1995: Energy

 1995: Energy

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Result	TIME Limit	MEMORY Limit	Run Times	AC Times	JUDGE
	3s	10240K	1093	298	Standard

Mr. Jojer is a very famous chemist. He is doing a research about behavior of a group of atoms. Atoms may have different energy and energy can be positive or negative or zero, e.g. 18 or -9. Absolute value of energy can not be more than 100. Any number of continuous atoms can form an atom-group. Energy of an atom-group is defined by the sum of energy of all the atoms in the group. All the atoms form an atom-community which is a line formed by all the atoms one by one. Energy of an atom-community is defined by the greatest energy of an atom-group that can be formed by atoms in the atom-community. The problem is, given an atom-community, to calculate its energy.

Input

The input contains several test cases. Each test case consists of two lines describing an atom-community. The first line of each test case contains an integer N(N<=1000000), the number of atoms in the atom-community. The second line of each test case contains N integers, separated by spaces, each representing energy of an atom, given in the order according to the atom-community. The last test case marks by N=-1, which you should not proceed.

Output

For each test case(atom-community description), print a single line containing the energy.

Sample Input

5
8 0 6 4 -1
-1

Sample Output

18

 

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This problem is used for contest: 3  163 

 

 

 

 

 

#include<stdio.h>
//b[j]=max{b[j-1]+a[j],a[j]},
int main()
{
    int n;
    while(scanf("%d",&n)==1)
    {
        if(n<0) break;
        int max,s;
        max=s=-1000000;
        while(n--)
        {
            int a;
            scanf("%d",&a);
            if(s>0) s+=a;
            else s=a;
            if(s>max) max=s;
        }
        printf("%d/n",max);
    }
    return 0;
}