foo.cc: In function 'void dfs(long long int)':
foo.cc:21:15: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   21 |  for(int i=0;i<G[x].size();++i){
      |              ~^~~~~~~~~~~~
foo.cc: In function 'int main()':
foo.cc:54:16: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   54 |   for(int j=0;j<G[i].size();++j){
      |               ~^~~~~~~~~~~~

正在同步测试数据，请稍后
[Hydro](https://hydro.ac)提供评测服务