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def up_array(arr)
	((arr.join.to_i) + 1).to_s.chars.map(&:to_i) unless arr.any?{ |i| i < 0; return nil}
end
 
p up_array([5, 7, 7])

Success #stdin #stdout 0.08s 9712KB

stdin

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Standard input is empty

stdout

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nil

https://ideone.com/p95sdq

language:

Ruby (ruby 2.5.5)

created:

visibility:

public

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