/in/foo.cc: In member function 'void SeqList::Merge(SeqList&, SeqList&)':
/in/foo.cc:41:6: error: 'i' was not declared in this scope
  if (i == length)
      ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:62:13: error: 'i' was not declared in this scope
   cin >> a2[i];
             ^