Envío 610

Código

#include <iostream>
#include <vector>
#include <list>

using namespace std;

void splitArray() {
  int n;
  cin >> n;
  vector<int> a(n);
  vector<long> a_sum(n);
  list<int> q;
  int prev = 0;
  for (int i = 0; i < n; ++i) {
    cin >> a[i];
    a_sum[i] = a[i] + prev;
    prev = a_sum[i];
  }
  long sum = 0;
  for (int i = n - 1; i > 0; --i) {
      sum += a[i];
      if (sum < 0) {
          q.push_back(i);
      }
  }
  while (q.empty() == false) {
      int rightIndex = q.back();
      q.pop_back();
      if (a_sum[rightIndex - 1] > 0) {
          cout << rightIndex << endl;
          return;
      }
  }
  cout << "Impossible" << endl;
}

int main() { splitArray(); }