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#41602: python


suyueh (suyueh)

b294. 經濟大恐荒 -- 板橋高中 教學題 | From: [125.229.229.84] | 發表日期: 2024-08-09 16:05
r = 0
t = int(input())
a = input()
a = a.split()
for i in range(1, t+1):
    r = r + i * int(a[i-1])
print(r)
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