杭电oj2020（JAVA

import java.util.Scanner;

public class Main2020 {

	public static void main(String[] args) {
		Scanner sc=new Scanner(System.in);
		while(sc.hasNext()){
			int n=sc.nextInt();
			int arr[]=new int[n];
			if(n==0){break;}
			for (int i = 0; i < arr.length; i++) {
				arr[i]=sc.nextInt();
			}
			for (int i = 0; i < n-1; i++) {
				for (int j = 0; j < n-1; j++) {
					if(Math.abs(arr[j])