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  1. cs=[0]*101
  2. n,d=gets.split(" ").map{|e| e.to_i}
  3. xs=gets.split(" ").map{|e| e.to_i}
  4. xs.each{|e|
  5. 	cs[e]+=1
  6. }
  7.  
  8. 0.upto(100){|d3|
  9. 	 cs[d3]%=2
  10. 	 1.upto(d){|d2|
  11. 		u3=d2+d3
  12. 		next if 100<u3
  13. 		if 0<cs[d3] && 0<cs[u3] then
  14. 			d0=[cs[d3],cs[u3]].min
  15. 			cs[d3]-=d0
  16. 			cs[u3]-=d0
  17. 		end
  18. 	}
  19. }
  20. if cs.sum==0 then
  21. 	puts "Yes"
  22. else
  23. 	puts "No"
  24. end
  25.  
Success #stdin #stdout 0.01s 8088KB
comments (?)
stdin 
1 5
2 7
stdout 
Yes
https://ideone.com/1wPctQ
language:
Ruby (ruby 2.5.5)
created:
6 hours ago
visibility:
public

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