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#include <iostream> using namespace std; int main() { int n; cin >> n; int niza[n]; int prefix_sum[n]; int sum = 0; for(int i = 0; i < n; i++) { cin >> niza[i]; sum += niza[i]; prefix_sum[i] = sum; } for(int i = 0; i < n; i++) { int leva_sum = 0; if(i != 0) { leva_sum = prefix_sum[i - 1]; } int desna_sum = prefix_sum[n - 1] - prefix_sum[i]; if(leva_sum == desna_sum) { cout << i + 1 << endl; return 0; } } cout << -1 << endl; return 0; }
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