Compilare: user.cpp: In constructor ‘Reader::Reader(const int&)’: user.cpp:23:38: warning: argument to ‘sizeof’ in ‘void* memset(void*, int, size_t)’ call is the same expression as the destination; did you mean to provide an explicit length? [-Wsizeof-pointer-memaccess] memset(buffer_, 0, sizeof(buffer_)); ^ user.cpp: In member function ‘void Reader::next()’: user.cpp:46:44: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer_, 1, size_, stdin); ^ user.cpp: In constructor ‘Reader::Reader(const int&)’: user.cpp:21:43: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("mess.in", "r", stdin); ^