1 files changed, 64 insertions, 0 deletions
diff --git a/rb/day15.rb b/rb/day15.rb
new file mode 100755
index 0000000..1400862
--- /dev/null
+++ b/rb/day15.rb
@@ -0,0 +1,64 @@
+#!/usr/bin/env ruby
+
+class Ingredient
+  def initialize(nam, cap, dur, fla, tex, cal)
+    @name = nam
+    @capacity = cap
+    @durability = dur
+    @flavour = fla
+    @texture = tex
+    @calories = cal
+  end
+
+  attr_reader :capacity, :durability, :flavour, :texture, :calories
+
+  def self.parse(line)
+    name, data = line.strip.split(": ")
+    new(name, *data.scan(/(-?\d+)/).flatten.map(&:to_i))
+  end
+end
+
+def cookiescore(zip)
+  cap = zip.map { |qty, ing| qty * ing.capacity }.sum
+  cap = 0 if cap < 0
+  dur = zip.map { |qty, ing| qty * ing.durability }.sum
+  dur = 0 if dur < 0
+  fla = zip.map { |qty, ing| qty * ing.flavour }.sum
+  fla = 0 if fla < 0
+  tex = zip.map { |qty, ing| qty * ing.texture }.sum
+  tex = 0 if tex < 0
+
+  cap * dur * fla * tex
+end
+
+def cookiecal(zip)
+  zip.map { |qty, ing| qty * ing.calories }.sum
+end
+
+
+ingredients = File
+  .readlines("day15.input")
+  .map { |line| Ingredient.parse(line) }
+
+recipies = (0..100).to_a
+  .permutation(ingredients.length)
+  .select { |s| s.sum == 100 }
+
+
+bestscore = 0
+recipies.each do |recipe|
+  zip = recipe.zip(ingredients)
+  score = cookiescore(zip)
+  bestscore = score if score > bestscore
+end
+puts "Part 1: #{bestscore}"
+
+
+bestscore = 0
+recipies.each do |recipe|
+  zip = recipe.zip(ingredients)
+  next unless cookiecal(zip) == 500
+  score = cookiescore(zip)
+  bestscore = score if score > bestscore
+end
+puts "Part 2: #{bestscore}"