Compilare: user.cpp: In function ‘void update(int)’: user.cpp:10:10: warning: statement has no effect [-Wunused-value] for(x;x<=n;x=x+((x&(x-1))^x)) ^ user.cpp: In function ‘int query(int)’: user.cpp:15:10: warning: statement has no effect [-Wunused-value] for(x;x>0;x=x-((x&(x-1))^x)) ^ user.cpp: In function ‘int main()’: user.cpp:20:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc4.in","r",stdin); ^ user.cpp:21:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cerc4.out","w",stdout); ^ user.cpp:23:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&m); ^ user.cpp:25:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&v[i].first,&v[i].second); ^