solved part 1

day07/solution01.rb

@@ -0,0 +1,18 @@
+#!/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.uniq
+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') }}
+p can_hold?(bags, 'shiny gold').length