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#include <iostream> #include <vector> using namespace std; vector<int> pref_sum; int n; int suma(int i, int j) { if(j < 0 or j >= n) { return 0; } if(i - 1 < 0) { return pref_sum[j]; } return pref_sum[j] - pref_sum[i - 1]; } int main() { cin >> n; int niza[n]; for(int i = 0; i < n; i++) { cin >> niza[i]; } int sum = 0; for(int i = 0; i < n; i++) { sum += niza[i]; pref_sum.push_back(sum); } for(int i = 0; i < n; i++) { int S = 0; int E = i - 1; int sum_left = suma(S, E); S = i + 1; E = n - 1; int sum_right = suma(S, E); if(sum_left == sum_right) { cout << i + 1 << endl; return 0; } } cout << -1 << endl; return 0; }
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