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Bignum arithmetic
Bignum arithmetic is not often required in contests now (if the answer to the problem can be large, then more often you will be asked to calculate the remainder by some modulo), but nevertheless you need to have an idea about algorithms and be able to write them.
Theory of bignum arithmetic (V. Goldstein)
A video recording of a lecture from some SIS (I suspect that SIS.2008.C)
Theory of bignum arithmetic (V. Goldstein)
A video recording of a lecture from some SIS (I suspect that SIS.2008.C)
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