/in/foo.cc: In function 'void dfs_1(int)':
/in/foo.cc:13:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<G[x].size();i++)if(!a[G[x][i]].dep){
                 ~^~~~~~~~~~~~
/in/foo.cc: In function 'void dfs_2(int)':
/in/foo.cc:23:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<G[x].size();i++) if(G[x][i]!=a[x].son&&!a[G[x][i]].tree) dfs_2(G[x][i]);
                 ~^~~~~~~~~~~~
/in/foo.cc: In function 'int main()':
/in/foo.cc:69:57: warning: format '%s' expects argument of type 'char*', but argument 2 has type 'char (*)[20]' [-Wformat=]
         char str[20]; int u,v; scanf("%s%d%d",&str,&u,&v);
                                                         ^

VJ4Error('ProblemDataNotFoundError', '题目 590c987dd3d8a13210993742 的数据未找到。', 'newbzoj', '590c987dd3d8a13210993742')