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  1. $switch = lambda { |x| [lambda { |x| x / 2 }, lambda { |x| x * 3 + 1}][x % 2].call(x)}
  2.  
  3. def f(x, n)
  4.         if x != 1
  5.                 f($switch.call(x), n + 1)
  6.         else
  7.                 return n
  8.         end
  9. end
  10.  
  11. $length = 0
  12. (1..1000001).each do |n|
  13.         len = f(n, 1)
  14.         if len > $length
  15.                 $length = len
  16.                 puts len
  17.                 puts $length
  18.         end
  19. end
Time limit exceeded #stdin #stdout 5s 11144KB
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https://ideone.com/fr3Id9
language:
Ruby (ruby 2.5.5)
created:
8 years ago
visibility:
secret

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