#define max(a,b)            (((a) > (b)) ? (a) : (b))

int findMax( int * mas, int size )
{
    if( size == 1 )
        return mas[0];

    return max( findMax( mas, size / 2 ), findMax( mas + size / 2, size - size / 2 ) );
}

int main()
{
    const int N     = 5;
    int       ar[N] = { 2, 1, 5, 9, 3 };

    cout << "array: ";
    for( int i = 0; i < N; i++ )
        cout << ar[i] << ' ';

    cout << "nmax  : " << findMax( ar, N ) << endl;

    return 0;
}