Infinite-precision arithmetic

[Mikey]

You probably can find a long list of "ACM Programming Contest" long
math algorithms.  At least when I was on our College's team, the ACM
loved to put problems involving long math in the mix.  As far as I
know every team had ready-to-go source for long-math operations just
for that reason.  We only got burned by not being ready for this type
of situation once before we made sure we did.

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