foo.cc: In function ‘void Deep_dfs(int, int)’:
foo.cc:10:23: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   10 |         for (int i=1;i<g[x].size();i++)
      |                      ~^~~~~~~~~~~~
foo.cc: In function ‘void dfs(int)’:
foo.cc:21:39: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   21 |                         for (int i=1;i<g[ind].size();i++) g[a].push_back(g[ind][i]);
      |                                      ~^~~~~~~~~~~~~~
foo.cc:24:31: 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=1;i<g[a].size();i++) Deep_dfs(g[a][i],a);
      |                              ~^~~~~~~~~~~~
foo.cc:19:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   19 |         if (Isfind[ind])
      |            ^
foo.cc: In function ‘int main()’:
foo.cc:55:39: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   55 |                         for (int i=0;i<g[human[j]].size();i++) Humanfind[g[human[j]][i]]++;
      |                                      ~^~~~~~~~~~~~~~~~~~~