blob: 378f7c60c46d29df6f4afaef6ef3a397d3b41307 (
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missing = 0
File.readlines('input.txt').map do |line|
line.tr('FBLR', '0101')
end.map do |line|
row = line.slice(0, 7).to_i 2
seat = line.slice(7, 3).to_i 2
row * 8 + seat
end.sort.reduce do |last_seen, current|
if current - 1 != last_seen
missing = current - 1
end
current
end
puts missing
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