Compilare: user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:16:33: 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, SZ, in); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:43:37: 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, SZ, in); ^