Compilare: user.cpp:2:0: warning: ignoring #pragma optimise [-Wunknown-pragmas] #pragma optimise("Ofast") user.cpp: In constructor ‘InputReader::InputReader(const char*)’: user.cpp:11:47: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^ user.cpp: In member function ‘void InputReader::advance()’: user.cpp:33:51: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer, SIZE, 1, input_file); ^