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->c,d{(c..d)[*c.to_a.map(&:to_s)d].join.count("1") ?1}
Try it online!-18 bytes, courtesy of Dingus.
Try it online!
->c,d{(c..d).to_a.map(&:to_s).join.count("1")}
->c,d{[*c..d].join.count ?1}
-18 bytes, courtesy of Dingus.
