started with a MapSet but ended up with a :binary.match/2:
# split the rucksack into two equal compartments
{head, tail} = line |> String.split_at(line |> String.length() |> div(2))
head
|> String.codepoints()
|> Enum.reduce_while(:ok, fn code, _ ->
case :binary.match(tail, code) do
{_, 1} -> {:halt, code |> priority()}
:nomatch -> {:cont, :ok}
end
end)
https://github.com/mcrumm/aoc2022/blob/main/aoc2022-03.livemd
4
mcrumm
Phoenix Core Team
Thanks! I made a thing in case anyone else wants to use it:
https://github.com/mcrumm/req_aoc
Mix.install([
{:req_aoc, github: "mcrumm/req_aoc", ref: "28e3813"}
])
ReqAOC.fetch!({2022, 03, System.fetch_env!("LB_AOC_SESSION")})
# ==> "..."
4
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