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10.rb
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10.rb
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instructions = DATA.readlines
x = 1
cycle = 0
signal_strengths = []
signal_intervals = (-20..(instructions.count * 2)).step(40).to_a
pixels = []
instructions.each do |instruction|
cycle += 1
signal_strengths << x * cycle if signal_intervals.include?(cycle)
pixels << ([x - 1, x, x + 1].any? { (cycle % 40) - 1 == _1 } ? '#' : '.')
next if instruction.start_with?('noop')
cycle += 1
signal_strengths << x * cycle if signal_intervals.include?(cycle)
pixels << ([x - 1, x, x + 1].any? { (cycle % 40) - 1 == _1 } ? '#' : '.')
_k, inc = instruction.split(' ')
x += Integer(inc)
end
pp "A: #{signal_strengths.sum}"
# B
pixels.each_slice(40) do |chunk|
p chunk.join
end
__END__
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