Eroare de compilare: main.cpp:2:17: error: 'stf' is not a namespace-name 2 | using namespace stf; | ^~~ main.cpp: In function 'int main()': main.cpp:6:1: error: 'cin' was not declared in this scope; did you mean 'std::cin'? 6 | cin >> a >> b; | ^~~ | std::cin In file included from main.cpp:1: /usr/include/c++/10/iostream:60:18: note: 'std::cin' declared here 60 | extern istream cin; /// Linked to standard input | ^~~ main.cpp:7:1: error: 'cout' was not declared in this scope; did you mean 'std::cout'? 7 | cout << a+b; | ^~~~ | std::cout In file included from main.cpp:1: /usr/include/c++/10/iostream:61:18: note: 'std::cout' declared here 61 | extern ostream cout; /// Linked to standard output | ^~~~ main.cpp:9:1: error: expected primary-expression before ')' token 9 | ) | ^ main.cpp:9:1: error: expected '}' at end of input main.cpp:4:1: note: to match this '{' 4 | { | ^ Non zero exit status: 1