/in/foo.cc: In function 'int main()':
/in/foo.cc:8:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=1;j<=i;++j){
              ~^~~
/in/foo.cc:10:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(now<maxus){
         ~~~^~~~~~
/in/foo.cc:18:18: warning: 'now' may be used uninitialized in this function [-Wmaybe-uninitialized]
  printf("%u",now);
                  ^