Compilare: user.cpp:38:32: warning: suggest parentheses around ‘-’ inside ‘<<’ [-Wparentheses] static const int Hsize = 1 << 14 - 1; ^ user.cpp: In function ‘char next()’: user.cpp:15:41: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buf, 1, BUF, fin), pos = 0; ^