Accepted
foo.cc: In function 'void dfs(int)': foo.cc:15:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 15 | for(int i=0; i<f[u].size(); i++) | ~^~~~~~~~~~~~
Found 10 testcases. [Hydro](https://hydro.ac)提供评测服务