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added 48 characters in body

edited Mar 23, 2018 at 17:16

edited Mar 23, 2018 at 17:16

Ruby, 105 bytes

->s{m=s.split(?\n).map(&:size).sort;r=[*1..s=m.size]
s<2 || m[-1]<2?4:m[0]==m[-1]? s==m[0]?1:2:r==m ?3:4}

Anonymous lambda. Outputs:

answered Mar 23, 2018 at 16:56