8 lines
213 B
Ruby
8 lines
213 B
Ruby
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def middle_square (seed)
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return to_enum(__method__, seed) unless block_given?
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s = seed.digits.size
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loop { yield seed = (seed*seed).to_s.rjust(s*2, "0")[s/2, s].to_i }
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end
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puts middle_square(675248).take(5)
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