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  1. #!/usr/bin/ruby
  2. if RUBY_PLATFORM=~/linux/
  3. 	if true
  4. 		require 'fiddle'
  5. 		__popcount_fn=Fiddle::Function.new(Fiddle::Handle::DEFAULT['__sched_cpucount'],[Fiddle::TYPE_INT,Fiddle::TYPE_VOIDP],Fiddle::TYPE_INT)
  6. 		define_method(:popcount){|n|__popcount_fn.call(8,[n].pack('q'))}
  7. 	else
  8. 		require 'fiddle/import'
  9. 		module LibC
  10. 			extend Fiddle::Importer
  11. 			dlload 'libc.so.6'
  12. 			extern 'int __sched_cpucount(int,long long*)'
  13. 		end
  14. 		def popcount(n) LibC.__popcountdi2(8,[n]) end
  15. 	end
  16. elsif RUBY_PLATFORM=~/darwin/
  17. 	if true
  18. 		require 'fiddle'
  19. 		__popcount_fn=Fiddle::Function.new(Fiddle::Handle::DEFAULT['__popcountdi2'],[Fiddle::TYPE_LONG],Fiddle::TYPE_INT)
  20. 		define_method(:popcount){|n|__popcount_fn.call(n)}
  21. 	else
  22. 		require 'fiddle/import'
  23. 		module LibC
  24. 			extend Fiddle::Importer
  25. 			dlload 'libSystem.dylib'
  26. 			extern 'int __popcountdi2(long)'
  27. 		end
  28. 		def popcount(n) LibC.__popcountdi2(n) end
  29. 	end
  30. else
  31. 	def popcount(n) n==0 ? 0 : popcount(n/2)+n%2 end
  32. end
  33.  
  34. p 1<<popcount(gets.to_i)
Success #stdin #stdout 0.05s 9872KB
comments (?)
stdin 
98765432
stdout 
8192
https://ideone.com/ffgjbt
codeiq red_and_white
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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