diff --git a/2018/elixir/.formatter.exs b/2018/elixir/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/2018/elixir/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/2018/elixir/.gitignore b/2018/elixir/.gitignore
new file mode 100644
index 0000000..1144eae
--- /dev/null
+++ b/2018/elixir/.gitignore
@@ -0,0 +1,26 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where 3rd-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+advent_of_code_2018-*.tar
+
+# Ignore language server files
+/.elixir_ls
diff --git a/2018/elixir/README.md b/2018/elixir/README.md
new file mode 100644
index 0000000..35fc641
--- /dev/null
+++ b/2018/elixir/README.md
@@ -0,0 +1,14 @@
+# Advent of Code 2018
+
+Herein lies my Elixir solutions for the Advent of Code 2018 puzzles.
+
+## Approach
+
+My approach to each problem involves the following procedure:
+
+1. Write an initial solution for each puzzle with no help beyond code
+	 documentation.
+2. Rewrite initial solutions to improve the code's readability and performance.
+3. Watch José Valim (the author of Elixir) solve the solutions.
+4. Refactor again, keeping the core of my solution intact (unless truly awful),
+	 but applying anything interesting learned from his solution.
diff --git a/2018/elixir/config/config.exs b/2018/elixir/config/config.exs
new file mode 100644
index 0000000..db5cebb
--- /dev/null
+++ b/2018/elixir/config/config.exs
@@ -0,0 +1,30 @@
+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# 3rd-party users, it should be done in your "mix.exs" file.
+
+# You can configure your application as:
+#
+#     config :advent_of_code_2018, key: :value
+#
+# and access this configuration in your application as:
+#
+#     Application.get_env(:advent_of_code_2018, :key)
+#
+# You can also configure a 3rd-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env()}.exs"
diff --git a/2018/elixir/inputs/one.txt b/2018/elixir/inputs/one.txt
new file mode 100644
index 0000000..fdbf689
--- /dev/null
+++ b/2018/elixir/inputs/one.txt
@@ -0,0 +1,1017 @@
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diff --git a/2018/elixir/inputs/three.txt b/2018/elixir/inputs/three.txt
new file mode 100644
index 0000000..b065622
--- /dev/null
+++ b/2018/elixir/inputs/three.txt
@@ -0,0 +1,1341 @@
+#1 @ 604,100: 17x27
+#2 @ 861,26: 23x24
+#3 @ 875,844: 29x20
+#4 @ 524,114: 24x24
+#5 @ 696,820: 26x19
+#6 @ 746,795: 19x14
+#7 @ 48,965: 24x29
+#8 @ 798,18: 27x18
+#9 @ 296,182: 17x13
+#10 @ 189,299: 27x16
+#11 @ 416,282: 13x16
+#12 @ 428,975: 13x15
+#13 @ 16,803: 20x25
+#14 @ 432,825: 12x18
+#15 @ 974,894: 22x12
+#16 @ 312,37: 27x12
+#17 @ 117,474: 17x24
+#18 @ 319,163: 25x18
+#19 @ 593,759: 15x21
+#20 @ 725,551: 22x18
+#21 @ 278,959: 18x20
+#22 @ 178,871: 24x29
+#23 @ 143,688: 25x24
+#24 @ 803,5: 17x16
+#25 @ 67,101: 12x12
+#26 @ 447,582: 10x29
+#27 @ 272,338: 18x27
+#28 @ 186,424: 12x12
