Compilare: user.cpp: In function ‘int lbit(int)’: user.cpp:7:20: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] return (x^(x-1)&x); ^ user.cpp: In function ‘void update(int, int)’: user.cpp:11:10: warning: statement has no effect [-Wunused-value] for(x;x<=n;x+=lbit(x)) ^ user.cpp: In function ‘int compute(int)’: user.cpp:17:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x-=lbit(x)) ^