数据结构互换二叉树中所有结点的左右子树 C

╰半夏微凉° 2022-04-18 02:26 163阅读 0赞

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#include <iostream>#define NULL 0using namespace std;template<class T>struct BTNode{
          T data; BTNode<T> *lChild, *rChild; BTNode(); BTNode(const T &val, BTNode<T> *Childl = NULL, BTNode<T> *Childr = NULL) {  data = val;  lChild = Childl;  rChild = Childr; } BTNode<T>* CopyTree() {  BTNode<T> *l, *r, *n;  if(&data == NULL)  {   return NULL;  }  l = lChild->CopyTree();  r = rChild->CopyTree();  n = new BTNode<T>(data, l, r);  return n; }};template<class T>BTNode<T>::BTNode(){ lChild = rChild = NULL;}template<class T>class BinaryTree{
         public: BTNode<T> *root; BinaryTree(); ~BinaryTree(); void Pre_Order(); void In_Order(); void Post_Order(); void DestroyTree(); BTNode<T>* MakeTree(const T &element, BTNode<T> *l, BTNode<T> *r) {  root = new BTNode<T> (element, l, r);  if(root == NULL)  {   cout << "Failure for applying storage address, system will close the process." << endl;   exit(1);  }  return root; }private: void PreOrder(BTNode<T> *r); void InOrder(BTNode<T> *r); void PostOrder(BTNode<T> *r); void Destroy(BTNode<T> *&r);};template<class T>BinaryTree<T>::BinaryTree(){ root = NULL;}template<class T>BinaryTree<T>::~BinaryTree(){ DestroyTree();}template<class T>void BinaryTree<T>::Pre_Order(){ PreOrder(root);}template<class T>void BinaryTree<T>::In_Order(){ InOrder(root);}template<class T>void BinaryTree<T>::Post_Order(){ PostOrder(root);}template<class T>void BinaryTree<T>::DestroyTree(){ Destroy(root);}template<class T>void BinaryTree<T>::PreOrder(BTNode<T> *r){ if(r != NULL) {  cout << r->data << ' ';  PreOrder(r->lChild);  PreOrder(r->rChild); }}template<class T>void BinaryTree<T>::InOrder(BTNode<T> *r){ if(r != NULL) {  InOrder(r->lChild);  cout << r->data << ' ';  InOrder(r->rChild); }}template<class T>void BinaryTree<T>::PostOrder(BTNode<T> *r){ if(r != NULL) {  PostOrder(r->lChild);  PostOrder(r->rChild);  cout << r->data << ' '; }}template<class T>void BinaryTree<T>::Destroy(BTNode<T> *&r){ if(r != NULL) {  Destroy(r->lChild);  Destroy(r->rChild);  delete r;  r = NULL; }}template<class T>void Swap(BTNode<T> *r) // Swap left, right subtree of all nodes.{
          BTNode<T> *p; if(r) {  p = r->lChild;  r->lChild = r->rChild;  r->rChild = p; // Swap left, right child.  Swap(r->lChild); // Swap left, right subtree of all the nodes in left subtree.  Swap(r->rChild); // Swap left, right subtree of all the nodes in right subtree. }}void main(){ BTNode<char> *b, *c, *d, *e, *f, *g; BinaryTree<char> a; b = a.MakeTree('F', NULL, NULL); c = a.MakeTree('E', NULL, NULL); d = a.MakeTree('D', NULL, NULL); e = a.MakeTree('C', b, NULL); f = a.MakeTree('B', d, c); g = a.MakeTree('A', f, e); cout << "Pre Order: "; a.Pre_Order(); cout << endl; cout << "In Order: "; a.In_Order(); cout << endl; cout << "Post Order: "; a.Post_Order(); cout << endl; cout << endl << "------Swap left, right subtree of all nodes------" << endl << endl; Swap(a.root); cout << "Pre Order: "; a.Pre_Order(); cout << endl; cout << "In Order: "; a.In_Order(); cout << endl; cout << "Post Order: "; a.Post_Order(); cout << endl << endl;}// Output:/*Pre Order: A B D E C FIn Order: D B E A F CPost Order: D E B F C A------Swap left, right subtree of all nodes------Pre Order: A C F B E DIn Order: C F A E B DPost Order: F C E D B A*/

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![这里写图片描述][SouthEast]

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[SouthEast]: /images/20220418/22053c7e3f2f48069dff2979be7be0db.png