Eroare de compilare: user.cpp:5: error: expected constructor, destructor, or type conversion before ‘int’ user.cpp: In function ‘int valid(int)’: user.cpp:20: error: ‘st’ was not declared in this scope user.cpp: In function ‘void back(int)’: user.cpp:25: error: ‘aux’ was not declared in this scope user.cpp:26: error: ‘st’ was not declared in this scope user.cpp:28: error: ‘k’ was not declared in this scope user.cpp:29: error: ‘contor’ was not declared in this scope user.cpp: In function ‘int main()’: user.cpp:36: error: ‘n’ was not declared in this scope user.cpp:37: error: ‘m’ was not declared in this scope user.cpp:39: error: ‘aux’ was not declared in this scope user.cpp:40: error: ‘aux’ was not declared in this scope user.cpp:41: error: ‘k’ was not declared in this scope user.cpp:42: error: ‘q’ was not declared in this scope user.cpp:44: error: ‘x’ was not declared in this scope user.cpp:44: error: ‘y’ was not declared in this scope user.cpp:46: error: ‘contor’ was not declared in this scope user.cpp:47: error: ‘system’ was not declared in this scope