/in/foo.cc: In function 'int main()':
/in/foo.cc:11:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         for(int i=0;i<strlen(s2);i++)
                      ^
/in/foo.cc:13:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(cnt>=((strlen(s2)+1)/2))cout << "Yes" << endl;
               ^