Compilare: user.cpp: In function ‘void scan(long long int&)’: user.cpp:18:31: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] while( '0' <= buffer[poz] && buffer[poz] <= '9' || buffer[poz] == '-') ^ user.cpp:17:59: 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(buffer,1,DIM,stdin),poz = 0; ^ user.cpp:25:46: warning: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] fread(buffer,1,DIM,stdin),poz = 0; ^ user.cpp: In function ‘int main()’: user.cpp:104:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lazy.in","r",stdin); ^ user.cpp:105:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("lazy.out","w",stdout); ^