Compilare: user.cpp: In function ‘void refa()’: user.cpp:19: warning: unused variable ‘nr’ user.cpp: In function ‘int main()’: user.cpp:92: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:93: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result user.cpp:94: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:99: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result user.cpp:95: warning: ‘st1’ may be used uninitialized in this function user.cpp:95: warning: ‘dr1’ may be used uninitialized in this function