From c8f40ccfe4d16e9323e9bf9473a42083b4b35fae Mon Sep 17 00:00:00 2001
From: Erwin Boskma <erwin@datarift.nl>
Date: Mon, 12 Dec 2022 20:49:39 +0100
Subject: [PATCH] Finished day 6

---
 README.org  |  4 +++
 day6.livemd | 86 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 90 insertions(+)
 create mode 100644 day6.livemd

diff --git a/README.org b/README.org
index 2a9d72e..71d401c 100644
--- a/README.org
+++ b/README.org
@@ -13,3 +13,7 @@ Day 3: [[https://livebook.dev/run?url=https%3A%2F%2Fgit.datarift.nl%2Ferwin%2Fao
 Day 4: [[https://livebook.dev/run?url=https%3A%2F%2Fgit.datarift.nl%2Ferwin%2Faoc2022%2Fraw%2Fbranch%2Fmain%2Fday4.livemd][Run in Livebook]]
 
 Day 5: [[https://livebook.dev/run?url=https%3A%2F%2Fgit.datarift.nl%2Ferwin%2Faoc2022%2Fraw%2Fbranch%2Fmain%2Fday5.livemd][Run in Livebook]]
+
+Day 6: [[https://livebook.dev/run?url=https%3A%2F%2Fgit.datarift.nl%2Ferwin%2Faoc2022%2Fraw%2Fbranch%2Fmain%2Fday6.livemd][Run in Livebook]]
+
+
diff --git a/day6.livemd b/day6.livemd
new file mode 100644
index 0000000..0b77080
--- /dev/null
+++ b/day6.livemd
@@ -0,0 +1,86 @@
+# AOC 2022 - Day 6
+
+```elixir
+Mix.install([
+  {:req, "~> 0.3.3"}
+])
+```
+
+## Puzzle description
+
+[Day 6: Tuning Trouble](https://adventofcode.com/2022/day/6).
+
+## Input
+
+```elixir
+defmodule Load do
+  def input do
+    aoc_session = System.fetch_env!("LB_AOC_SESSION")
+    input_url = "https://adventofcode.com/2022/day/6/input"
+    Req.get!(input_url, headers: [cookie: "session=#{aoc_session}"]).body
+  end
+end
+```
+
+## Solution
+
+```elixir
+defmodule Marker do
+  def find(input, marker_length) do
+    input
+    |> String.graphemes()
+    |> Enum.chunk_every(marker_length, 1)
+    |> Enum.map(&MapSet.new/1)
+    |> Enum.find_index(&(MapSet.size(&1) == marker_length))
+    |> Kernel.+(marker_length)
+  end
+end
+```
+
+```elixir
+defmodule Part1 do
+  @marker_length 4
+  def run(input) do
+    input
+    |> Marker.find(@marker_length)
+  end
+end
+
+defmodule Part2 do
+  @marker_length 14
+  def run(input) do
+    input
+    |> Marker.find(@marker_length)
+  end
+end
+
+ExUnit.start(autorun: false)
+
+defmodule Test do
+  use ExUnit.Case, async: true
+  @example_input ~s(mjqjpqmgbljsphdztnvjfqwrcgsmlb)
+  @input Load.input()
+
+  test "it loads the input" do
+    assert String.length(@input) > 0
+  end
+
+  test "part 1 example" do
+    assert Part1.run(@example_input) === 7
+  end
+
+  test "part 1" do
+    assert Part1.run(@input) === 1093
+  end
+
+  test "part 2 example" do
+    assert Part2.run(@example_input) === 19
+  end
+
+  test "part 2" do
+    assert Part2.run(@input) === 3534
+  end
+end
+
+ExUnit.run()
+```