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:20:39: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   20 |                         for (int i=1;i<g[ind].size();i++) g[a].push_back(g[ind][i]);
      |                                      ~^~~~~~~~~~~~~~
foo.cc:23:31: warning: comparison of integer expressions of different signedness: ‘int’ and ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} [-Wsign-compare]
   23 |                 for (int i=1;i<g[a].size();i++) Deep_dfs(g[a][i],a);
      |                              ~^~~~~~~~~~~~
foo.cc:18:12: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wdangling-else]
   18 |         if (Isfind[ind])
      |            ^
foo.cc: In function ‘int main()’:
foo.cc:65:47: warning: comparison of integer expressions of different signedness: ‘std::vector<int>::size_type’ {aka ‘long unsigned int’} and ‘int’ [-Wsign-compare]
   65 |                         if (g[human[j]].size()<minn)
      |                             ~~~~~~~~~~~~~~~~~~^~~~~