Compilare: user.cpp: In function ‘int query(int, int*)’: user.cpp:7:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x-=(x&(x-1))^x) ^ user.cpp: In function ‘void update(int, int, int*)’: user.cpp:13:10: warning: statement has no effect [-Wunused-value] for(x;x<=10000;x+=(x&(x-1))^x) ^ user.cpp: In function ‘int main()’: user.cpp:18:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euro2.in","r",stdin); ^ user.cpp:19:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("euro2.out","w",stdout); ^ user.cpp:21:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:23:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d.%d",&a,&b); ^