/in/foo.cc: In function 'int main()':
/in/foo.cc:8:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0;i<strlen(s);i++){
                 ^
/in/foo.cc:11:12: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   if (cnt*2>=strlen(s)) cout<<"Yes\n";
            ^