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class CPU
def initialize
@x = 1
@cycle = 1
@iq = []
end
attr_reader :x, :cycle
def enq(op, arg = 0)
@iq << [
arg,
case op
when 'noop'; 1
when 'addx'; 2
end
]
end
def done?
@iq.empty?
end
def clock
istr = @iq[0]
istr[1] -= 1
if istr[1] == 0
@x += istr[0]
@iq.shift
end
@cycle += 1
end
end
cpu = CPU.new
istrs = $stdin.readlines.map(&:strip).map(&:split)
istrs.each do |istr|
cpu.enq(istr[0], istr[1]&.to_i || 0)
end
strsum = 0
until cpu.done?
c = cpu.cycle
x = cpu.x
strsum += (c * x) if (c - 20) % 40 == 0
cpu.clock
end
puts strsum
|
