From 8ab65dc2da1742eb86ec636c50c7018385b68167 Mon Sep 17 00:00:00 2001 From: "J.J" Date: Thu, 30 Nov 2023 17:10:00 -0500 Subject: prep for 2023, renaming for consistency --- aoc2021/day-06/day-06.ex | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 aoc2021/day-06/day-06.ex (limited to 'aoc2021/day-06/day-06.ex') diff --git a/aoc2021/day-06/day-06.ex b/aoc2021/day-06/day-06.ex new file mode 100644 index 0000000..efe10e4 --- /dev/null +++ b/aoc2021/day-06/day-06.ex @@ -0,0 +1,35 @@ +defmodule Day06 do + def next_day(state) do + with one_day_older <- Enum.into(state, %{}, fn {k, v} -> {k - 1, v} end), + {n, s} <- Map.pop(one_day_older, -1, 0) do + Map.update(s, 6, n, &(&1 + n)) + |> Map.put(8, n) + end + end +end + +school = + with {:ok, data} <- File.read("input.txt") do + data + |> String.trim() + |> String.split(",") + |> Enum.map(&String.to_integer/1) + end + +starting_state = Enum.frequencies(school) + +Enum.reduce( + Enum.to_list(1..80), + starting_state, + fn _, acc -> Day06.next_day(acc) end +) +|> Enum.reduce(0, fn {_, v}, acc -> v + acc end) +|> IO.inspect() + +Enum.reduce( + Enum.to_list(1..256), + starting_state, + fn _, acc -> Day06.next_day(acc) end +) +|> Enum.reduce(0, fn {_, v}, acc -> v + acc end) +|> IO.inspect() -- cgit v1.2.3