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Your first problem is $\mathsf{NP}$-Complete. Membership to $\mathsf{NP}$ is trivial. To see that it is $\mathsf{NP}$-hard, you can reduce it from Subset Sum. Let $\langle S_1, W_1 \rangle$ be an instance of Subset Sum. Define $S_2$ as the multiset obtained by multiplying each number in $S_1$ by $100$, and $W_2 = 100 W_1$. The instance for your problem is $\...

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