In [1]:

    

data = "7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883999097908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"


    

    
Out[1]:





"7316717653133062491922511967442657474235534919493496983520312774506326239578318016984801869478851843858615607891129494954595017379583319528532088055111254069874715852386305071569329096329522744304355766896648950445244523161731856403098711121722383113622298934233803081353362766142828064444866452387493035890729629049156044077239071381051585930796086670172427121883998797908792274921901699720888093776657273330010533678812202354218097512545405947522435258490771167055601360483958644670632441572215539753697817977846174064955149290862569321978468622482839722413756570560574902614079729686524145351004748216637048440319989000889524345065854122758866688116427171479924442928230863465674813919123162824586178664583591245665294765456828489128831426076900422421902267105562632111110937054421750694165896040807198403850962455444362981230987879927244284909188845801561660979191338754992005240636899125607176060588611646710940507754100225698315520005593572972571636269561882670428252483600823257530420752963450"

In [2]:

    

require 'fiber'


    

    
Out[2]:





true

In [3]:

    

data.length


    

    
Out[3]:





1000

In [30]:

    

f = Fiber.new do
  start_index = 0
  end_index = 4
  
  (0..1000-5).each do |i|
    Fiber.yield data[start_index..end_index].split("").map{|i|i.to_i}.inject(&:*)
    start_index += 1
    end_index += 1    
  end
end


    

    
Out[30]:





#<Fiber:0x007f0bf4e1bdb8>

In [31]:

    

max = 0

begin
  target = f.resume
  max = target.to_i if target.to_i > max
end while f.alive?


    

    




NoMethodError: undefined method `to_i' for 0..995:Range
(pry):211:in `<main>'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:369:in `eval'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:369:in `evaluate_ruby'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:334:in `handle_line'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:270:in `block (2 levels) in eval'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:269:in `catch'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:269:in `block in eval'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:268:in `catch'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/pry-1.0.0.pre1/lib/pry/pry_instance.rb:268:in `eval'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/iruby-0.1.7/lib/iruby/backend.rb:35:in `eval'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/iruby-0.1.7/lib/iruby/kernel.rb:105:in `execute_request'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/iruby-0.1.7/lib/iruby/kernel.rb:57:in `run'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/iruby-0.1.7/lib/iruby/command.rb:29:in `run_kernel'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/iruby-0.1.7/lib/iruby/command.rb:16:in `run'
/home/hsin/.rbenv/versions/2.0.0-p247/lib/ruby/gems/2.0.0/gems/iruby-0.1.7/bin/iruby:6:in `<top (required)>'
/home/hsin/.rbenv/versions/2.0.0-p247/bin/iruby:23:in `load'
/home/hsin/.rbenv/versions/2.0.0-p247/bin/iruby:23:in `<main>'

In [32]:

    

max


    

    
Out[32]:





40824

In [ ]: