Compilare: user.cpp: In function ‘int query(int, int, int)’: user.cpp:54:6: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if (mid + 1 <= y) ^ user.cpp: In function ‘void next_char(FILE*)’: 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); ^ user.cpp: In function ‘int main()’: user.cpp:78:38: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d", &n, &b, &p); ^