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34 lines
835 B
34 lines
835 B
3 years ago
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class Probe
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def initialize(velocity, target)
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@velocity, @target = velocity, target
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end
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def each
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return enum_for(__method__) unless block_given?
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pos = [0,0]
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velocity = @velocity.clone
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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(velocity).map { _1.sum }
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velocity[0] -= 1 if velocity[0] > 0
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velocity[1] -= 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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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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haystack = (0..256).flat_map {|x| (-256..256).map {|y| [x, y] }}
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haystack.select! {|v| Probe.new(v, target).each.any? {|pos| target.zip(pos).all? { _1.cover?(_2) }}}
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# p haystack.map {|v| Probe.new(v, target).each.map { _2 }.max }.max
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p haystack.count
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