Eroare de compilare: user.cpp:11: error: reference to ‘pair’ is ambiguous user.cpp:8: error: candidates are: struct pair /usr/include/c++/4.4/bits/stl_pair.h:67: error: template<class _T1, class _T2> struct std::pair user.cpp:11: error: reference to ‘pair’ is ambiguous user.cpp:8: error: candidates are: struct pair /usr/include/c++/4.4/bits/stl_pair.h:67: error: template<class _T1, class _T2> struct std::pair user.cpp:11: error: ‘pair’ does not name a type user.cpp: In function ‘int main()’: user.cpp:17: error: ‘A’ was not declared in this scope user.cpp:23: error: ‘A’ was not declared in this scope