diff --git a/23/elixir/inputs/day12.txt b/23/elixir/inputs/day12.txt
new file mode 100644
index 0000000..4c0a08d
--- /dev/null
+++ b/23/elixir/inputs/day12.txt
@@ -0,0 +1,1000 @@
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+?#.???.?#??#????? 1,1,2,7
+.???#.?#?.? 1,2
+#?#?#???????.? 3,8
+?.#????????.?.??.#. 1,7,1,1,1
+???????#????.?#. 10,2
+??.?????#? 1,5
diff --git a/23/elixir/inputs/day12_example.txt b/23/elixir/inputs/day12_example.txt
new file mode 100644
index 0000000..e925935
--- /dev/null
+++ b/23/elixir/inputs/day12_example.txt
@@ -0,0 +1,6 @@
+???.### 1,1,3
+.??..??...?##. 1,1,3
+?#?#?#?#?#?#?#? 1,3,1,6
+????.#...#... 4,1,1
+????.######..#####. 1,6,5
+?###???????? 3,2,1
diff --git a/23/elixir/inputs/day18.txt b/23/elixir/inputs/day18.txt
new file mode 100644
index 0000000..395f0df
--- /dev/null
+++ b/23/elixir/inputs/day18.txt
@@ -0,0 +1,618 @@
+L 4 (#6c74e0)
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+D 18 (#3533c1)
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+D 17 (#35b073)
+R 7 (#0c5930)
+D 5 (#400163)
+L 9 (#2a1ab2)
+D 11 (#3bc7a3)
+L 14 (#269eb2)
+D 9 (#1ef343)
+L 10 (#269eb0)
+U 4 (#2d4f23)
+R 6 (#38f922)
+U 9 (#5a3f31)
+L 3 (#1269d2)
+U 8 (#2dcad1)
+L 7 (#2296c2)
+U 9 (#3b97a3)
+R 10 (#24c7b2)
+U 3 (#67d443)
+L 6 (#39a682)
+U 8 (#1c8c93)
+L 6 (#75d832)
+U 3 (#11b393)
+L 3 (#441282)
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+L 11 (#385732)
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diff --git a/23/elixir/inputs/day18_example.txt b/23/elixir/inputs/day18_example.txt
new file mode 100644
index 0000000..fc7612e
--- /dev/null
+++ b/23/elixir/inputs/day18_example.txt
@@ -0,0 +1,14 @@
+R 6 (#70c710)
+D 5 (#0dc571)
+L 2 (#5713f0)
+D 2 (#d2c081)
+R 2 (#59c680)
+D 2 (#411b91)
+L 5 (#8ceee2)
+U 2 (#caa173)
+L 1 (#1b58a2)
+U 2 (#caa171)
+R 2 (#7807d2)
+U 3 (#a77fa3)
+L 2 (#015232)
+U 2 (#7a21e3)
diff --git a/23/elixir/lib/days/day12.ex b/23/elixir/lib/days/day12.ex
new file mode 100644
index 0000000..35a649d
--- /dev/null
+++ b/23/elixir/lib/days/day12.ex
@@ -0,0 +1,103 @@
+defmodule AOC.Day12 do
+  use AOC.Day, day: 12, input: "example"
+  # use AOC.Day, day: 12
+
+  def parse_input(lines) do
+    Enum.map(lines, fn line ->
+      [conditions, groups] = String.split(line, " ")
+      conditions = String.to_charlist(conditions)
+
+      groups =
+        groups
+        |> String.split(",")
+        |> Enum.map(&String.to_integer/1)
+
+      {conditions, groups}
+    end)
+  end
+
+  def possible_unknown_spring_conditions(unknown_spring_count) when unknown_spring_count == 0,
+    do: [[]]
+
+  def possible_unknown_spring_conditions(unknown_spring_count) do
+    next_list = possible_unknown_spring_conditions(unknown_spring_count - 1)
+    Enum.map(next_list, &[true | &1]) ++ Enum.map(next_list, &[false | &1])
+  end
+
+  def apply_spring_configuration([], []), do: []
+
+  def apply_spring_configuration([?. | conditions], spring_configuration) do
+    [?. | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def apply_spring_configuration([?# | conditions], spring_configuration) do
+    [?# | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def apply_spring_configuration([?? | conditions], [true | spring_configuration]) do
+    [?. | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def apply_spring_configuration([?? | conditions], [false | spring_configuration]) do
+    [?# | apply_spring_configuration(conditions, spring_configuration)]
+  end
+
+  def valid_spring_conditions?(conditions, []) do
+    not Enum.member?(conditions, ?#)
+  end
+
+  def valid_spring_conditions?([?. | conditions], groups) do
+    valid_spring_conditions?(conditions, groups)
+  end
+
+  def valid_spring_conditions?(conditions, [count | groups]) do
+    {left, right} = Enum.split(conditions, count)
+
+    length(left) == count and Enum.all?(left, &(&1 == ?#)) and
+      (length(right) == 0 or hd(right) == ?.) and valid_spring_conditions?(right, groups)
+  end
+
+  def generate_arrangements(conditions, groups) do
+    unknown_spring_count = Enum.count(conditions, &(&1 == ??))
