You're given $n$ integers $a_1,a_2,\dots,a_n$, you need to count the number of ways to choose some of them (no duplicate) to make the sum equal to $S$. Print the answer in modulo $10^9+7$. How to solve this problem in polynomial time?↵
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Note: The $n,S$ can be as large as $10^5$ so using single DP can't work. Using polygon $ln$ or $exp$ might work. But I don't know how to use them (I've just heard of it). Can anyone explain it?
↵
Note: The $n,S$ can be as large as $10^5$ so using single DP can't work. Using polygon $ln$ or $exp$ might work. But I don't know how to use them (I've just heard of it). Can anyone explain it?
