View Compilation Error

0_0_34796169_5094.cpp: In function 'int main()':
0_0_34796169_5094.cpp:71:55: error: request for member 'id' in 'ans.std::vector<_Tp, _Alloc>::operator[]<int, std::allocator<int> >(((std::vector<int>::size_type)i))', which is of non-class type '__gnu_cxx::__alloc_traits<std::allocator<int> >::value_type {aka int}'
     for(int i=0;i<ans.size();i++)printf("%d%c",ans[i].id," \n"[i==ans.size()-1]);
                                                       ^