题解 | #称砝码#

n = int(input())
weights = list(map(int, input().split()))
counts = list(map(int, input().split()))

s = {0}

for i in range(n):
    for _ in range(counts[i]):
        for w in list(s):   # "freeze" the elements to iterate over regardless of adds.
            s.add(weights[i] + w)
print(len(s))

Claude辅助作品，一开始想的是用dfs之类的...