/in/foo.cc:1:1: error: stray '\' in program
 \\c++有reverse函数可以直接调用
 ^
/in/foo.cc:1:2: error: stray '\' in program
 \\c++有reverse函数可以直接调用
  ^
/in/foo.cc:1:6: error: stray '\346' in program
 \\c++有reverse函数可以直接调用
      ^
/in/foo.cc:1:7: error: stray '\234' in program
 \\c++有reverse函数可以直接调用
       ^
/in/foo.cc:1:8: error: stray '\211' in program
 \\c++有reverse函数可以直接调用
        ^
/in/foo.cc:1:16: error: stray '\345' in program
 \\c++有reverse函数可以直接调用
                ^
/in/foo.cc:1:17: error: stray '\207' in program
 \\c++有reverse函数可以直接调用
                 ^
/in/foo.cc:1:18: error: stray '\275' in program
 \\c++有reverse函数可以直接调用
                  ^
/in/foo.cc:1:19: error: stray '\346' in program
 \\c++有reverse函数可以直接调用
                   ^
/in/foo.cc:1:20: error: stray '\225' in program
 \\c++有reverse函数可以直接调用
                    ^
/in/foo.cc:1:21: error: stray '\260' in program
 \\c++有reverse函数可以直接调用
                     ^
/in/foo.cc:1:22: error: stray '\345' in program
 \\c++有reverse函数可以直接调用
                      ^
/in/foo.cc:1:23: error: stray '\217' in program
 \\c++有reverse函数可以直接调用
                       ^
/in/foo.cc:1:24: error: stray '\257' in program
 \\c++有reverse函数可以直接调用
                        ^
/in/foo.cc:1:25: error: stray '\344' in program
 \\c++有reverse函数可以直接调用
                         ^
/in/foo.cc:1:26: error: stray '\273' in program
 \\c++有reverse函数可以直接调用
                          ^
/in/foo.cc:1:27: error: stray '\245' in program
 \\c++有reverse函数可以直接调用
                           ^
/in/foo.cc:1:28: error: stray '\347' in program
 \\c++有reverse函数可以直接调用
                            ^
/in/foo.cc:1:29: error: stray '\233' in program
 \\c++有reverse函数可以直接调用
                             ^
/in/foo.cc:1:30: error: stray '\264' in program
 \\c++有reverse函数可以直接调用
                              ^
/in/foo.cc:1:31: error: stray '\346' in program
 \\c++有reverse函数可以直接调用
                               ^
/in/foo.cc:1:32: error: stray '\216' in program
 \\c++有reverse函数可以直接调用
                                ^
/in/foo.cc:1:33: error: stray '\245' in program
 \\c++有reverse函数可以直接调用
                                 ^
/in/foo.cc:1:34: error: stray '\350' in program
 \\c++有reverse函数可以直接调用
                                  ^
/in/foo.cc:1:35: error: stray '\260' in program
 \\c++有reverse函数可以直接调用
                                   ^
/in/foo.cc:1:36: error: stray '\203' in program
 \\c++有reverse函数可以直接调用
                                    ^
/in/foo.cc:1:37: error: stray '\347' in program
 \\c++有reverse函数可以直接调用
                                     ^
/in/foo.cc:1:38: error: stray '\224' in program
 \\c++有reverse函数可以直接调用
                                      ^
/in/foo.cc:1:39: error: stray '\250' in program
 \\c++有reverse函数可以直接调用
                                       ^
/in/foo.cc:1:3: error: 'c' does not name a type
 \\c++有reverse函数可以直接调用
   ^
In file included from /usr/include/c++/6/iosfwd:40:0,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/postypes.h:98:11: error: 'ptrdiff_t' does not name a type
   typedef ptrdiff_t streamsize; // Signed integral type
           ^~~~~~~~~
In file included from /usr/include/c++/6/exception:172:0,
                 from /usr/include/c++/6/ios:39,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/include/c++/6/bits/exception_ptr.h:99:30: error: field 'nullptr_t' has incomplete type 'std::__exception_ptr::exception_ptr'
       exception_ptr(nullptr_t) noexcept
                              ^
/usr/include/c++/6/bits/exception_ptr.h:79:11: note: definition of 'class std::__exception_ptr::exception_ptr' is not complete until the closing brace
     class exception_ptr
           ^~~~~~~~~~~~~
/usr/include/c++/6/bits/exception_ptr.h:99:30: error: expected ';' at end of member declaration
       exception_ptr(nullptr_t) noexcept
                              ^
/usr/include/c++/6/bits/exception_ptr.h:99:32: error: expected unqualified-id before 'noexcept'
       exception_ptr(nullptr_t) noexcept
                                ^~~~~~~~
In file included from /usr/include/c++/6/bits/move.h:57:0,
                 from /usr/include/c++/6/bits/nested_exception.h:40,
                 from /usr/include/c++/6/exception:173,
                 from /usr/include/c++/6/ios:39,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/include/c++/6/type_traits:359:31: error: 'std::size_t' has not been declared
   template<typename _Tp, std::size_t _Size>
                               ^~~~~~
/usr/include/c++/6/type_traits:360:25: error: '_Size' was not declared in this scope
     struct is_array<_Tp[_Size]>
                         ^~~~~
/usr/include/c++/6/type_traits:360:31: error: template argument 1 is invalid
     struct is_array<_Tp[_Size]>
                               ^
/usr/include/c++/6/type_traits:558:37: error: 'nullptr_t' is not a member of 'std'
     struct __is_null_pointer_helper<std::nullptr_t>
                                     ^~~
/usr/include/c++/6/type_traits:558:37: error: 'nullptr_t' is not a member of 'std'
/usr/include/c++/6/type_traits:558:51: error: template argument 1 is invalid
     struct __is_null_pointer_helper<std::nullptr_t>
                                                   ^
/usr/include/c++/6/type_traits:1478:32: error: 'size_t' is not a member of 'std'
     : public integral_constant<std::size_t, __alignof__(_Tp)> { };
                                ^~~
/usr/include/c++/6/type_traits:1478:32: note: suggested alternative:
In file included from /usr/include/wchar.h:51:0,
                 from /usr/include/c++/6/cwchar:44,
                 from /usr/include/c++/6/bits/postypes.h:40,
                 from /usr/include/c++/6/iosfwd:40,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/lib/gcc/x86_64-linux-gnu/6/include/stddef.h:216:23: note:   'size_t'
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/6/bits/move.h:57:0,
                 from /usr/include/c++/6/bits/nested_exception.h:40,
                 from /usr/include/c++/6/exception:173,
                 from /usr/include/c++/6/ios:39,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/include/c++/6/type_traits:1478:32: error: 'size_t' is not a member of 'std'
     : public integral_constant<std::size_t, __alignof__(_Tp)> { };
                                ^~~
/usr/include/c++/6/type_traits:1478:32: note: suggested alternative:
In file included from /usr/include/wchar.h:51:0,
                 from /usr/include/c++/6/cwchar:44,
                 from /usr/include/c++/6/bits/postypes.h:40,
                 from /usr/include/c++/6/iosfwd:40,
                 from /usr/include/c++/6/ios:38,
                 from /usr/include/c++/6/ostream:38,
                 from /usr/include/c++/6/iostream:39,
                 from /in/foo.cc:2:
/usr/lib/gcc/x86_64-linux-gnu/6/include/stddef.h:216:23: note:   'size_t'
 typedef __SIZE_TYPE__ size_t;
                       ^~~~~~
In file included from /usr/include/c++/6/bits/move.h:57:0,
                 from /usr/include/c++/6/bits/ne