/in/foo.cc: In member function 'dts::ubigint dts::ubigint::mov(dts::ll)':
/in/foo.cc:58:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      for (ll i=0;i<num.size();i++)
                  ~^~~~~~~~~~~
/in/foo.cc: In member function 'void dts::ubigint::save(char*, dts::ll)':
/in/foo.cc:281:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for (ull i=0;i<size;i++)
                  ~^~~~~
/in/foo.cc: In function 'void dts::bfs()':
/in/foo.cc:348:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (ll i=0;i<e[now].size();i++)
                ~^~~~~~~~~~~~~~