/in/foo.cc: In function 'void bfs(int)':
/in/foo.cc:35:6: warning: unused variable 'newNode' [-Wunused-variable]
  int newNode;
      ^~~~~~~
/in/foo.cc: In function 'std::vector<int> lcaRoute(int, int)':
/in/foo.cc:66:7: warning: unused variable 'isSuccess' [-Wunused-variable]
  bool isSuccess = false;
       ^~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:142:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i = 0 ; i < route.size() ; i++)
                    ~~^~~~~~~~~~~~~~