python-algorithm
[백준] 14929
무적김두칠
2021. 1. 15. 10:47
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n=int(input())
tmp=list(map(int, input().split()))
mysum=[]
mysum.append(tmp[0])
ans=0
for i in range(1,n):
mysum.append(mysum[i-1]+tmp[i])
for i in range(n):
ans+=tmp[i]*(mysum[n-1]-mysum[i])
print(ans)
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cs |
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