Borderou de evaluare (job #446653)

Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:10:3: error: reference to ‘cin’ is ambiguous user.cpp:5:46: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:10:10: error: ‘n’ was not declared in this scope user.cpp:11:27: error: reference to ‘cin’ is ambiguous user.cpp:5:46: error: candidates are: std::ifstream cin /usr/include/c++/4.6/iostream:61:18: error: std::istream std::cin user.cpp:16:6: error: reference to ‘cout’ is ambiguous user.cpp:5:12: error: candidates are: std::ofstream cout /usr/include/c++/4.6/iostream:62:18: error: std::ostream std::cout user.cpp:19:24: error: no match for ‘operator[]’ in ‘a[b.std::vector<_Tp, _Alloc>::begin [with _Tp = int, _Alloc = std::allocator<int>, std::vector<_Tp, _Alloc>::iterator = __gnu_cxx::__normal_iterator<int*, std::vector<int> >, typename std::_Vector_base<_Tp, _Alloc>::_Tp_alloc_type::pointer = int*]()]’