+#29 @ 978,202: 11x11
+#30 @ 421,583: 18x19
+#31 @ 181,11: 21x20
+#32 @ 832,872: 25x23
+#33 @ 907,285: 22x17
+#34 @ 439,398: 13x25
+#35 @ 81,266: 26x10
+#36 @ 229,594: 18x20
+#37 @ 628,101: 11x11
+#38 @ 973,947: 25x16
+#39 @ 701,114: 13x11
+#40 @ 367,290: 19x29
+#41 @ 165,239: 28x26
+#42 @ 498,773: 7x14
+#43 @ 539,54: 11x16
+#44 @ 119,477: 9x3
+#45 @ 401,630: 24x17
+#46 @ 511,866: 22x14
+#47 @ 469,329: 11x24
+#48 @ 293,33: 11x14
+#49 @ 5,782: 24x16
+#50 @ 868,769: 21x21
+#51 @ 655,420: 22x25
+#52 @ 871,498: 4x3
+#53 @ 479,329: 21x26
+#54 @ 640,354: 26x16
+#55 @ 604,742: 27x28
+#56 @ 258,423: 12x25
+#57 @ 874,211: 23x20
+#58 @ 788,123: 23x18
+#59 @ 822,438: 13x12
+#60 @ 944,792: 21x18
+#61 @ 48,512: 22x20
+#62 @ 689,639: 26x10
+#63 @ 838,270: 21x15
+#64 @ 273,359: 25x26
+#65 @ 857,606: 18x22
+#66 @ 847,939: 15x26
+#67 @ 740,924: 23x26
+#68 @ 2,498: 11x18
+#69 @ 255,698: 15x28
+#70 @ 354,97: 24x28
+#71 @ 586,516: 16x26
+#72 @ 26,157: 24x25
+#73 @ 204,435: 24x23
+#74 @ 734,715: 28x28
+#75 @ 211,228: 17x14
+#76 @ 161,903: 21x15
+#77 @ 343,675: 17x26
+#78 @ 686,600: 29x27
+#79 @ 209,583: 27x22
+#80 @ 573,925: 29x15
+#81 @ 254,257: 27x18
+#82 @ 204,93: 15x18
+#83 @ 238,607: 12x13
+#84 @ 938,256: 29x13
+#85 @ 575,927: 17x9
+#86 @ 102,381: 21x21
+#87 @ 319,854: 20x17
+#88 @ 672,457: 26x10
+#89 @ 617,526: 26x28
+#90 @ 661,865: 18x23
+#91 @ 390,123: 20x13
+#92 @ 651,46: 17x15
+#93 @ 670,798: 20x19
+#94 @ 459,711: 13x10
+#95 @ 149,107: 16x18
+#96 @ 454,640: 22x24
+#97 @ 35,202: 14x28
+#98 @ 477,537: 23x28
+#99 @ 27,242: 13x20
+#100 @ 689,111: 26x28
+#101 @ 827,949: 18x20
+#102 @ 220,413: 19x18
+#103 @ 708,858: 18x17
+#104 @ 108,903: 18x19
+#105 @ 716,51: 10x19
+#106 @ 162,31: 13x24
+#107 @ 159,893: 27x10
+#108 @ 590,199: 11x5
+#109 @ 599,452: 29x27
+#110 @ 596,453: 16x28
+#111 @ 211,184: 19x13
+#112 @ 952,350: 26x16
+#113 @ 300,92: 11x20
+#114 @ 488,611: 21x13
+#115 @ 4,421: 11x26
+#116 @ 475,454: 29x13
+#117 @ 656,330: 20x17
+#118 @ 937,351: 27x27
+#119 @ 17,526: 28x27
+#120 @ 222,633: 12x17
+#121 @ 132,820: 28x19
+#122 @ 184,278: 14x18
+#123 @ 781,75: 23x15
+#124 @ 787,64: 16x22
+#125 @ 617,193: 14x15
+#126 @ 478,17: 20x27
+#127 @ 339,325: 27x22
+#128 @ 305,686: 29x18
+#129 @ 496,810: 25x25
+#130 @ 745,790: 24x23
+#131 @ 258,651: 20x24
+#132 @ 334,34: 17x11
+#133 @ 173,316: 22x19
+#134 @ 113,816: 28x15
+#135 @ 907,809: 20x14
+#136 @ 38,102: 25x27
+#137 @ 207,212: 12x22
+#138 @ 705,871: 21x15
+#139 @ 722,819: 23x25
+#140 @ 56,466: 24x26
+#141 @ 60,126: 25x13
+#142 @ 161,22: 15x18
+#143 @ 3,857: 21x17
+#144 @ 438,62: 9x9
+#145 @ 246,831: 24x11
+#146 @ 190,569: 27x21
+#147 @ 384,143: 19x27
+#148 @ 293,864: 13x26
+#149 @ 737,480: 18x15
+#150 @ 962,808: 24x24
+#151 @ 646,932: 26x24
+#152 @ 259,151: 16x22
+#153 @ 584,56: 3x14
+#154 @ 929,181: 10x18
+#155 @ 795,846: 15x26
+#156 @ 699,242: 27x24
+#157 @ 520,969: 27x18
+#158 @ 870,195: 10x29
