Envío 3509

Código

#include <iostream>
#include <vector>

using namespace std;

void split(vector<long long> a, int n) {
    long long right = a[0];
    for (int i = 1; i < n; i++) {
        right += a[i];
    }

    int left = 0;
    for (int i = 0; i < n; i++) {
        left += a[i];

        if (left > 0 && right < left) {
            cout << i + 1 << endl;
            return;
        }

    }

    cout << "Impossible" << endl;

}

int main() {
    int n;
    cin >> n;

    vector<long long> a(n);
    for (int i = 0; i < n; i++) {
        cin >> a[i];
    }

    split(a, n);
}