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46 lines
935 B
46 lines
935 B
2 weeks ago
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garden = DATA.readlines(chomp: true).flat_map.with_index {|row, y|
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row.chars.map.with_index {|id, x| [[y,x], id] }
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}.to_h
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DELTAS = [[-1, 0], [1, 0], [0, -1], [0, 1]]
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queue = Set[*garden.keys]
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plots = [Set[queue.first]]
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until queue.empty?
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yx = plots.last.select { queue.include?(_1) }.first
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if yx.nil?
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plots << Set[queue.first] if queue.first
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next
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end
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queue.delete(yx)
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id = garden.fetch(yx)
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neighbors = DELTAS
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.map {|d| yx.zip(d).map { _1 + _2 }}
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.select { garden.fetch(_1, nil) == id }
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if neighbors.empty?
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plots << Set[queue.first] if queue.first
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else
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plots.last.merge(neighbors)
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end
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end
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perimeter = ->(plot) {
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plot.flat_map {|yx|
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DELTAS
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.map {|delta| yx.zip(delta).map { _1 + _2 }}
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.reject { garden.fetch(_1, nil) == garden[plot.first] }
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}
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}
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pp plots
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.map { [garden.fetch(_1.first), _1.size, perimeter[_1].size] }
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.sum { _2 * _3 }
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__END__
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AAAA
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BBCD
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BBCC
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EEEC
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