From 4ed0766d6ec0c1b17a066f9ac6c2a8a03f7830af Mon Sep 17 00:00:00 2001
From: Ariejan de Vroom <ariejan@devroom.io>
Date: Sun, 1 Dec 2024 09:25:57 +0100
Subject: [PATCH] Day 1 puzzles 1+2

---
 lib/input/day_01.txt          | 1000 +++++++++++++++++++++++++++++++++
 lib/solutions/day_01.rb       |   42 ++
 spec/input/day_01_test.txt    |    6 +
 spec/solutions/day_01_spec.rb |   18 +
 4 files changed, 1066 insertions(+)
 create mode 100644 lib/input/day_01.txt
 create mode 100644 lib/solutions/day_01.rb
 create mode 100644 spec/input/day_01_test.txt
 create mode 100644 spec/solutions/day_01_spec.rb

diff --git a/lib/input/day_01.txt b/lib/input/day_01.txt
new file mode 100644
index 0000000..a56e078
--- /dev/null
+++ b/lib/input/day_01.txt
@@ -0,0 +1,1000 @@
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+13808   77214
+46006   40916
+66909   40537
+23234   93192
+10780   25237
+24124   94403
+32448   24651
+50298   11923
+76485   33163
+44318   33163
+90946   16526
+42022   14988
+85377   93717
+86170   70311
+73678   78731
+15538   96086
+15573   14484
+30475   17329
+91104   68007
+17132   88932
+18658   33543
+90097   42364
+26817   93717
+75870   81227
+26362   29410
+40595   79535
+50112   78405
+17611   36111
+90791   83486
+95109   82102
+74143   50625
+89442   77411
+11299   45357
+65424   21897
+17687   33543
diff --git a/lib/solutions/day_01.rb b/lib/solutions/day_01.rb
new file mode 100644
index 0000000..78b283f
--- /dev/null
+++ b/lib/solutions/day_01.rb
@@ -0,0 +1,42 @@
+class Day01
+  def part_one(input)
+    list_a = []
+    list_b = []
+
+    # Split lists of inputs
+    input.split("\n").each do |line|
+      parts = line.split(' ')
+      list_a << parts[0].to_i
+      list_b << parts[1].to_i
+    end
+
+    list_a.sort!
+    list_b.sort!
+
+    solution = 0
+    list_a.each_with_index do |a, i|
+      solution += (a - list_b[i]).abs
+    end
+
+    solution
+  end
+
+  def part_two(input)
+    list_a = []
+    list_b = []
+
+    # Split lists of inputs
+    input.split("\n").each do |line|
+      parts = line.split(' ')
+      list_a << parts[0].to_i
+      list_b << parts[1].to_i
+    end
+
+    solution = 0
+    list_a.each_with_index do |a, _i|
+      solution += a * list_b.count(a)
+    end
+
+    solution
+  end
+end
diff --git a/spec/input/day_01_test.txt b/spec/input/day_01_test.txt
new file mode 100644
index 0000000..b8af9ad
--- /dev/null
+++ b/spec/input/day_01_test.txt
@@ -0,0 +1,6 @@
+3   4
+4   3
+2   5
+1   3
+3   9
+3   3
diff --git a/spec/solutions/day_01_spec.rb b/spec/solutions/day_01_spec.rb
new file mode 100644
index 0000000..67985fc
--- /dev/null
+++ b/spec/solutions/day_01_spec.rb
@@ -0,0 +1,18 @@
+require 'spec_helper'
+require 'solutions/day_01'
+
+RSpec.describe Day01 do
+  let(:input) { File.read(File.join(__dir__, '..', '..', 'spec', 'input', 'day_01_test.txt')).strip }
+
+  describe '#part_one' do
+    it 'calculates the correct solutions for part one' do
+      expect(subject.part_one(input)).to eq(11)
+    end
+  end
+
+  describe '#part_two' do
+    it 'calculates the correct solutions for part two' do
+      expect(subject.part_two(input)).to eq(31)
+    end
+  end
+end