Uva 11054 洒交易（扫描法）

import java.util.*;import java.math.*;public class Main {public static void main(String[] args) {Scanner in=new Scanner(System.in);long n,a[]=new long[100005],sum; int i;while(in.hasNextLong()){n=in.nextLong();if(n==0) break;for(i=0;i<n;i++)a[i]=in.nextLong();for(sum=i=0;i<n-1;i++){a[i+1]+=a[i]; sum+=Math.abs(a[i]);}System.out.println(sum);}}}