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instructions = ARGF.read.strip.scan(/(\w+) (dec|inc) (-?\d+) if (\w+) ([!<=>]+) (-?\d+)/m)
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max = 0
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registers = Hash.new(0)
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instructions.each do |instruction|
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condition_value = registers[instruction[-3]]
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if eval("#{condition_value} #{instruction[-2]} #{instruction[-1]}")
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value = registers[instruction[0]]
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case instruction[1]
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when "inc"
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value += instruction[2].to_i
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when "dec"
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value -= instruction[2].to_i
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else
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raise instruction
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end
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registers[instruction[0]] = value
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max = [value, max].max
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end
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end
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p max
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