/in/foo.cc: In function 'int main()':
/in/foo.cc:8:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<s.size()/2+1;i++)
                 ~^~~~~~~~~~~~~
/in/foo.cc:14:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(cnt==s.size()/2+1)
        ~~~^~~~~~~~~~~~~~
/in/foo.cc:19:1: error: expected ';' before '}' token
 }
 ^