Envío 3165

Código

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.StringTokenizer;

public class Main {

    public static void main(String[] args) throws Throwable {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st;
        for(String ln; (ln=in.readLine())!=null;) {
            int N = Integer.parseInt(ln);
            st = new StringTokenizer(in.readLine());
            int[] values = new int[N];
            int left =0, total =0, right = 0;
            for(int i=0;i<N;i++) {
                right+= values[i] = Integer.parseInt(st.nextToken());
            }
            for( int p=0; p<N; p++){
                if(left>0 && right<0){
                    System.out.println(p);
                    return;
                }
                right -=values[p];
                left+=values[p];
            }
            System.out.println("Impossible");
        }
    }
}