In file included from /in/Compile/Map_compile_check.cpp:5:0:
/in/Map.h: In instantiation of 'Value_type& Map<Key_type, Value_type, Key_compare>::operator[](const Key_type&) [with Key_type = std::__cxx11::basic_string<char>; Value_type = int; Key_compare = std::less<std::__cxx11::basic_string<char> >]':
/in/Compile/Map_compile_check.cpp:85:21:   required from here
/in/Map.h:187:28: error: 'class BinarySearchTree<std::pair<std::__cxx11::basic_string<char>, int>, Map<std::__cxx11::basic_string<char>, int>::PairComp>::Iterator' has no member named 'first'
     it = tree.insert(pair).first;  // 正确解包 tree.insert 的返回值
/in/Map.h: In instantiation of 'Value_type& Map<Key_type, Value_type, Key_compare>::operator[](const Key_type&) [with Key_type = Duck; Value_type = std::__cxx11::basic_string<char>; Key_compare = DuckWealthLess]':
/in/Compile/Map_compile_check.cpp:87:35:   required from here
/in/Map.h:187:28: error: 'class BinarySearchTree<std::pair<Duck, std::__cxx11::basic_string<char> >, Map<Duck, std::__cxx11::basic_string<char>, DuckWealthLess>::PairComp>::Iterator' has no member named 'first'
/in/Compile/Makefile:32: recipe for target 'Map_compile_check.exe' failed
make: *** [Map_compile_check.exe] Error 1