Pre-order,in-order, post-order of Tree Traversal

最新推荐文章于 2024-10-23 20:38:55 发布

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本文详细介绍了C++中二叉树的数据结构实现，并提供了包括添加节点、层次遍历、中序遍历、后序遍历、前序遍历在内的多种操作方法。

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// Node class
class Node {
    string key;
    Node* left;
    Node* right;
public:
    Node() { key=-1; left=NULL; right=NULL; };
    void setKey(string aKey) { key = aKey; };
    void setLeft(Node* aLeft) { left = aLeft; };
    void setRight(Node* aRight) { right = aRight; };
    string Key() { return key; };
    Node* Left() { return left; };
    Node* Right() { return right; };
};

// Tree class
class Tree {
     Node* root;
public:
     Tree();
     ~Tree();
     Node* Root() { return root; };
     void addNode(string key);
     void levelOrder(Node* n);
     void Inorder(Node* );
    void Postorder(Node* );
    void Preorder(Node* node);
private:
     void addNode(string key, Node* leaf);
     void freeNode(Node* leaf);
};

void Tree::Tree()
{
     root = null;
}

void Tree::~Tree()
{
    freeNode(root);
}

// Add a node (private)</cite>
void Tree::addNode(string key, Node* leaf) {
    if( key <= leaf->Key() ) {
       if( leaf->Left() != NULL )
      addNode(key, leaf->Left());
       else {
      Node* n =new Node();
      n->setKey(key);
      leaf->setLeft(n);
       }
    }
    else{
       if( leaf->Right() != NULL )
      addNode(key, leaf->Right());
       else</var> {
      Node* n = new</var> Node();
      n->setKey(key);
      leaf->setRight(n);
       }
    }
}

void Tree::freeNode(Node* leaf)
{
      if(leaf != NULL)
       {
           freeNode(leaf->left());
           freeNode(leaf->right());
           delete leaf;    
       }
}

void Tree::addNode(string key)
{
   if(root == NULL){
    cout << "add root node"<<key<<endl;
    Node * n = new Node();
    n->setKey(key);
    root = n;
  }else{
   count<< "add other node"<<key <<endl;
    addNode(key, root);
  }
}

void Tree::preorder(Tree* root)
{
    if(root){
      cout<<"node->key()"<<endl;
      preorder(root->left);
       preorder(root->right);
     }
}

void Tree::postorder(Tree * root)
{
  if(root){
      postorder(root->left());
      postorder(root->right());
     cout<<root->key()<<endl;
  }
}

void Tree::leverTravesal(Tree *root)
{
    if(root){
     Queue <Node*> v;  
     v.push(root);
     while(! q.empty()){
       n = v.front()
       cout<< n->Key() <<endl;
       if(n->left() != null)
          v.push(n->left());
       if(n->rithg != null)
          v.push(n->right());
      v.pop();     
  }
  } 
}

http://www-h.eng.cam.ac.uk/help/tpl/talks/C++graphs.html

http://www.cplusplus.com/forum/beginner/131457/