Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:18:43: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for(;poz <= n; poz += poz ^ (poz - 1) & poz) ^ user.cpp: In function ‘int query(int)’: user.cpp:25:39: warning: suggest parentheses around arithmetic in operand of ‘^’ [-Wparentheses] for(; poz; poz -= poz ^ (poz - 1) & poz) ^ user.cpp: In function ‘int main()’: user.cpp:41:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qxy.in","r",stdin); ^ user.cpp:42:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("qxy.out","w",stdout); ^ user.cpp:44:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:47:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&val); ^ user.cpp:50:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&m); ^ user.cpp:53:54: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d",&v[i].x,&v[i].y,&a[i],&b[i]); ^