Compilare: user.cpp: In function ‘void update(int)’: user.cpp:8:22: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for (; x<=n; x+=x&(x-1)^x) ^ user.cpp: In function ‘int query(int)’: user.cpp:15:19: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for (; x; x-=x&(x-1)^x) ^ user.cpp: In function ‘int main()’: user.cpp:40:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("schi.in", "r", stdin); ^ user.cpp:41:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("schi.out", "w", stdout); ^ user.cpp:43:20: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.cpp:45:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &v[i]); ^