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- #include <iostream>
- using namespace std;
- int main()
- {
- int n;
- cin>>n;
- int niza[n];
- for(int i=0;i<n;i++)
- {
- cin>>niza[i];
- }
- int broj=0;
- for(int i=0;i<n;i++)
- {
- for(int j=i;j<n;j++)
- {
- if(niza[j] == 0) {
- broj += n - j;
- }
- }
- }
- cout << broj << endl;
- return 0;
- }
- // i4, 5, j0, 1, 2
- // n - j
- // 5 - 2 = 3
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