/in/foo.cc: In function 'int rd()':
/in/foo.cc:9:2: warning: this 'while' clause does not guard... [-Wmisleading-indentation]
  while(isdigit(c))x=x*10+c-48,c=getchar();return x;
  ^~~~~
/in/foo.cc:9:43: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'while'
  while(isdigit(c))x=x*10+c-48,c=getchar();return x;
                                           ^~~~~~
/in/foo.cc: In function 'void sol()':
/in/foo.cc:14:2: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  for(int i=1;i<=n;i++)e[i]=0,g[i].clear();S.clear();
  ^~~
/in/foo.cc:14:43: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the 'for'
  for(int i=1;i<=n;i++)e[i]=0,g[i].clear();S.clear();
                                           ^
/in/foo.cc:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<g[x].size();i++)
               ~^~~~~~~~~~~~
/in/foo.cc:33:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<g[x].size();i++)
               ~^~~~~~~~~~~~
/in/foo.cc:48:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for(int j=0;j<g[x].size();j++)if(vis[g[x][j]]){f=0;break;}
                ~^~~~~~~~~~~~
/in/foo.cc:53:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  printf("%d ",(int)A.size());for(int i=0;i<A.size();i++)printf("%d ",A[i]);puts("");
                                          ~^~~~~~~~~
/in/foo.cc:54:43: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  printf("%d ",(int)B.size());for(int i=0;i<B.size();i++)printf("%d ",B[i]);puts("");
                                          ~^~~~~~~~~