Compilare: user.cpp: In function ‘void Update(int, int)’: user.cpp:27:15: warning: statement has no effect [-Wunused-value] for (index; index > 0; index -= (index & -index)) ^ user.cpp: In function ‘int Query(int)’: user.cpp:33:15: warning: statement has no effect [-Wunused-value] for (index; index <= n; index += (index & -index)) ^