/in/foo.cc: In function 'int main()':
/in/foo.cc:29:10: warning: 'root' may be used uninitialized in this function [-Wmaybe-uninitialized]
    cout<<root<<endl<<maxroot<<endl;  
          ^~~~
/in/foo.cc:29:22: warning: 'maxroot' may be used uninitialized in this function [-Wmaybe-uninitialized]
    cout<<root<<endl<<maxroot<<endl;  
                      ^~~~~~~