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def fire(v, target)
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return enum_for(__method__, v, target) unless block_given?
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pos = [0,0]
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v_x, v_y = v
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loop do
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yield pos
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return if target.zip(pos).all? { _1.cover?(_2) }
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pos = pos.zip([v_x, v_y]).map { _1.sum }
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v_x -= 1 if v_x > 0
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v_y -= 1
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return if pos[0] > target[0].end
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return if pos[1] < target[1].begin
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end
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end
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input = ARGF.read.scan(/x=(.+), y=(.+)/)
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target = input[0].map { eval(_1) }
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xs = (0..target[0].end).select { (1.._1).sum > target[0].begin }
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haystack = xs.flat_map {|x| (-256..256).map {|y| [x, y] }}
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haystack.select! {|v| fire(v, target).each.any? {|pos| target.zip(pos).all? { _1.cover?(_2) }}}
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# p haystack.map {|v| fire(v, target).each.map { _2 }.max }.max
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p haystack.count
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