foo.cc: In function ‘int main()’:
foo.cc:21:32: warning: comparison of integer expressions of different signedness: ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} and ‘int’ [-Wsign-compare]
   21 |                 if (g[i].size()>comp) maxx=i,comp=max(comp,k);
      |                     ~~~~~~~~~~~^~~~~
foo.cc:24:23: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   24 |         for (int i=0;i<g[maxx].size();i++) cout<<g[maxx][i]<<" ";
      |                      ~^~~~~~~~~~~~~~~