My OS: Linux Ubuntu 10.10
I use gcc 4.4.5 (don't have OS Windows)
On my computer no errors and warnings

Program source:

#include <iostream>

#define abs(x) ((x)<0 ? -(x) : (x))

using namespace std;

int main()
{
    short n;
    long sum = 0;
    long firstSum = 0;
    long secondSum = 0;
    cin >> n;
    long w[n];
    for(int i=0; i<n; i++)
    {
        cin >> w[i];
        sum+=w[i];
    }
    sum>>=1;
    long temp = w[0];
    int num = 0;
    for(int i=0; i<n; i++)
    {
        if(temp<w[i])
        {
            temp = w[i];
            num = i;
        }
    }
    firstSum+=temp;
    w[num] = 0;
    for(int i=1; i<n; i++)
    {
        num = 0;
        while(w[num]==0)
        {
            num++;
        }
        temp = w[num];
        for(int j=0; j<n; j++)
        {
            if((temp>w[j])&&(w[j]!=0))
            {
                temp = w[j];
                num = j;
            }
        }
        w[num] = 0;
        if(firstSum+temp<sum)
        {
            firstSum+=temp;
        }
        else
        {
            secondSum+=temp;
        }
    }
    cout << abs(firstSum-secondSum) << endl;
    return 0;
}