foo.cc: In function 'void Create_Tree(int)':
foo.cc:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |  for (int i = 0; i < v[root].size(); i++)
      |                  ~~^~~~~~~~~~~~~~~~
foo.cc: In function 'void dfs(int)':
foo.cc:37:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   37 |    for (int j = 0; j < t[i].size(); j++)
      |                    ~~^~~~~~~~~~~~~

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