#codingexercise
bool SequenceEqual(int[] A, int[] B)
{
   if ( A == null || B == null) return false;
   if ( A == B ) return true;
   if (A.Length != B.Length) return false;
   for (int i = 0; i < A.Length; i++)
        if (A[i] != B[i]) return false;
   return true;
}

Int getSum ( int [] A)
{
      If (A == null) return 0;
      Return A.Sum();
}