Compilare: user.cpp: In member function ‘void AIB::update(int, int)’: user.cpp:23:13: warning: statement has no effect [-Wunused-value] for (pos; pos <= MAXN; pos += zero(pos)) ^ user.cpp: In member function ‘long long int AIB::sum(int)’: user.cpp:28:13: warning: statement has no effect [-Wunused-value] for (pos; pos > 0; pos -= zero(pos)) ^ user.cpp: In function ‘int main()’: user.cpp:46:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &m); ^ user.cpp:48:31: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", v + i); ^ user.cpp:50:44: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &q[i].l, &q[i].r); ^