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26 lines
601 B
26 lines
601 B
instructions = ARGF.read.lines(chomp: true)
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adds = {}
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cycle = 1
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instructions.each do |instruction|
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cycle += case instruction
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when /noop/
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1
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when /addx (-?\d+)/
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adds[cycle+1] = $1.to_i
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2
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else fail instruction
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end
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end
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xs = (0..adds.keys.max).inject([1]) { _1 << _1.last + adds.fetch(_2, 0) }
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p 20.step(by: 40, to: 220).map { [_1, xs[_1]] }.sum { _1 * _2 }
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puts 6.times.map {|y|
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40.times.map {|x|
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cycle = 40*y + x + 1
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xx = xs.fetch(cycle, xs.last)
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(-1..1).cover?(x - xx) ? ?# : ?.
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}.join
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}.join("\n")
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