Eroare de compilare: user.cpp: In function ‘int main()’: user.cpp:18:25: error: reference to ‘hash’ is ambiguous if (op == 1 && hash.find(x) == hash.end()) hash[x] = 1; ^ user.cpp:10:15: note: candidates are: std::map<int, int> hash map <int,int> hash; ^ In file included from /usr/include/c++/4.8/bits/basic_string.h:3033:0, from /usr/include/c++/4.8/string:52, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash struct hash; ^ user.cpp:18:41: error: reference to ‘hash’ is ambiguous if (op == 1 && hash.find(x) == hash.end()) hash[x] = 1; ^ user.cpp:10:15: note: candidates are: std::map<int, int> hash map <int,int> hash; ^ In file included from /usr/include/c++/4.8/bits/basic_string.h:3033:0, from /usr/include/c++/4.8/string:52, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash struct hash; ^ user.cpp:18:53: error: reference to ‘hash’ is ambiguous if (op == 1 && hash.find(x) == hash.end()) hash[x] = 1; ^ user.cpp:10:15: note: candidates are: std::map<int, int> hash map <int,int> hash; ^ In file included from /usr/include/c++/4.8/bits/basic_string.h:3033:0, from /usr/include/c++/4.8/string:52, from /usr/include/c++/4.8/bits/locale_classes.h:40, from /usr/include/c++/4.8/bits/ios_base.h:41, from /usr/include/c++/4.8/ios:42, from /usr/include/c++/4.8/ostream:38, from /usr/include/c++/4.8/iostream:39, from user.cpp:1: /usr/include/c++/4.8/bits/functional_hash.h:58:12: note: template<class _Tp> struct std::hash