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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 teleportacii = 0;
- int broj_na_edinici = 0;
- for (int i = 0; i < n; i++)
- {
- if (niza[i] == 1)
- {
- broj_na_edinici++;
- }
- else if (niza[i] == 2)
- {
- teleportacii += broj_na_edinici;
- }
- }
- cout << teleportacii << endl;
- return 0;
- }
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