From 3ecbb09a51918f53c931f9ca42efd7acf74ee2f7 Mon Sep 17 00:00:00 2001
From: Doruk Gurleyen <doruk.gurleyen@divvypay.com>
Date: Wed, 1 Dec 2021 23:35:28 -0600
Subject: [PATCH] 2021.02

---
 challenges/2021/02.exs        |   21 +-
 challenges/2021/inputs/02.txt | 1000 +++++++++++++++++++++++++++++++++
 2 files changed, 1012 insertions(+), 9 deletions(-)

diff --git a/challenges/2021/02.exs b/challenges/2021/02.exs
index dd3152c..6adeec0 100644
--- a/challenges/2021/02.exs
+++ b/challenges/2021/02.exs
@@ -3,17 +3,20 @@ Code.compile_file(Path.join([__ENV__.file], ["../../../utils/utils.exs"]))
 defmodule Challenge do
   @moduledoc false
 
-  def input do
-    Utils.load_input(__ENV__.file)
-  end
+  def first_result(input), do: input |> Enum.reduce([0, 0], &exec_q1(&1, &2)) |> depth_x_pos()
+  def second_result(input), do: input |> Enum.reduce([0, 0, 0], &exec_q2(&1, &2)) |> depth_x_pos()
 
-  def first_result(input) do
-    input
-  end
+  defp exec_q1("forward " <> x, [pos, depth]), do: [pos + int(x), depth]
+  defp exec_q1("down " <> x, [pos, depth]), do: [pos, depth + int(x)]
+  defp exec_q1("up " <> x, [pos, depth]), do: [pos, depth - int(x)]
 
-  def second_result(input) do
-    input
-  end
+  defp exec_q2("forward " <> x, [pos, depth, aim]), do: [pos + int(x), depth + aim * int(x), aim]
+  defp exec_q2("down " <> x, [pos, depth, aim]), do: [pos, depth, aim + int(x)]
+  defp exec_q2("up " <> x, [pos, depth, aim]), do: [pos, depth, aim - int(x)]
+
+  defp int(str), do: String.to_integer(str)
+  defp depth_x_pos([x, y]), do: x * y
+  defp depth_x_pos([x, y, _]), do: x * y
 end
 
 Utils.run(&Challenge.first_result/1, __ENV__.file, "Q1")
diff --git a/challenges/2021/inputs/02.txt b/challenges/2021/inputs/02.txt
index e69de29..6669386 100644
--- a/challenges/2021/inputs/02.txt
+++ b/challenges/2021/inputs/02.txt
@@ -0,0 +1,1000 @@
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\ No newline at end of file