/in/foo.cc: In function 'void dfs(int)':
/in/foo.cc:23:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |     for(int i=c[u];i<v[u].size();i++){
      |                    ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:55:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   55 |         for(int j=0;j<v[i].size();j++){
      |                     ~^~~~~~~~~~~~