Accepted
/in/foo.cc: In function 'void dfs(int, int)': /in/foo.cc:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f[u].size();i++) ~^~~~~~~~~~~~
/in/foo.cc: In function 'void dfs(int, int)': /in/foo.cc:11:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<f[u].size();i++) ~^~~~~~~~~~~~