Envío 5488

Código

#include <bits/stdc++.h>
#define REP(i,n) for(int i=0; i<n;i++)
#define pb push_back
#define ff first
#define ss second
#define ii pair<int,int>
#define vi vector<int>
#define vii vector<ii>
#define lli long long int
#define fast_io ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
using namespace std;
ostream& operator<<(ostream& os, const vector<int> &v){
    for(auto const &i: v){
        os<<i<<" ";
    }
    os<<endl;
    return os;
}
const lli mod=(1e9)+7;
const int N = 1e4+1;
int main(){
    fast_io;
    int n;cin>>n;
    int nums[n];
    REP(i,n)cin>>nums[i];
    for(int i=n-2; i>=0; i--){
        nums[i]+=nums[i+1];
    }
    int ans = -1;
    for(int i=n-1; i>=0; i--){
        if(nums[i]<0){
            ans = i;
        }
    }
    //REP(i,n)cout<<nums[i]<<endl;
    if(ans!=-1 && ans!=0 && ans!=n-1)cout<<ans<<endl;
    else cout<<"Impossible"<<endl;
    return 0;
}