/*Binary Search Tree 节点查找操作*/
Status SearchBST(BinaryTree btree, int key, BinaryTree &f, BinaryTree &p) {
if (!btree)
{
p = f;//指针回溯
return ERROR;
}
else
{
if (btree->key == key)
{
p = btree;
return OK;
}
else if (btree->key > key)
{
return SearchBST(btree->lchild, key, btree, p);//要有返回值，递归
}
else
{
return SearchBST(btree->rchild, key, btree, p);//要有返回值，递归
}
//return OK;
}
}
/*主函数*/
int main() {
int n;
int data;
int key;
BinaryTree btree = NULL;
BinaryTree f = NULL, p = NULL;
scanf("%d", &n);
//btree = (BinaryTree)malloc(sizeof(BinaryTree)*n);
for (int i = 1; i <= n; i++)
{
scanf("%d", &data);
InsertBST(btree, data);
}
preOrder(btree, printNode);//前序遍历递归实现
printf("\n");
InOrder(btree, printNode);//中序遍历递归实现
printf("\n");
PostOrder(btree, printNode);//后序遍历递归实现
printf("\n");
scanf("%d", &key);
printf("%d\n", SearchBST(btree, key, f, p));//查找操作
scanf("%d", &key);
printf("%d\n", SearchBST(btree, key, f, p));//查找操作
scanf("%d", &data);
InsertBST(btree, data);
preOrder(btree, printNode);//前序遍历递归实现
printf("\n");
InOrder(btree, printNode);//中序遍历递归实现
printf("\n");
PostOrder(btree, printNode);//后序遍历递归实现
printf("\n");
InOrderSecond(btree);//中序遍历非递归实现
LevelOrder(btree);//层次遍历
return 0;
}
BSTNode *SearchBST(BSTNode *bt,KeyType k)
{
if (bt==NULL || bt->key==k) /*递归终结条件*/
return bt;
if (k<bt->key)
return SearchBST(bt->lchild,k); /*在左子树中递归查找*/
else
return SearchBST(bt->rchild,k); /*在右子树中递归查找*/
}
BSTree SearchBST(BSTree T, ElemType *e)
{
if (T == NULL || T->data == *e){
return T;
} else if (*e < T->data){
return SearchBST(T->lchild, e);
} else {
return SearchBST(T->rchild, e);
}
}
Status SearchBST(BiTree T,int key,BiTree f,BiTree *p){
if(!T){
*p=f;
return FALSE;
}
else if(key==T->data){
*p=T;
return TRUE;
}
else if(key<T->data)return SearchBST(T->lchild,key,T,p);
else return SearchBST(T->right,key,T,p);
}
Status SearchBST(BiTree T, KeyType key, BiTree f, BiTree &p) {
// 算法9.5(b)
// 在根指针T所指二叉排序树中递归地查找其关键字等于key的数据元素，
// 若查找成功，则指针p指向该数据元素结点，并返回TRUE，
// 否则指针p指向查找路径上访问的最后一个结点并返回FALSE，
// 指针f指向T的双亲，其初始调用值为NULL
if (!T) { p = f; return FALSE; } // 查找不成功
else if (EQ(key, T->data.key)) { p = T; return TRUE; } // 查找成功
else if (LT(key, T->data.key))
return SearchBST(T->lchild, key, T, p); // 在左子树中继续查找
else
return SearchBST(T->rchild, key, T, p); // 在右子树中继续查找
} // SearchBST
BSTree *SearchBST(BSTree* t, int key)
{
if (!t || t->data == key)
{
return t;
}
else if (key < t->data)
{
return SearchBST(t->left, key);
}
else
{
return SearchBST(t->right, key);
}
}
//二叉排序树：左子树上所有结点的值均小于它的根节点的值，右子树上所有结点的值均大于根节点的值
//查找
Status SearchBST(BiTree T,KeyType key,BiTree f,BiTree &p)
//在二叉排序树T中查找key。若查找成功，则p指向该数据元素结点，并返回TRUE。否则，p指向查找路径上访问的最后一个结点并返回FALSE。f为T节点的双亲。
{
if(!T)
{
p=f;
return FALSE;
}
else if (EQ(key,T->data.key))
{
p=T;
return T;
}
else if(LT(key,T->data.key))return SearchBST(T->lchild,key,T,p);
else return SearchBST(T->rchild,key,T,p);
}
void test1()
{
int data[] = {35, 6, 15, 65, 7, 46, 17, 43, 3, 7};
// int data[] = {3};
int size = sizeof(data)/sizeof(*data);
// printf("size = %d\n", size);
BSTree BST = NULL;
BuildBSTree(BST, data, 0, size - 1);
