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Monkey = Struct.new(:id, :items, :operation, :test, :t, :f) do
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def throw_to(item)
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(item % test).zero? ? t : f
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end
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end
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MONKEY_RE = /Monkey (?<id>\d+):
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Starting items: (?<items>(?~\n))
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Operation: new = (?<op>(?~\n))
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Test: divisible by (?<test>\d+)
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If true: throw to monkey (?<t>\d+)
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If false: throw to monkey (?<f>\d+)/m
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monkeys = ARGF.read.split("\n\n").map {|monkey|
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md = MONKEY_RE.match(monkey)
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fail if md.nil?
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Monkey.new(
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md[:id].to_i,
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md[:items].split(", ").map(&:to_i),
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md[:op],
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md[:test].to_i,
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md[:t].to_i,
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md[:f].to_i,
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)
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}
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max_worry = monkeys.map(&:test).inject(:*)
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inspections = Hash.new(0)
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# 20.times do
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10_000.times do
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monkeys.each do |monkey|
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until monkey.items.empty?
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inspections[monkey.id] += 1
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item = monkey.items.shift
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old = item
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item = eval(monkey.operation)
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# item /= 3
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item %= max_worry
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to = monkey.throw_to(item)
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monkeys[to].items << item
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end
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end
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end
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p inspections.values.max(2).inject(:*)
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