View Compilation Error

0_0_16939961_11929.cpp
0_0_16939961_11929.cpp(52) : error C2872: “next”: 不明确的符号
        可能是“0_0_16939961_11929.cpp(16) : std::set<int,std::less<_Kty>,std::allocator<_Kty>> next”
        with
        [
            _Kty=int
        ]
        或       “VC2013\INCLUDE\xutility(771) : _FwdIt std::next(_FwdIt,iterator_traits<_Iter>::difference_type)”
0_0_16939961_11929.cpp(84) : error C2872: “next”: 不明确的符号
        可能是“0_0_16939961_11929.cpp(16) : std::set<int,std::less<_Kty>,std::allocator<_Kty>> next”
        with
        [
            _Kty=int
        ]
        或       “VC2013\INCLUDE\xutility(771) : _FwdIt std::next(_FwdIt,iterator_traits<_Iter>::difference_type)”
0_0_16939961_11929.cpp(86) : error C2872: “next”: 不明确的符号
        可能是“0_0_16939961_11929.cpp(16) : std::set<int,std::less<_Kty>,std::allocator<_Kty>> next”
        with
        [
            _Kty=int
        ]
        或       “VC2013\INCLUDE\xutility(771) : _FwdIt std::next(_FwdIt,iterator_traits<_Iter>::difference_type)”