Compilare: user.cpp: In function ‘int main()’: user.cpp:6: warning: unused variable ‘n’ user.cpp:6: warning: unused variable ‘j’ user.cpp:7: warning: unused variable ‘sel’ user.cpp:12: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:14: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result user.cpp:18: warning: ‘s’ may be used uninitialized in this function