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22 lines
476 B
22 lines
476 B
id = proc {|r, c| r * 8 + c }
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seats = ARGF.read.split("\n")
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.map {|pass| pass.tr("FB", "01").tr("LR", "01") }
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.map {|pass| pass.to_i(2) }
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.map {|pass|
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row = pass >> 3
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col = pass & 0b111
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[row, col]
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}
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# p seats.map(&id).max # day 1
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rows = seats.map(&:first).minmax
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cols = seats.map(&:last).minmax
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all_seats = Range.new(*rows).flat_map {|r|
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Range.new(*cols).map {|c|
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[r, c]
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}
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}
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seat = (all_seats - seats).find {|r,_| !rows.include?(r) }
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p id[*seat]
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