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n=int(input())
tab=input()
s=0
wschod=0
for i in range(n):
	if tab[i*2]=='0':
		wschod+=1
	else:
		 s+=wschod
print(s)

Success #stdin #stdout 0.03s 9868KB

stdin

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5
1 0 0 1 1

stdout

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https://ideone.com/W1L4bj

language:

Python 3 (python 3.9.5)

created:

visibility:

public

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