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:57:25: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &n); ^ user.cpp:60:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin,"%d", &v[i]); ^