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// 自己加的
template <class _BidirectionalIter1, class _BidirectionalIter2,
          class _Distance, class other_iterator_tag>
inline _BidirectionalIter2 __copy_backward(_BidirectionalIter1 __first,
                                           _BidirectionalIter1 __last,
                                           _BidirectionalIter2 __result,
                                           const other_iterator_tag &,
                                           _Distance*) {
  while (__first != __last)
    *--__result = *--__last;
  return __result;
}
// 原來的1
template <class _BidirectionalIter1, class _BidirectionalIter2,
          class _Distance>
inline _BidirectionalIter2 __copy_backward(_BidirectionalIter1 __first,
                                           _BidirectionalIter1 __last,
                                           _BidirectionalIter2 __result,
                                           const bidirectional_iterator_tag &,
                                           _Distance*) {
  while (__first != __last)
    *--__result = *--__last;
  return __result;
}
// 原來的2
template <class _RandomAccessIter, class _BidirectionalIter, class _Distance>
inline _BidirectionalIter __copy_backward(_RandomAccessIter __first,
                                          _RandomAccessIter __last,
                                          _BidirectionalIter __result,
                                          const random_access_iterator_tag &,
                                          _Distance*) {
  for (_Distance __n = __last - __first; __n > 0; --__n)
    *--__result = *--__last;
  return __result;
}

prog.cpp:19:50: error: ‘bidirectional_iterator_tag’ does not name a type
                                            const bidirectional_iterator_tag &,
                                                  ^
prog.cpp:19:77: error: ISO C++ forbids declaration of ‘parameter’ with no type [-fpermissive]
                                            const bidirectional_iterator_tag &,
                                                                             ^
prog.cpp:30:49: error: ‘random_access_iterator_tag’ does not name a type
                                           const random_access_iterator_tag &,
                                                 ^
prog.cpp:30:76: error: ISO C++ forbids declaration of ‘parameter’ with no type [-fpermissive]
                                           const random_access_iterator_tag &,
                                                                            ^
prog.cpp:27:27: error: redefinition of ‘template<class _RandomAccessIter, class _BidirectionalIter, class _Distance> _BidirectionalIter __copy_backward(_RandomAccessIter, _RandomAccessIter, _BidirectionalIter, const int&, _Distance*)’
 inline _BidirectionalIter __copy_backward(_RandomAccessIter __first,
                           ^
prog.cpp:16:28: error: ‘template<class _BidirectionalIter1, class _BidirectionalIter2, class _Distance> _BidirectionalIter2 __copy_backward(_BidirectionalIter1, _BidirectionalIter1, _BidirectionalIter2, const int&, _Distance*)’ previously declared here
 inline _BidirectionalIter2 __copy_backward(_BidirectionalIter1 __first,
                            ^

Standard output is empty