+
+    possible_unknown_spring_conditions(unknown_spring_count)
+    |> Stream.map(fn spring_configuration ->
+      apply_spring_configuration(conditions, spring_configuration)
+    end)
+    |> Stream.filter(fn possible_conditions ->
+      valid_spring_conditions?(possible_conditions, groups)
+    end)
+
+    # |> Enum.to_list()
+  end
+
+  def calculate_arrangement_counts(input, duplicates \\ 1) do
+    input
+    |> Enum.map(fn {conditions, groups} ->
+      conditions =
+        conditions
+        |> List.duplicate(duplicates)
+        |> Enum.intersperse(~c"?")
+        |> List.flatten()
+
+      groups =
+        groups
+        |> List.duplicate(duplicates)
+        |> List.flatten()
+
+      generate_arrangements(conditions, groups)
+    end)
+    |> Enum.map(&Enum.count/1)
+    |> Enum.sum()
+  end
+
+  def part1(input) do
+    calculate_arrangement_counts(input)
+  end
+
+  def part2(input) do
+    calculate_arrangement_counts(input, 5)
+  end
+end
+
+# NOTE TO SELF: memoize the brute force...
diff --git a/23/elixir/lib/days/day18.ex b/23/elixir/lib/days/day18.ex
new file mode 100644
index 0000000..8499743
--- /dev/null
+++ b/23/elixir/lib/days/day18.ex
@@ -0,0 +1,110 @@
+defmodule AOC.Day18 do
+  # use AOC.Day, day: 18, input: "example"
+  use AOC.Day, day: 18
+
+  def parse_input(lines) do
+    Enum.map(lines, fn line ->
+      %{"direction" => direction, "length" => length, "color" => color} =
+        Regex.named_captures(
+          ~r/^(?<direction>[UDLR]) (?<length>\d+) \(\#(?<color>[[:alnum:]]+)\)$/,
+          line
+        )
+
+      {String.to_atom(direction), String.to_integer(length), color}
+    end)
+  end
+
+  def dig_stretch({y, x}, direction, length) do
+    Enum.map(1..length, fn n ->
+      case direction do
+        :U -> {y - n, x}
+        :R -> {y, x + n}
+        :D -> {y + n, x}
+        :L -> {y, x - n}
+      end
+    end)
+  end
+
+  def execute_dig_plan(dig_plan) do
+    Enum.reduce(dig_plan, {%{{0, 0} => true}, {0, 0}}, fn {direction, length, _color},
+                                                          {terrain, position} ->
+      stretch = dig_stretch(position, direction, length)
+
+      terrain =
+        Enum.reduce(stretch, terrain, fn new_position, acc ->
+          Map.put(acc, new_position, true)
+        end)
+
+      new_position = stretch |> Enum.reverse() |> hd()
+
+      {terrain, new_position}
+    end)
+  end
+
+  def print_terrain(terrain) do
+    max_y = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 0)) |> Enum.max()
+    max_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.max()
+    min_y = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 0)) |> Enum.min()
+    min_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.min()
+
+    Enum.each(min_y..max_y, fn y ->
+      Enum.map(min_x..max_x, fn x ->
+        case Map.fetch(terrain, {y, x}) do
+          :error -> "."
+          _ -> "#"
+        end
+      end)
+      |> Enum.join()
+      |> IO.puts()
+    end)
+  end
+
+  def find_interior_space(terrain) do
+    max_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.max()
+    min_x = terrain |> Enum.map(&elem(&1, 0)) |> Enum.map(&elem(&1, 1)) |> Enum.min()
+
+    edge_x =
+      Enum.find(min_x..max_x, fn x ->
+        case Map.fetch(terrain, {2, x}) do
+          :error -> false
+          _ -> true
+        end
+      end)
+
+    edge_x + 1
+  end
+
+  def flood_fill_terrain(terrain) do
+    interior_x = find_interior_space(terrain)
+
+    flood_fill_terrain(terrain, {1, interior_x})
+  end
+
+  def flood_fill_terrain(terrain, {y, x}) do
+    [{y - 1, x}, {y, x + 1}, {y + 1, x}, {y, x - 1}]
+    |> Enum.reduce(terrain, fn next_position, acc ->
+      case Map.fetch(acc, next_position) do
+        :error ->
+          acc
+          |> Map.put(next_position, true)
+          |> flood_fill_terrain(next_position)
+
+        _ ->
+          acc
+      end
+    end)
+  end
+
+  def part1(dig_plan) do
+    execute_dig_plan(dig_plan)
+    |> elem(0)
+    # |> tap(&print_terrain/1)
+    |> flood_fill_terrain()
+    # |> tap(&print_terrain/1)
+    |> Enum.count()
+  end
+
+  def part2(_input) do
+    "TODO"
+  end
+end