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110 lines
2.5 KiB
110 lines
2.5 KiB
require "set"
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steps = ARGF.read.scan(/(on|off) x=(.+),y=(.+),z=(.+)/)
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.map {|power, *ranges| [power == "on", *ranges.map { eval(_1) }] }
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# .select {|_, *ranges| ranges.all? { _1.begin >= -50 && _1.end <= 50 }}
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# reactor = Hash.new(false)
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# steps.each do |power,x,y,z|
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# x.each do |x|
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# y.each do |y|
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# z.each do |z|
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# reactor[[x,y,z]] = power
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# end
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# end
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# end
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# end
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# p reactor.count { _2 }
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# xs = steps.flat_map { [_2.begin, _2.end] }.minmax
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# ys = steps.flat_map { [_3.begin, _3.end] }.minmax
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# zs = steps.flat_map { [_4.begin, _4.end] }.minmax
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# ons = Range.new(*xs).sum {|x| Range.new(*ys).sum {|y| Range.new(*zs).count {|z|
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# step = steps.find { _2.cover?(x) && _3.cover?(y) && _4.cover?(z) }
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# step ? step[0] : false
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# }}}
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# p ons
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class Range
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def overlap(other)
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if cover?(other.begin)
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min = other.begin
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max = [self.end, other.end].min
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(min..max)
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elsif cover?(other.end)
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min = [self.begin, other.begin].max
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max = other.end
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(min..max)
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elsif other.cover?(self.begin)
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min = self.begin
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max = [self.end, other.end].min
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(min..max)
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elsif other.cover?(self.end)
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min = [self.begin, other.begin].max
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max = self.end
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(min..max)
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else
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nil
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end
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end
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def split(other)
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overlap = self.overlap(other)
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return [] if overlap.nil?
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splits = [ overlap ]
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splits << (self.begin..overlap.begin-1) if overlap.begin > self.begin
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splits << (overlap.end+1..self.end) if overlap.end < self.end
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splits
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end
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end
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Cube = Struct.new(:xs, :ys, :zs) do
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def -(other)
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return self unless o = overlap(other)
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xxs = xs.split(other.xs)
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yys = ys.split(other.ys)
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zzs = zs.split(other.zs)
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cuboids = xxs.flat_map {|x| yys.flat_map {|y| zzs.map {|z|
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Cube.new(x, y, z)
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}}}
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cuboids.delete(o)
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cuboids
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end
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def overlap(other)
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overlaps = to_a.zip(other.to_a).map { _1.overlap(_2) }
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return nil if overlaps.any?(&:nil?)
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Cube.new(*overlaps)
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end
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def overlap?(other) = !overlap(other).nil?
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def volume = (xs.end - xs.begin + 1) * (ys.end - ys.begin + 1) * (zs.end - zs.begin + 1)
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def to_s = "[#{[xs, ys, zs].map(&:to_s).join(", ")}]"
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alias_method :inspect, :to_s
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end
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steps = steps.map {|power, *ranges| [power, Cube.new(*ranges)] }
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reactor = Set.new
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steps.each do |power, cube|
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reactor
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.select { _1.overlap?(cube) }
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.each do |overlap|
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reactor.delete(overlap)
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reactor.merge(overlap - cube)
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end
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reactor << cube if power
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end
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p reactor.sum(&:volume)
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