# include <iostream.h>
int main()
{
    int W[21];
    int N,a,b;
    cin>>N;
    if (N>=1 && N<=20)
    {
        for (a=0;a<=N-1;a++)
            cin>> W[a];
        for (a=0;a<=N-2;a++)
        {
            for(b=a+1;b<=N-1;b++)
            {
                if (W[a]>W[b])
                {
                    W[a]=W[b]+W[a];
                    W[b]=W[a]-W[b];
                    W[a]=W[a]-W[b];
                }
            }
        }
        cout << W[1]-W[0];
    }
    return 0;
}

I think,you're the dunkey!!!!!!!!!!!!