/in/foo.cc:21:1: error: 'queue' does not name a type
 queue<tree *> q;//用来建树，代替递归 
 ^~~~~
/in/foo.cc:22:1: error: 'queue' does not name a type
 queue<tree *> topo;//把几点打入队列用来DP，由程序知后打入的是需要先DP的； 
 ^~~~~
/in/foo.cc: In function 'void build_r(tree*&, node*)':
/in/foo.cc:53:2: error: 'q' was not declared in this scope
  q.push(T);
  ^
/in/foo.cc:54:12: error: 'r' was not declared in this scope
  build_r(T-r,p-next); 
            ^
/in/foo.cc:54:15: error: invalid operands of types 'node*' and '<unresolved overloaded function type>' to binary 'operator-'
  build_r(T-r,p-next); 
              ~^~~~~
/in/foo.cc: In function 'void build()':
/in/foo.cc:60:2: error: 'q' was not declared in this scope
  q.push(T);
  ^
/in/foo.cc:67:16: error: 'r' was not declared in this scope
   u->l->l=u->l-r=0;
                ^
/in/foo.cc:68:5: error: 'l' was not declared in this scope
   u-l>0>x=g[u->x]->v;
     ^
/in/foo.cc:68:9: error: 'x' was not declared in this scope
   u-l>0>x=g[u->x]->v;
         ^
/in/foo.cc: In function 'void topodeal(tree*)':
/in/foo.cc:77:13: error: 'r' was not declared in this scope
  topodeal(T-r);
             ^
/in/foo.cc:78:2: error: 'topo' was not declared in this scope
  topo.push(T);
  ^~~~
/in/foo.cc: In function 'void dp(tree*)':
/in/foo.cc:81:8: error: 't' was not declared in this scope
  int u=t->x;
        ^
/in/foo.cc:86:7: error: 'r' was not declared in this scope
  if(T-r){
       ^
/in/foo.cc:87:7: error: redeclaration of 'int r'
   int r=T->r->x;
       ^
/in/foo.cc:86:7: note: '<typeprefixerror>r' previously declared here
  if(T-r){
       ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:101:14: error: 'topo' was not declared in this scope
  for(tree *u=topo.front();!topo.empty();u=topo.front()) dp(u),topo.pop();
              ^~~~