Compilare: user.cpp: In function ‘bool is_good(long long int)’: user.cpp:61:23: warning: unused variable ‘p’ [-Wunused-variable] int i,st,dr,mid,f,p; ^ user.cpp: In function ‘void Read(int&)’: user.cpp:26:56: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz == DIM) fread(buff,1,DIM,stdin), poz=0; ^ user.cpp:32:56: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] if(++poz == DIM) fread(buff,1,DIM,stdin), poz=0; ^ user.cpp: In function ‘int main()’: user.cpp:87:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrsec.in","r",stdin); ^ user.cpp:88:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("nrsec.out","w",stdout); ^ user.cpp:93:27: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %lld",&N,&K); ^