From 4458f8021de6133210a10d983751e4a88a9c1976 Mon Sep 17 00:00:00 2001
From: Shadowfacts <me@shadowfacts.net>
Date: Wed, 2 Dec 2020 09:34:12 -0500
Subject: [PATCH] Day 2

---
 lib/day2/day2.ex   |   56 +++
 lib/day2/input.txt | 1000 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 1056 insertions(+)
 create mode 100644 lib/day2/day2.ex
 create mode 100644 lib/day2/input.txt

diff --git a/lib/day2/day2.ex b/lib/day2/day2.ex
new file mode 100644
index 0000000..81e8066
--- /dev/null
+++ b/lib/day2/day2.ex
@@ -0,0 +1,56 @@
+defmodule Day2 do
+  @example """
+  1-3 a: abcde
+  1-3 b: cdefg
+  2-9 c: ccccccccc
+  """
+
+  def part1(example \\ false) do
+    if(example, do: @example, else: File.read!("lib/day2/input.txt"))
+    |> String.trim()
+    |> String.split("\n")
+    |> Enum.map(&parse_policy_and_password/1)
+    |> Enum.count(&password_valid1/1)
+  end
+
+  def part2(example \\ false) do
+    if(example, do: @example, else: File.read!("lib/day2/input.txt"))
+    |> String.trim()
+    |> String.split("\n")
+    |> Enum.map(&parse_policy_and_password/1)
+    |> Enum.count(&password_valid2/1)
+  end
+
+  def parse_policy_and_password(line) do
+    [policy, rest] = String.split(line, ":")
+    rest = String.trim(rest)
+
+    [count, letter] = String.split(policy, " ")
+    [min, max] = String.split(count, "-")
+    min = String.to_integer(min)
+    max = String.to_integer(max)
+
+    {{letter, min, max}, rest}
+  end
+
+  def password_valid1({{letter, min, max}, password}) do
+    letter_count =
+      password
+      |> String.codepoints()
+      |> Enum.count(fn
+        ^letter -> true
+        _ -> false
+      end)
+
+    letter_count >= min && letter_count <= max
+  end
+
+  def password_valid2({{letter, first, second}, password}) do
+    at_first = String.at(password, first - 1)
+    at_second = String.at(password, second - 1)
+    first_matches = letter == at_first
+    second_matches = letter == at_second
+
+    (first_matches || second_matches) && !(first_matches && second_matches)
+  end
+end
diff --git a/lib/day2/input.txt b/lib/day2/input.txt
new file mode 100644
index 0000000..bd40cc0
--- /dev/null
+++ b/lib/day2/input.txt
@@ -0,0 +1,1000 @@
+6-9 z: qzzzzxzzfzzzz
+2-4 s: xgmsdts
+6-7 k: khqpsvk
+1-3 k: knkqh
+4-11 z: lwnzgzlmpvz
+11-12 m: mmmmmmmmmmtz
+1-10 l: lllllllllml
+2-5 q: qjmzhdpmmnqpwptn
+7-8 t: ttkttbtwtt
+7-10 k: jmmlgrkmwkzkhbhr
+4-15 m: xrnxpvxsqfmfmtmqg
+5-7 s: swsskgwsbzv
+1-3 w: fqbnmlbvnw
+3-4 f: btqj
+1-6 l: llwlll
+14-19 s: ssnskstsssssssgcssq
+7-8 c: ccccccccccc
+3-6 p: fbzpfpp
+6-7 m: mmmmmmm
+4-7 b: tbdbgdmbbtbb
+5-6 z: zzxczzzmttpl
+12-13 c: fcjcbkcvqfpcj
+4-7 h: hhhhhshgjhrbmhh
+2-5 x: gxfdt
+7-15 c: czpmdcgzsclgfvnf
+4-7 s: djrssdsrxs
+3-18 k: bxnktckkrklkkqkbhkk
+4-6 d: ddddddds
+1-4 s: rssssss
+15-18 c: cccccccccccccccccc
+5-7 k: kkdkfqkkkc
+2-3 p: fppp
+3-4 n: qnnn
+11-12 r: crrgrrrmrrrrrnrnrgcr
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