PreOrderTraverse(BST);
printf("\n");
MidOrderTraverse(BST);
printf("\n");
PostOrderTraverse(BST);
printf("\n");
BSTree node = SearchBST(BST, 17, 0);
if (!node)
printf("Search failed.\n");
else
printf("Search success, the search value is %d.\n", node->value);
int n;
scanf("%d", &n);
while (n != -1)
{
DeleteNode(BST, n);
// printf("Delete node %d.\n", n);
MidOrderTraverse(BST);
printf("\n");
scanf("%d", &n);
}
printf("\n");
}
void main()
{
BiTree dt, p;
int i;
KeyType j;
ElemType r[N] = { {45,1},{12,2},{53,3},{3,4},{37,5},{24,6},{100,7},{61,8},{90,9},{78,10} }; /* 以教科书图9.7(a)为例 */
InitDSTable(&dt); /* 构造空表 */
for (i = 0; i < N; i++)
InsertBST(&dt, r[i]); /* 依次插入数据元素 */
TraverseDSTable(dt, print);
printf("\n请输入待查找的值: ");
scanf("%d", &j);
p = SearchBST(dt, j);
if (p)
{
printf("表中存在此值。");
DeleteBST(&dt, j);
printf("删除此值后:\n");
TraverseDSTable(dt, print);
printf("\n");
}
else
printf("表中不存在此值\n");
DestroyDSTable(&dt);
}
/*Binary Search Tree 节点插入操作*/
Status InsertBST(BinaryTree &btree, int data) {
BinaryTree p = NULL, node = NULL, f = NULL;
//没有找到节点才可以插入
if (!SearchBST(btree, data, f, p))
{
node = (BinaryTree)malloc(sizeof(TreeNode));
node->key = data;
node->lchild = NULL;
node->rchild = NULL;
if (!p)
{
btree = node;
}
else if (p->key>data)
{
p->lchild = node;
}
else
{
p->rchild = node;
}
return OK;
}
else return ERROR;
}
/* 否则指针p指向查找路径上访问的最后一个结点并返回FALSE */
Status SearchBST(BiTree T, int key, BiTree f, BiTree *p)
{
if (!T) /* 查找不成功 */
{
*p = f;
return FALSE;
}
else if (key==T->data) /* 查找成功 */
{
*p = T;
return TRUE;
}
else if (key<T->data)
return SearchBST(T->lchild, key, T, p); /* 在左子树中继续查找 */
else
return SearchBST(T->rchild, key, T, p); /* 在右子树中继续查找 */
}
bool SearchBST (BiTree T , int data , BiTree f , BiTree &p)
{
if(!T)
{
p = f ;
return false ;
}
else if ( data == T->digit )
{
p = T ;
return true ;
}
else if ( data < T->digit )
return SearchBST ( T->left_child , data , T , p );
else
return SearchBST ( T->right_child , data , T , p );
}
BiTree SearchBST(BiTree T,KeyType key)
{ /* 在根指针T所指二叉排序树中递归地查找某关键字等于key的数据元素， */
/* 若查找成功，则返回指向该数据元素结点的指针,否则返回空指针。算法9.5(a) */
if((!T)||EQ(key,T->data.key))
return T; /* 查找结束 */
else if LT(key,T->data.key) /* 在左子树中继续查找 */
return SearchBST(T->lchild,key);
else
return SearchBST(T->rchild,key); /* 在右子树中继续查找 */
BSTree SearchBST(BSTree T,KeyType key)
{ // 在根指针T所指二叉排序树中递归地查找某关键字等于key的数据元素，
// 若查找成功，则返回指向该数据元素结点的指针,否则返回空指针。算法9.5(a)
if((!T)||EQ(key,T->data.key))
return T; // 查找结束
else if LT(key,T->data.key) // 在左子树中继续查找
return SearchBST(T->lchild,key);
else
return SearchBST(T->rchild,key); // 在右子树中继续查找
/* Search Binary Sort Tree to find 'key'
* f points to T's parents, inlilated NULL
* if succeeded, p points to data structure, and return FALSE
* or, p points to last data structure of the path
*/
Status SearchBST(BitTree T, int key, BitTree f, BitTree *p)
{
if(!T) //terminal leaf
{
*p = f; //结点为叶结点时，*p指向双亲结点
return FALSE;
}
else if(key == T->data) //successfully searched
{
*p = T;
// printf("T->data:%d\n", T->data);
return TRUE;
}
else if(key < T->data)
{
return SearchBST(T->lchild, key, T, p);
}
else
