/in/foo.cc: In function 'int main()':
/in/foo.cc:9:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<strlen(s);i++)
                  ^
/in/foo.cc:11:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(cnt>=strlen(s)/2) cout<<"Yes"<<endl;
           ^
/in/foo.cc:11:11: warning: 'cnt' may be used uninitialized in this function [-Wmaybe-uninitialized]