Resolve day 1

1/script.rb

@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+
+require_relative '../common'
+
+def part1
+  input = Input.new(__dir__).readlines.join
+  input.count('(') - input.count(')')
+end
+
+def part2
+  input = Input.new(__dir__).readlines.join
+
+  input.chars.each_with_index.inject(0) do |floor, (char, i)|
+    return i if floor < 0
+    char == '(' ? floor + 1 : floor - 1
+  end
+
+  nil
+end
+
+puts "=== Part 1 ==="
+puts part1
+puts "=== Part 2 ==="
+puts part2

common.rb

@@ -0,0 +1,11 @@
+class Input
+  FILE = 'input'
+
+  def initialize(directory, file = nil)
+    @filename = "#{directory}/#{file || FILE}"
+  end
+
+  def readlines
+    File.readlines(@filename).reject { |line| line.start_with?('#') }
+  end
+end