Eroare de compilare: user.cpp:115:2: warning: no newline at end of file user.cpp:1: error: expected constructor, destructor, or type conversion before '<' token user.cpp: In function 'void add(int)': user.cpp:36: error: 'next_el' was not declared in this scope user.cpp: In function 'int main()': user.cpp:78: error: 'stdin' was not declared in this scope user.cpp:78: error: 'freopen' was not declared in this scope user.cpp:80: error: 'stdout' was not declared in this scope user.cpp:86: error: 'scanf' was not declared in this scope user.cpp:95: error: 'printf' was not declared in this scope user.cpp:99: error: 'printf' was not declared in this scope user.cpp:103: error: 'printf' was not declared in this scope user.cpp:112: error: 'printf' was not declared in this scope