return SearchBST(T->rchild, key, T, p);
}
Status deleteBST(BinaryTree btree, int key) {
BinaryTree p, f;
if (!SearchBST(btree, key, f, p))
{
return ERROR;//无法找到关键字，删除失败
}
else
{
deleteNode(p, f);
}
}
void main()
{
BSTree T;
char ch1,ch2;
KeyType Key;
printf("建立一棵二叉排序树的二叉链表存储\n");
T=CreateBST();
ch1='y';
while (ch1=='y' || ch1=='Y')
{
printf("请选择下列*作：\n");
printf("1------------------更新二叉排序树存储\n");
printf("2------------------二叉排序树上的查找\n");
printf("3------------------二叉排序树上的插入\n");
printf("4------------------二叉排序树上的删除\n");
printf("5------------------二叉排序树中序输出\n");
printf("6------------------退出\n");
scanf("\n%c",&ch2);
switch (ch2)
{
case '1':
T=CreateBST();
break;
case '2':
printf("\n请输入要查找的数据：");
scanf("\n%d",&Key);
SearchBST(T,Key);
printf("查找*作完毕。\n");
break;
case '3':
printf("\n请输入要插入的数据：");
scanf("\n%d",&Key);
InsertBST(&T,Key);
printf("插入*作完毕。\n");
break;
case '4':
printf("\n请输入要删除的数据：");
scanf("\n%d",&Key);
DelBSTNode(&T,Key);
printf("删除*作完毕。\n");
break;
case '5':
InorderBST(T);
printf("\n二叉排序树输出完毕。\n");
break;
case '6':
ch1='n';
break;
default:
ch1='n';
}
}
}
//�����㷨
int BiSearchT::InsertBST(BiTree *t,int e){
BiTree p;
BiTree s;
if(!SearchBST(*t,e,NULL,&p)){
s=(BiTree)malloc(sizeof(BiNode));
s->data=e;s->l=s->r=NULL;
if(!p) *t=s;
else if(e<p->data) p->l=s;
else p->r=s;
return true;
}
else return false;
}
Status InsertBST(BiTree *T,int key){
BiTree p,s;
if(!SearchBST(*T,key,NULL,&p)){
s=(BiTree)malloc(sizeof(BiTNode));
s->data=key;
s->lchild=s->rchild=NULL;
if(!p)*T=s;
else if(key<p->data)p->lchild=s;
else p->rchild=s;
return TRUE;
}
else return FALSE;
}
//返回key值的节点
Node* SearchBST(BST t, int key) {
Node *left;
Node *right;
if (t != NULL && t->key == key) {
return t;
}
else if (t != NULL) {
left = SearchBST(t->lChild, key); //搜索左子树
if (left == NULL) {
right = SearchBST(t->rChild, key); //搜索右子树
if (right != NULL)
return right;
else
return NULL;
} else {
return left;
}
}
else {
return NULL;
}
}
Status InsertBST(BiTree &T,ElemType e)
{
if(!SearchBST(T,e.key,NULL,p)){
s=(BiTree)malloc (sizeof(BiTNode));
s->data=e;
s->lchild=s->rchild=NULL;
if(!p)T=s;
else if(LT(e.key,p->data.key))p->lchild=s;
else p->rchild=s;
return TRUE;
}
else
return FALSE;
}
inline bool InsertBST ( BiTree &T , int data )
{
BiTree p = NULL , s = NULL ;
if( SearchBST (T, data , NULL , p ) )
return false ;
else
{
s = new BiNode ;
s->digit = data ;
if ( p == NULL )
T = s ;
else if ( data < p->digit )
p->left_child = s ;
else
p->right_child = s ;
return true ;
}
}
int main()
{
int a[] = {16, 53, 54, 75, 80, 99, 100, 110, 160, 161, 162};
int i, res, need = 17;
BitTree T = NULL, p;
for(i = 0; i < sizeof(a)/sizeof(a[0]); i++)
{
InsertBST(&T, a[i]);
}
res = SearchBST(T, need, NULL, &p);
if(FALSE == res)
fprintf(stderr, "Not found %d\n", need);
else
fprintf(stdout, "Has found %d\n", need);
}
/* 插入key并返回TRUE，否则返回FALSE */
Status InsertBST(BiTree *T, int key)
{
BiTree p,s;
if (!SearchBST(*T, key, NULL, &p)) /* 查找不成功 */
{
s = (BiTree)malloc(sizeof(BiTNode));
s->data = key;
s->lchild = s->rchild = NULL;
if (!p)
*T = s; /* 插入s为新的根结点 */
else if (key<p->data)
