View Compilation Error

0_0_16686102_9862.cpp
0_0_16686102_9862.cpp(18) : error C2661: “std::set<std::string,std::less<_Kty>,std::allocator<_Kty>>::insert”: 没有重载函数接受 0 个参数
        with
        [
            _Kty=std::string
        ]
0_0_16686102_9862.cpp(22) : error C3867: “std::_Tree<std::_Tset_traits<_Kty,_Pr,_Alloc,false>>::clear”:  函数调用缺少参数列表；请使用“&std::_Tree<std::_Tset_traits<_Kty,_Pr,_Alloc,false>>::clear”创建指向成员的指针
        with
        [
            _Kty=std::string
,            _Pr=std::less<std::string>
,            _Alloc=std::allocator<std::string>
        ]