Compilare: user.cpp: In member function ‘Buffer& Buffer::operator>>(long int&)’: user.cpp:29:18: warning: variable ‘sgn’ set but not used [-Wunused-but-set-variable] long sgn=1; ans=0; ^ user.cpp: In function ‘int main()’: user.cpp:71:38: warning: deprecated conversion from string constant to ‘char*’ [-Wwrite-strings] Buffer fin("hotdogs.in",1024*1024); ^ user.cpp:72:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("hotdogs.out","w",stdout); ^ user.cpp: In constructor ‘Buffer::Buffer(char*, long int)’: user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen(name,"r",stdin); ^ user.cpp: In member function ‘void Buffer::reLoad()’: user.cpp:12:37: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(&C[0],1,dim,stdin); ^