Compilare: user.cpp: In function ‘int get()’: user.cpp:13:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] #define nxtt if(++ps==maxb) fread(buff,1,maxb,stdin),ps=0; ^ user.cpp:28:41: note: in expansion of macro ‘nxtt’ while(buff[ps]<'0' || buff[ps]>'9') nxtt; ^ user.cpp:13:58: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] #define nxtt if(++ps==maxb) fread(buff,1,maxb,stdin),ps=0; ^ user.cpp:32:9: note: in expansion of macro ‘nxtt’ nxtt; ^ user.cpp: In function ‘int main()’: user.cpp:154:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("riremito.in","r",stdin); ^ user.cpp:155:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("riremito.out","w",stdout); ^ user.cpp: In function ‘void det()’: user.cpp:130:44: warning: ‘nxt’ may be used uninitialized in this function [-Wmaybe-uninitialized] for(unsigned int i=0;i<l[nxt].size();i++) ^