Solution: using newton method:
Solving f(x) = 0, using iterative method: x_1 = x_0 - f(x_0) / f'(x_0).
So the iterative for sqrt(n) is
y = x/2 + N/(2x)
x = 2^ceil(numbits(N)/2)
y = floor((x + floor(N/x))/2)
if y >= x
x = y
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