Compilare: user.cpp: In function ‘bool Ok(int, int, int)’: user.cpp:87:8: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (from < to) ^ user.cpp: In function ‘char Advance()’: user.cpp:23:38: 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, stdin); ^