Envío 1498

Código

import java.util.Scanner;

public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        boolean loop = false;

        int [] a = new int[n];
        for (int i = 0; i < n; i++) {
            a[i] = sc.nextInt();
        }

        for (int p = 0; p < n; p++) {
            int left = 0, right = 0;
            for (int i = 0; i < p; i++) {
                left += a[i];
            }
            for (int i = p; i < n; i++) {
                right += a[i];
            }
            if (left > 0 && right < 0) {
                System.out.println(p);
                loop = true;
                break;
            }
        }
        if (!loop) {
            System.out.println("Impossible");
        }
	}
}