Eroare de compilare in evaluator: user.cpp:2:20: error: hash_set: No such file or directory user.cpp:9: error: expected constructor, destructor, or type conversion before '<' token user.cpp: In function 'int main()': user.cpp:25: error: 'S' was not declared in this scope user.cpp:27: error: 'S' was not declared in this scope user.cpp:29: error: 'S' was not declared in this scope