+#159 @ 645,783: 27x14
+#160 @ 393,742: 23x20
+#161 @ 17,475: 28x22
+#162 @ 797,834: 18x10
+#163 @ 526,446: 19x16
+#164 @ 434,729: 20x17
+#165 @ 169,509: 20x18
+#166 @ 97,519: 24x22
+#167 @ 901,191: 17x22
+#168 @ 858,49: 13x26
+#169 @ 815,516: 18x18
+#170 @ 732,354: 12x22
+#171 @ 165,407: 20x19
+#172 @ 651,826: 22x26
+#173 @ 811,585: 14x23
+#174 @ 297,211: 28x17
+#175 @ 878,721: 24x18
+#176 @ 328,774: 17x23
+#177 @ 972,62: 20x20
+#178 @ 367,972: 28x16
+#179 @ 534,847: 11x21
+#180 @ 390,848: 26x15
+#181 @ 459,655: 18x23
+#182 @ 297,410: 29x14
+#183 @ 147,324: 12x17
+#184 @ 655,775: 17x23
+#185 @ 807,943: 28x18
+#186 @ 632,512: 18x23
+#187 @ 593,634: 15x13
+#188 @ 397,394: 20x26
+#189 @ 694,218: 29x12
+#190 @ 272,873: 21x22
+#191 @ 148,437: 20x24
+#192 @ 542,878: 22x25
+#193 @ 867,480: 16x24
+#194 @ 565,127: 17x24
+#195 @ 306,69: 23x25
+#196 @ 856,488: 23x27
+#197 @ 905,883: 13x29
+#198 @ 116,237: 25x29
+#199 @ 798,129: 20x23
+#200 @ 422,562: 16x22
+#201 @ 274,656: 17x12
+#202 @ 449,369: 25x11
+#203 @ 394,596: 25x14
+#204 @ 888,108: 22x27
+#205 @ 783,867: 29x16
+#206 @ 571,831: 21x17
+#207 @ 672,478: 27x17
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diff --git a/2018/elixir/inputs/two.txt b/2018/elixir/inputs/two.txt
new file mode 100644
index 0000000..6f2da1d
--- /dev/null
+++ b/2018/elixir/inputs/two.txt
@@ -0,0 +1,250 @@
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diff --git a/2018/elixir/lib/advent_of_code_2018.ex b/2018/elixir/lib/advent_of_code_2018.ex
new file mode 100644
index 0000000..a209525
--- /dev/null
+++ b/2018/elixir/lib/advent_of_code_2018.ex
@@ -0,0 +1,18 @@
+defmodule AdventOfCode2018 do
+  @moduledoc """
+  Documentation for AdventOfCode2018.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> AdventOfCode2018.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end
diff --git a/2018/elixir/lib/one.ex b/2018/elixir/lib/one.ex
new file mode 100644
index 0000000..8cbc9ae
--- /dev/null
+++ b/2018/elixir/lib/one.ex
@@ -0,0 +1,16 @@
+defmodule One do
+  def part1(list, initial_freq \\ 0), do: initial_freq + Enum.sum(list)
+
+  def part2(list, initial_freq \\ 0) do
+    list
+    |> Stream.cycle()
+    |> Enum.reduce_while({initial_freq, MapSet.new([initial_freq])}, &part2_reducer/2)
+  end
+
+  def part2_reducer(i, {last, set}) do
+    case (i + last) in set do
+      true -> {:halt, i + last}
+      _ -> {:cont, {i + last, MapSet.put(set, i + last)}}
+    end
+  end
+end
diff --git a/2018/elixir/lib/three.ex b/2018/elixir/lib/three.ex
new file mode 100644
index 0000000..4f80785
--- /dev/null
+++ b/2018/elixir/lib/three.ex
@@ -0,0 +1,73 @@
+defmodule Three do
+  @dimension_parser ~r/\#(\d+)\s@\s(\d+),(\d+):\s(\d+)x(\d+)/
+
+  def part1(input_stream) do
+    input_stream
+    |> Stream.map(&parse_dimensions/1)
+    |> Stream.map(&points_in_square/1)
+    |> Enum.to_list()
