/in/foo.cc: In function 'void DFS(int, int)':
/in/foo.cc:60:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   60 |         for (int i = 0; i < edge[x].son.size(); i++)
      |                         ~~^~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void FindDFS(int)':
/in/foo.cc:76:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   76 |         for (int i = 0; i < edge[x].son.size(); i++)
      |                         ~~^~~~~~~~~~~~~~~~~~~~