Envío 4610

Código

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;

public class Main {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        int n = Integer.parseInt(br.readLine());
        String[] numsS = br.readLine().split(" ");
        int[] nums = new int[n];
        int left = 0;
        int right = 0;
        for (int i = 0; i < n; i++) {
            nums[i] = Integer.parseInt(numsS[i]);
            right += nums[i];
        }
        boolean foundSolution = false;
        for (int i = 0; i < n && !foundSolution; i++) {
            left += nums[i];
            right -= nums[i];
            if (left > 0 && right < 0) {
                foundSolution = true;
                bw.write((i + 1) + "\n");
            }
        }
        if (!foundSolution) {
            bw.write("Impossible\n");
        }
        br.close();
        bw.close();
    }
}