/in/foo.cc: In function 'void dfs(int, int, int)':
/in/foo.cc:52:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   52 |     for (int i=0;i<g[x].size();i++) {
      |                  ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:109:9: warning: variable 'pos' set but not used [-Wunused-but-set-variable]
  109 |     int pos=0;
      |         ^~~