Compilare: user.cpp: In function ‘void update(int)’: user.cpp:13:15: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] x += x&(x-1)^x; ^ user.cpp: In function ‘int query(int)’: user.cpp:24:15: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] x -= x&(x-1)^x; ^ user.cpp: In function ‘int main()’: user.cpp:53:11: warning: variable ‘fin’ set but not used [-Wunused-but-set-variable] FILE *fin,*fout; ^ user.cpp:53:16: warning: variable ‘fout’ set but not used [-Wunused-but-set-variable] FILE *fin,*fout; ^ user.cpp:57:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:60:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^