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added 7 characters in body

edited Mar 23, 2018 at 20:59

edited Mar 23, 2018 at 20:59

Ruby, (削除) 115 (削除ここまで) 111 bytes

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

Anonymous lambda. Outputs:

answered Mar 23, 2018 at 16:56