+    |> Enum.reduce({MapSet.new([]), MapSet.new([])}, &intersecting_squares/2)
+    |> elem(1)
+    |> MapSet.to_list()
+    |> length()
+  end
+
+  def parse_dimensions(str) do
+    l = Regex.run(@dimension_parser, str)
+    [id, x, y, w, h] = l |> tl() |> Enum.map(&String.to_integer/1)
+    {id, x, y, w, h}
+  end
+
+  def points_in_square({_, x, y, w, h}) do
+    x..(x + w - 1)
+    |> Enum.reduce([], fn x, x_set ->
+      y..(y + h - 1)
+      |> Enum.reduce(x_set, fn y, xy_set ->
+        [{x, y} | xy_set]
+      end)
+    end)
+  end
+
+  def intersecting_squares(square_set, {set, intersects}) do
+    square_set
+    |> Enum.reduce({set, intersects}, fn pos, {set, intersects} ->
+      case MapSet.member?(set, pos) do
+        true -> {set, MapSet.put(intersects, pos)}
+        _ -> {MapSet.put(set, pos), intersects}
+      end
+    end)
+  end
+
+  def intersecting_squares2({id, square_set}, {set, intersects}) do
+    square_set
+    |> Enum.reduce({set, intersects}, fn pos, {set, intersects} ->
+      case MapSet.member?(set, pos) do
+        true -> {set, MapSet.put(intersects, pos)}
+        _ -> {MapSet.put(set, pos), intersects}
+      end
+    end)
+  end
+
+  # parse input lines
+  # for each set of dimensions, check each point in the square
+  #   if the point has been recorded already, remove both ids from the set
+
+  def part2(input_stream) do
+    square_data =
+      input_stream
+      |> Stream.map(&parse_dimensions/1)
+
+    square_id_set =
+      square_data
+      |> Stream.map(&elem(&1, 0))
+      |> Enum.to_list()
+      |> MapSet.new()
+
+    square_data
+    |> Enum.map(&{elem(&1, 0), points_in_square(&1)})
+    |> Enum.reduce({MapSet.new([]), square_id_set}, fn {id, points}, acc -> intersecting_squares2({id, points}, ))
+    |> elem(1)
+    |> MapSet.to_list()
+    |> length()
+  end
+end
diff --git a/2018/elixir/lib/two.ex b/2018/elixir/lib/two.ex
new file mode 100644
index 0000000..1be0dde
--- /dev/null
+++ b/2018/elixir/lib/two.ex
@@ -0,0 +1,40 @@
+defmodule Two do
+  def bool_int(true), do: 1
+  def bool_int(false), do: 0
+
+  def part1(id_list) do
+    id_list
+    |> Stream.map(fn id ->
+      id
+      |> String.codepoints()
+      |> Enum.reduce(%{}, fn l, acc -> Map.update(acc, l, 1, &(&1 + 1)) end)
+      |> Map.values()
+      |> MapSet.new()
+    end)
+    |> Enum.to_list()
+    |> Enum.reduce([0, 0], fn s, [x, y] ->
+      [x + bool_int(2 in s), y + bool_int(3 in s)]
+    end)
+    |> Enum.reduce(1, fn i, a -> a * i end)
+  end
+
+  def part2(id_list) do
+    id_list
+    |> Stream.map(&String.trim_trailing/1)
+    |> Enum.to_list()
+    |> permute_all_pairs()
+    |> List.flatten()
+    |> Enum.reduce_while("", fn {id1, id2}, _ ->
+      case String.myers_difference(id1, id2) do
+        [eq: p1, del: <<_x::size(8)>>, ins: <<_y::size(8)>>, eq: p2] -> {:halt, p1 <> p2}
+        _ -> {:cont, ""}
