/in/foo.cc: In function 'int main()':
/in/foo.cc:8:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<strlen(s);i++){
                ^
/in/foo.cc:11:13: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if(cnt>=strlen(s)/2)cout<<"Yes"<<endl;
             ^
/in/foo.cc:12:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
          else if(cnt<strlen(s)/2) cout<<"No"<<endl;
                     ^