1 #define maxn 1000000
 2 
 3 using namespace std;
 4 
 5 struct Node
 6 {
 7     Node *left,*right;
 8 };
 9 
10 queue<Node*> freenodes;
11 Node node[maxn];
12 
13 void init()
14 {
15     for(int i = 0;i < maxn;i ++)
16     {
17         freenodes.push(&node[i]);
18     }
19
 
 }
20 
21 Node *newnode()
22 {
23     Node *u = freenodes.front();
24     u->left = u->right = NULL;
25     freenodes.pop();
26     return u;
27 }
28 
29 void deletenode(Node* u)
30 {
31     freenodes.push(u);
32 }

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