Envío 5881

Código

#include<iostream>
#include<vector>

using namespace std;

int main(){

	vector<int> in;
	int left = 0, act_left, right = 0, n, idx;
	bool possible = false;
	cin >> n;
	for (int i = 0; i < n; i ++){
		int k; cin>>k;
		in.push_back(k);
		right += k;
	}
	for (int i = 0; i < n; i ++){
		left += in[i];
		right -= in[i];
		if (left > 0 && right < 0) {
			possible = true;
			idx = i;
			act_left = left;
		}
	}
	if (possible) cout<<idx<<'\n';
	else cout<<"Impossible\n";



}