p->lchild = s; /* 插入s为左孩子 */
else
p->rchild = s; /* 插入s为右孩子 */
return TRUE;
}
else
return FALSE; /* 树中已有关键字相同的结点，不再插入 */
}
void main()
{
BSTNode *bt,*p,*f;
int n=12,x=46;
KeyType a[]={25,18,46,2,53,39,32,4,74,67,60,11};
bt=CreateBST(a,n);
printf("BST:");DispBST(bt);printf("\n");
printf("删除%d结点\n",x);
if (SearchBST(bt,x)!=NULL)
{
DeleteBST(bt,x);
printf("BST:");DispBST(bt);printf("\n");
}
x=18;
p=SearchBST1(bt,x,NULL,f);
if (f!=NULL)
printf("%d的双亲是%d\n",x,f->key);
}
/*
* 二叉排序树插入操作
* 当二叉排序树中存在关键字key的数据元素时
* 插入key并返回TRUE, 否则返回FALSE
*/
Status InsertBST(BitTree *T, int key)
{
BitTree p, s;
if(SearchBST(*T, key, NULL, &p)) //查找不成功
{
s = (BitTree)malloc(sizeof(BiTNode));
s->data = key;
printf("%d\n", key);
s->lchild = s->rchild = NULL;
if(!p)
*T = s; //插入s为新的根结点
else if(key < p->data)
p->lchild = s;
else
p->rchild = s;
return TRUE;
}
else
return FALSE;
}
void main()
{
BSTree dt, p;
Status k;
int i;
KeyType j;
ElemType r[N] = { {13,1},{24,2},{37,3},{90,4},{53,5} }; /* (以教科书图9.12为例) */
InitDSTable(&dt); /* 初始化空树 */
for (i = 0; i < N; i++)
InsertAVL(&dt, r[i], &k); /* 建平衡二叉树 */
TraverseDSTable(dt, print); /* 按关键字顺序遍历二叉树 */
printf("\n请输入待查找的关键字: ");
scanf("%d", &j);
p = SearchBST(dt, j); /* 查找给定关键字的记录 */
if (p)
print(p->data);
else
printf("表中不存在此值");
printf("\n");
DestroyDSTable(&dt);
}
int main()
{
int key, i;
BSTree bst, *pos;
CreateBST(&bst, source, ARRAYLEN);
printf("遍历二叉排序树结果:");
BST_LDR(&bst);
scanf_s("%d", &key);
pos = SearchBST(&bst, key);
if (pos)
{
printf("search successfull!");
}
else
{
printf("search failed!");
}
getchar();
getchar();
return 0;
}
int main() {
int num[1000] = {15, 55, 6, 7, 25, 2, 1, 66, 94, 64};
int n = 10;
BST T = NULL;
InitBST(T);
T->key = num[0];
int k = 1;
for (; k < n; k++) {
Node* node = NULL;
InitBST(node);
node->key = num[k];
InsertBST(T, node);
}
while (1) {
printf("现有的数字为：");
PrintNum(num, n);
printf("请选择：\n");
printf("1.添加节点并重新构造排序树\n2.删除节点\n3.先序遍历\n4.中序遍历\n5.后序遍历\n6.搜索结点\n");
int select;
scanf("%d", &select);
switch (select) {
case 1: {
printf("请添加key:");
int addNum;
scanf("%d", &addNum);
int i;
int flag = 0;
for (i = 0; i < n; i++) {
if (num[i] == addNum) {
printf("在数组中已存在该数字\n");
flag = -1;
break;
}
}
if (flag == -1) {
continue;
}
num[n] = addNum;
n++;
DestroyBST(T);
InitBST(T);
T->key = num[0];
i = 1;
for (; i < n; i++) {
Node* node = NULL;
InitBST(node);
node->key = num[i];
InsertBST(T, node);
}
break;
}
case 2: {
printf("请输入key:");
int delNum;
scanf("%d", &delNum);
int i;
int index;
int flag = 0;
for (i = 0; i < n; i++) {
if (num[i] == delNum) {
flag = 1;
index = i;
break;
}
}
if (flag == 0) {
printf("数组中没有这个key\n");
continue;
}
DeleteBST(T, delNum);
for (i = index; i < n - 1; i++) {
num[i] = num[i + 1];
}
n--;
break;
}
case 3:
PreOrderTraverseBST(T, Visit);
printf("\n");
break;
case 4:
InOrderTraverseBST(T, Visit);
printf("\n");
break;
case 5:
PostOrderTraverseBST(T, Visit);
printf("\n");
break;
case 6:
int searchKey;
printf("请输入key值：");
scanf("%d", &searchKey);
Node* node = SearchBST(T, searchKey);
if (node != NULL) {
printf("搜索成功！节点key值%d\n", node->key);
}
default:
break;
fflush(stdin);
}
}
}