Envío 1225

Código

#include <iostream>

using namespace std;

int main()
{
    int n;
    cin>>n;
    long sumsl[n];
    long sumsr[n];
    int i=0;
    long sum=0;
    int nums[n];
    for(;i<n;i++ )
    {
        cin >> nums[i];
        sum += nums[i];
        sumsl[i] =sum;
    }
    sum=0;
    for(i=n-1;i>=0;i-- )
    {
        sum += nums[i];
        sumsr[i] =sum;
    }
    bool possible;
    for(i=0;i<n-1;i++ )
    {
       long left = sumsl[i];
       long right = sumsr[i+1];
       if(left > 0 && right < 0)
       {
           possible = true;
           break;
       }
    }
    
    if(possible)
        cout << (i+1);
    else
        cout << "Impossible";

    return 0;
}