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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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