solved part 2

day07/solution02.rb

@@ -0,0 +1,28 @@
+#!/bin/env ruby
+
+def can_hold? (bags, color)
+    parents = bags.map { |bag| bag[1..].
+        map { |child| bag[0] if child.include?(color)}
+    }.flatten.compact
+    if parents.any?
+        parents += parents.map { |col| can_hold?(bags, col) }
+    end
+    parents.flatten
+end
+
+def bags_inside (bags, color, num)
+    total = bags.map { |bag| bag[1..] if bag[0].include?(color) }
+    .flatten.compact.map { |item| [num * item[0].to_i,item[2..]] if item[0].to_i != 0}
+    if total.any?
+        total += total.map { |item| bags_inside(bags, item[1], item[0]) if item != nil}
+    end
+    total.flatten.compact
+end
+
+bags = File.readlines('./input').map { |line| line.delete('.').strip.split('contain').
+    map { |item| item.strip.split(',')}.flatten
+}
+bags.map { |line| line.map { |str| str.slice!('bags') }}
+bags.map { |line| line.map { |str| str.slice!('bag') }}
+bags.map { |line| line.map { |str| str.strip! }}
+p bags_inside(bags, 'shiny gold', 1).select { |item| item.is_a?(Integer)}.sum