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17 lines
486 B
17 lines
486 B
require "set"
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rules = ARGF.read.split("\n")
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.map {|line| line.split(" bags contain") }.to_h
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.transform_values {|v| v.scan(/(\d+) ([\w ]+) bags?/).map(&:reverse).to_h }
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# bags = rules.select {|_,v| v.has_key?("shiny gold") }.map(&:first).to_set
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# while true
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# bags.merge(bags.flat_map {|bag| rules.select {|_,v| v.has_key?(bag) }.map(&:first) })
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# p bags.size
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# end
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bags = Hash.new {|h,k|
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h[k] = rules.fetch(k).map {|k,v| v.to_i + h[k] * v.to_i }.sum
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}
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p bags["shiny gold"]
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