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1
$0=$0==0?1:and($0,$0-1)?2^int($0^.5+1):$0*2

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• # 2:   hide show   clone   input   134 days 23 hours ago    Success

  result: Success     time: 0.02s    memory: 4276 kB     returned value: 0

  input:

  0
  1
  2
  3
  4
  5
  511
  512
  

  output:

  1
  2
  4
  4
  8
  8
  8388608
  1024
  
• # 1:   hide show   clone   input   134 days 23 hours ago    Success

  result: Success     time: 0.01s    memory: 4276 kB     returned value: 0

  input:

  1
  2
  3
  4
  5

  output:

  2
  4
  4
  8
  8