Compilare: user.cpp: In function ‘int query(Node*, int, int)’: user.cpp:65:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (x <= mid) ^ user.cpp:70:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (mid + 1 <= y) ^ user.cpp: In function ‘void next_char()’: user.cpp:13:35: 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, BUFF_SIZE, fin); ^