foo.cc: In function 'void dfs(int, int)':
foo.cc:17:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int j=0;j<disl[i].size();j++){
              ~^~~~~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:72:7: warning: init-statement in selection statements only available with -std=c++1z or -std=gnu++1z
    if(max(ma[i][0],ma[i][1]==17695783-17473898)cout<<-1;
       ^~~
foo.cc:72:47: error: no matching function for call to 'max(long long int&, bool)'
    if(max(ma[i][0],ma[i][1]==17695783-17473898)cout<<-1;
                                               ^
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_algobase.h:219:5: note: candidate: template<class _Tp> const _Tp& std::max(const _Tp&, const _Tp&)
     max(const _Tp& __a, const _Tp& __b)
     ^~~
/usr/include/c++/7/bits/stl_algobase.h:219:5: note:   template argument deduction/substitution failed:
foo.cc:72:47: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'bool')
    if(max(ma[i][0],ma[i][1]==17695783-17473898)cout<<-1;
                                               ^
In file included from /usr/include/c++/7/bits/char_traits.h:39:0,
                 from /usr/include/c++/7/ios:40,
                 from /usr/include/c++/7/ostream:38,
                 from /usr/include/c++/7/iostream:39,
                 from foo.cc:1:
/usr/include/c++/7/bits/stl_algobase.h:265:5: note: candidate: template<class _Tp, class _Compare> const _Tp& std::max(const _Tp&, const _Tp&, _Compare)
     max(const _Tp& __a, const _Tp& __b, _Compare __comp)
     ^~~
/usr/include/c++/7/bits/stl_algobase.h:265:5: note:   template argument deduction/substitution failed:
foo.cc:72:47: note:   deduced conflicting types for parameter 'const _Tp' ('long long int' and 'bool')
    if(max(ma[i][0],ma[i][1]==17695783-17473898)cout<<-1;
                                               ^
foo.cc:73:3: error: expected primary-expression before '}' token
   }
   ^
foo.cc:73:3: error: expected ')' before '}' token
foo.cc:73:3: error: expected primary-expression before '}' token
foo.cc:63:12: warning: unused variable 'vv' [-Wunused-variable]
  long long vv=0;
            ^~

自豪的采用HydroJudge(https://github.com/hydro-dev/Hydro)进行评测。