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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 kombinacii = 0;
- for(int a = 0; a < n; a++) {
- for(int b = a + 1; b < n; b++) {
- for(int c = b + 1; c < n; c++) {
- for(int d = c + 1; d < n; d++) {
- if(niza[a] * niza[c] == niza[b] * niza[d]) {
- kombinacii++;
- }
- }
- }
- }
- }
- cout << kombinacii << endl;
- return 0;
- }
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