Subset sums in $\BZ_p$
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Let $\BZ_p$ be the finite field of prime order $p$ and $A$ be a subset of $\BZ_p$. We prove several sharp results about the following two basic questions:
(1) When can one represent zero as a sum of distinct elements of $A$ ?
(2) When can one represent every element of $\BZ_p$ as a sum of distinct elements of $A$ ?