Compilare: user.cpp: In member function ‘char InputReader<BUFFSIZE>::GetChar() [with int BUFFSIZE = 1048576]’: user.cpp:43:13: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buff, 1, BUFFSIZE, fin); ^