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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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