foo.cc: In function ‘void dfs(int)’:
foo.cc:9:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
    9 |                 for (int i=0;i<g[ind].size();i++) g[a].push_back(g[ind][i]);
      |                              ~^~~~~~~~~~~~~~
foo.cc: In function ‘int main()’:
foo.cc:26:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   26 |                 for (int j=0;j<g[i].size();j++) cout<<g[i][j]<<" ";
      |                              ~^~~~~~~~~~~~