Compilare: user.cpp: In function ‘void update(int, int)’: user.cpp:14:14: warning: statement has no effect [-Wunused-value] for(x;x<=n;x+=lsb(x)) sum[x]+=val; ^ user.cpp: In function ‘int query(int)’: user.cpp:20:10: warning: statement has no effect [-Wunused-value] for(x;x>=1;x-=lsb(x)) rez+=sum[x]; ^ user.cpp: In function ‘int main()’: user.cpp:26:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("costperm.in","r",stdin); ^ user.cpp:27:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("costperm.out","w",stdout); ^ user.cpp:28:19: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:30:30: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x),v[x]=i; ^