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 C (judge verdict: Wrong Answer)

#include<stdio.h>
#include<math.h>
int main(){
	int n,sums[5000],a,b,i;
	for(;~scanf("%d",&a);){
		for(i=0;i++<a;sums[i]=sums[i-1]+b){
			scanf("%d",&b);
		}
		n=-9e9;
		for(i=0;i<a;i++){
			for(b=i;b<=a;b++){
				n=fmax(n,sums[b+1]-sums[a]);
			}
		}
		printf("%d\n",n);
	}
	return 0;
}