/in/foo.cc: In function 'int main()':
/in/foo.cc:16:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while((p=s.find(a,p+1))!=string::npos) cnt++;
                          ^
/in/foo.cc:17:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if(cnt*2 >= s.length()) cout << "Yes\n";
            ^