/in/foo.cc: In function 'int JudgeFamily(std::vector<int>&)':
/in/foo.cc:9:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(i=0;i<numbers.size();i++)
          ~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'void CountNumberOfFamily(std::vector<int>&, int&)':
/in/foo.cc:32:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<numbers.size();i++)
           ~^~~~~~~~~~~~~~~
/in/foo.cc:41:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(i=0;i<numbers.size();i++)
           ~^~~~~~~~~~~~~~~
/in/foo.cc:46:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(i<numbers.size() && number_2!=1)
         ~^~~~~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:60:13: warning: unused variable 'family' [-Wunused-variable]
  int number,family,count=0;
             ^~~~~~