Compilare: main.cpp: In function 'int get_int()': main.cpp:11:59: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] #define NXT if(++pos==maxb) fread(buff,1,maxb,stdin),pos=0; ^ main.cpp:22:43: note: in expansion of macro 'NXT' while(buff[pos]<'0' || buff[pos]>'9') NXT ^~~ main.cpp:11:59: warning: ignoring return value of 'size_t fread(void*, size_t, size_t, FILE*)', declared with attribute warn_unused_result [-Wunused-result] #define NXT if(++pos==maxb) fread(buff,1,maxb,stdin),pos=0; ^ main.cpp:24:33: note: in expansion of macro 'NXT' nr=nr*10+buff[pos]-'0'; NXT ^~~ main.cpp: In function 'int main()': main.cpp:106:33: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mine.in","r",stdin); ^ main.cpp:107:35: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result] freopen("mine.out","w",stdout); ^