Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:61:13: warning: statement has no effect [-Wunused-value] for (pos; pos <= NMAX; pos += lsb (pos)) { ^ user.cpp: In function ‘int query(int)’: user.cpp:69:13: warning: statement has no effect [-Wunused-value] for (pos; pos > 0; pos -= lsb (pos)) { ^