/in/foo.cc: In function 'int main()':
/in/foo.cc:11:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<c.size();i++)
                ^
/in/foo.cc:15:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(2*cnt>c.size())cout<<"Yes"<<endl;
           ^