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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_na_cetvorki = 0; for(int i = 0; i < n; i++) { for(int j = i + 1; j < n; j++) { for(int k = j + 1; k < n; k++) { for(int l = k + 1; l < n; l++) { if(niza[i] * niza[k] == niza[j] * niza[l]) { broj_na_cetvorki++; } } } } } cout << broj_na_cetvorki << endl; return 0; }
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