+      end
+    end)
+  end
+
+  def permute_all_pairs([]), do: []
+  def permute_all_pairs(list), do: [permute_pairs(list) | permute_all_pairs(tl(list))]
+
+  def permute_pairs([]), do: []
+  def permute_pairs([cur | rest]), do: Enum.map(rest, &{cur, &1})
+end
diff --git a/2018/elixir/mix.exs b/2018/elixir/mix.exs
new file mode 100644
index 0000000..65d7630
--- /dev/null
+++ b/2018/elixir/mix.exs
@@ -0,0 +1,28 @@
+defmodule AdventOfCode2018.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :advent_of_code_2018,
+      version: "0.1.0",
+      elixir: "~> 1.7",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"},
+    ]
+  end
+end
diff --git a/2018/elixir/test/advent_of_code_2018_test.exs b/2018/elixir/test/advent_of_code_2018_test.exs
new file mode 100644
index 0000000..915123b
--- /dev/null
+++ b/2018/elixir/test/advent_of_code_2018_test.exs
@@ -0,0 +1,41 @@
+defmodule AdventOfCode2018Test do
+  use ExUnit.Case, async: true
+
+  @doc "https://adventofcode.com/2018/day/1"
+  test "Day 1" do
+    input_stream =
+      File.stream!("./inputs/one.txt", [:read])
+      |> Stream.map(&String.trim_trailing/1)
+      |> Stream.map(&String.to_integer/1)
+
+    assert One.part1(input_stream) == 416
+    assert One.part2(input_stream) == 56752
+  end
+
+  @doc "https://adventofcode.com/2018/day/2"
+  test "Day 2" do
+    input_stream = File.stream!("./inputs/two.txt", [:read])
+
+    assert Two.part1(input_stream) == 6696
+    assert Two.part2(input_stream) == "bvnfawcnyoeyudzrpgslimtkj"
+  end
+
+  @tag :current_day
+  @doc "https://adventofcode.com/2018/day/3"
+  test "Day 3" do
+    test_input =
+      """
+      #1 @ 1,3: 4x4
+      #2 @ 3,1: 4x4
+      #3 @ 5,5: 2x2
+      """
+      |> String.split("\n", trim: true)
+
+    # expected_result = MapSet.new([{4, 4}, {5, 4}, {4, 5}, {5, 5}])
+    expected_result_part1 = 4
+    expected_result_part2 = 3
+
+    assert Three.part1(test_input) == expected_result_part1
+    assert Three.part2(test_input) == expected_result_part2
+  end
+end
diff --git a/2018/elixir/test/test_helper.exs b/2018/elixir/test/test_helper.exs
new file mode 100644
index 0000000..869559e
--- /dev/null
+++ b/2018/elixir/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()
diff --git a/2019/1.moon b/2019/1.moon
index 62309dd..ca5684a 100644
--- a/2019/1.moon
+++ b/2019/1.moon
@@ -1,6 +1,7 @@
 -- https://adventofcode.com/2019/day/1
 
 require "common"
+
 input = -> input_for_day(1)\gmatch "%d+"
 
 mass_to_fuel = => -2 + math.floor @ / 3
diff --git a/2019/common.moon b/2019/common.moon
index 53fee49..76b472e 100644
--- a/2019/common.moon
+++ b/2019/common.moon
@@ -9,8 +9,8 @@ read_whole_file = =>
 input_for_day = =>
 		read_whole_file "input/#{@}.txt"
 
-reduce = (iterable, initial, f) ->
+reduce = (initial, f) =>
 	acc = initial
-	for e in iterable
+	for e in @
 		acc = f acc, e
 	acc