Eroare de compilare: user.cpp: In function ‘int pa(int)’: user.cpp:28: warning: comparison between signed and unsigned integer expressions user.cpp:72: warning: no return statement in function returning non-void user.cpp: In function ‘int main()’: user.cpp:77: error: ‘stdin’ was not declared in this scope user.cpp:77: error: ‘freopen’ was not declared in this scope user.cpp:78: error: ‘stdout’ was not declared in this scope user.cpp:80: error: ‘scanf’ was not declared in this scope user.cpp:100: error: ‘printf’ was not declared in this scope