Compilare: user.cpp: In function ‘void rez()’: user.cpp:76: warning: use of ‘ll’ length modifier with ‘f’ type character user.cpp:76: warning: use of ‘ll’ length modifier with ‘f’ type character user.cpp: In function ‘int main()’: user.cpp:83: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result