/in/foo.cc: In function 'int jud(std::__cxx11::string, std::__cxx11::string)':
/in/foo.cc:33:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(l1<l.length())
        ~~^~~~~~~~~~~
/in/foo.cc:38:10: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  while(l2<r.length())
        ~~^~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:73:8: warning: unused variable 'test' [-Wunused-variable]
    int test=1;
        ^~~~
/in/foo.cc:87:14: warning: array subscript has type 'char' [-Wchar-subscripts]
     if(vis[ci])
              ^
/in/foo.cc:103:11: warning: array subscript has type 'char' [-Wchar-subscripts]
     vis[ci]=1;
           ^
/in/foo.cc:113:14: warning: array subscript has type 'char' [-Wchar-subscripts]
     vis[nd.ch]=0;
              ^