Eroare de compilare: main.cpp:7:13: error: variable 'std::ifstream cin' has initializer but incomplete type 7 | ifstream cin("undo2.in"); | ^ main.cpp:8:14: error: variable 'std::ofstream cout' has initializer but incomplete type 8 | ofstream cout("undo2.out"); | ^ main.cpp: In function 'int main()': main.cpp:18:5: error: reference to 'cin' is ambiguous 18 | cin >> n; | ^~~ In file included from main.cpp:1: /usr/include/c++/12.2.1/iostream:60:18: note: candidates are: 'std::istream std::cin' 60 | extern istream cin; /// Linked to standard input | ^~~ main.cpp:7:10: note: '<typeprefixerror>cin' 7 | ifstream cin("undo2.in"); | ^~~ main.cpp:23:9: error: reference to 'cin' is ambiguous 23 | cin >> op >> x; | ^~~ /usr/include/c++/12.2.1/iostream:60:18: note: candidates are: 'std::istream std::cin' 60 | extern istream cin; /// Linked to standard input | ^~~ main.cpp:7:10: note: '<typeprefixerror>cin' 7 | ifstream cin("undo2.in"); | ^~~ main.cpp:47:9: error: reference to 'cout' is ambiguous 47 | cout << upper_bound(pos[x].begin(), pos[x].end(), top) - pos[x].begin() << "\n"; | ^~~~ /usr/include/c++/12.2.1/iostream:61:18: note: candidates are: 'std::ostream std::cout' 61 | extern ostream cout; /// Linked to standard output | ^~~~ main.cpp:8:10: note: '<typeprefixerror>cout' 8 | ofstream cout("undo2.out"); | ^~~~ Non zero exit status: 1