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  1. def _split(s)
  2.   s.chars.inject([]) {|a, c| a.empty? || a.last.first != c ? a << [c] : a.last << c; a}
  3. end
  4. def f9009(s)
  5.   _split(s).map {|a| a.size < 3 ? a.size.to_s + a.first : a.first}.join
  6. end
  7. p (0..10).inject(['0']) {|acc, _| acc << f9009(acc.last)}
  8.  
Success #stdin #stdout 0.02s 9720KB
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Standard input is empty
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["0", "10", "1110", "110", "2110", "122110", "11222110", "2122110", "1211222110", "11122122110", "12211222110", "11222122110"]
https://ideone.com/n0RoNr
language:
Ruby (ruby 2.5.5)
created:
7 years ago
visibility:
public

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