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advent-of-code/day_10.rb

10 lines
207 B

9 years ago
class Integer
def look_and_say
self.to_s.chars.slice_when {|a,b| a != b }.map {|i| "#{i.size}#{i[0]}" }.join.to_i
end
end
seed = 1113122113
40.times { seed = seed.look_and_say }
puts seed.to_s.size