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  1. def f(s0,e)
  2. 	s2=s0.dup
  3. 	s2=s2.gsub("X",e)
  4. 	return "" if s2.size>1 && s2[0]=="0"
  5. 	return s2
  6. end
  7.  
  8. while s=gets
  9. 	t1,r=s.chomp.split("=")
  10. 	l1,l2=t1.split("+")
  11. 	ans="NA"
  12. 	("0".."9").each{|e|
  13. 		l1t=f(l1,e)
  14. 		l2t=f(l2,e)
  15. 		rt=f(r,e)
  16. 		if l1t!="" && l2t!="" && rt!="" && l1t.to_i+l2t.to_i==rt.to_i then
  17. 			ans=e
  18. 			break
  19. 		end
  20. 	}
  21. 	puts ans
  22. end
Success #stdin #stdout 0.01s 6232KB
comments (?)
stdin
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123+4X6=X79
12X+4X6=X79
XX22+89=X2XX
stdout
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5
NA
1
https://ideone.com/X1Zgl2
language:
Ruby (ruby 2.5.5)
created:
1 year ago
visibility:
public

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