foo.cc: In function ‘void Deep_dfs(int, int)’:
foo.cc:9:23: 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=1;i<g[x].size();i++)
      |                      ~^~~~~~~~~~~~
foo.cc: In function ‘void dfs(int)’:
foo.cc:25:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   25 |                 for (int i=1;i<g[ind].size();i++) g[a].push_back(g[ind][i]);
      |                              ~^~~~~~~~~~~~~~
foo.cc: In function ‘int main()’:
foo.cc:57:39: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   57 |                         for (int i=0;i<g[human[j]].size();i++) Humanfind[g[human[j]][i]]++;
      |                                      ~^~~~~~~~~~~~~~~~~~~
foo.cc:51:21: warning: variable ‘ok’ set but not used [-Wunused-but-set-variable]
   51 |                 int ok=1;
      |                     ^~