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function pisum()
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local sum
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for j = 1,500 do
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sum = 0.0
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for k = 1,10000 do
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sum = sum + 1.0/(k*k)
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end
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end
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return sum
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end
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t1 = os.clock()
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assert(math.abs(pisum()-1.644834071848065) < 1e-12)
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t2 = os.clock()
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print("time taken ", t2-t1)
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