Resolve day 2

2/script.rb

@@ -0,0 +1,24 @@
+#!/usr/bin/env ruby
+
+require_relative '../common'
+
+def part1
+  Input.new(__dir__).readlines.map do |gift|
+    l, w, h = gift.split('x').map(&:to_i)
+    areas = [l * w, w * h, h * l]
+
+    areas.map { |area| area * 2 }.sum + areas.min
+  end.sum
+end
+
+def part2
+  Input.new(__dir__).readlines.map do |gift|
+    dimensions = gift.split('x').map(&:to_i)
+    dimensions.sort[0, 2].sum * 2 + dimensions.inject(:*)
+  end.sum
+end
+
+puts "=== Part 1 ==="
+puts part1
+puts "=== Part 2 ==="
+puts part2