/in/foo.cc: In function 'int main()':
/in/foo.cc:12:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<b.length();i++)
                ^
/in/foo.cc:17:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(count*2>=b.length())
             ^