Compilare: user.cpp: In function ‘int read()’: user.cpp:22:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%s",c); ^ user.cpp: In function ‘int main()’: user.cpp:29:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("baruri.in","r",stdin); ^ user.cpp:30:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("baruri.out","w",stdout); ^ user.cpp:11:5: warning: ‘z’ may be used uninitialized in this function [-Wmaybe-uninitialized] for (;i<=n;i+=zero(i)) S[i]+=x; ^ user.cpp:31:26: note: ‘z’ was declared here int t=read(),m,v,x,y,z; ^