Compilare: main.cpp: In constructor 'InputReader::InputReader(const char*)': main.cpp:31:35: 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, in); ^ main.cpp: In member function 'void InputReader::advance()': main.cpp:54:39: 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, in); ^