Fill n - k + 1 elements with zeros

int main()
{
    optimize();
    int n,k;
    cin>>n>>k;
    k--;
    int z=k;
    bool b=0;
    int a[n+10];
    for(int i=0;i<n;i++)
    {
        if(k!=0)
        {
            if(b==0)
            {
                a[i]=k;
                b=1;
                z--;
            }
            else
            {
                if(z==0)
                {
                    a[i]=0;
                    k=0;
                    b=1;
                    continue;
                }
                a[i]=-k;
                k--;
                b=0;
                z--;
                if(z==0)
                    k=0;
            }
        }
        else
            a[i]=0;
    //dbg(z);
    }
    for(int i=n-1;i>=0;i--)
        cout<<a[i]<<" ";
    //return main();
}

when going to print 0 0 -3 3  or  -3 3 0 0 I am getting WA..But When I print 0 0 -1 1 I get AC..Why?what is the difference between 1st two case and last one??Can anyone explain me??

My algo generate array like [1, -1, 2, -2, 3, -3 ...,0], but i got WA27
Any suggetion's?
(Bad english)

Edited by author 25.08.2016 23:47

Only one subarray sum, isn't it?