Eroare de compilare: user.cpp:5:19: error: vector.h: No such file or directory user.cpp:12: error: expected constructor, destructor, or type conversion before ‘<’ token user.cpp: In function ‘int main()’: user.cpp:30: error: ‘a’ was not declared in this scope user.cpp:42: error: ‘a’ was not declared in this scope user.cpp:62: error: ‘a’ was not declared in this scope