Eroare de compilare: user.cpp:2:20: error: hash_set: No such file or directory user.cpp:8: error: expected constructor, destructor, or type conversion before '<' token user.cpp: In function 'int main()': user.cpp:14: error: 'H' was not declared in this scope user.cpp:16: error: 'H' was not declared in this scope user.cpp:18: error: 'H' was not declared in this scope