Problem:
Maximum Sum Sequence

Given a sequence of numbers a1, a2, a3, ..., an, find the maximum sum of a contiguous subsequence of those numbers. Note that, a subsequence of one element is also a contiquous subsequence.

Input

The input consists of multiple datasets. Each data set consists of:

n
a1
a2
.
.
an

You can assume that 1 ≤ n ≤ 5000 and -100000 ≤ ai ≤ 100000.

The input end with a line consisting of a single 0.

Output

For each dataset, print the maximum sum in a line.

Sample Input

7
-5
-1
6
4
9
-6
-7
13
1
2
3
2
-2
-1
1
2
3
2
1
-2
1
3
1000
-200
201
0

Output for the Sample Input

19
14
1001

Solution in JAVA (judge verdict: Accepted)

import java.util.*;

public class Main {
    public static void main(String[] arg) throws java.io.IOException {
        Scanner scan = new Scanner(System.in);
        while (true) {
            int n = scan.nextInt();
            if (n == 0)
                break;
            int[] a = new int[n];
            int max = -500000000;
            for (int i = 0; i < n; i++)
                a[i] = scan.nextInt();
            for (int i = 0; i < n; i++) {
                int sum = 0;
                for (int j = i; j < n; j++) {
                    sum += a[j];
                    max = Math.max(max, sum);
                }
            }
            System.out.println(max);
        }
    }
}