f (x < parent->data){ /* 链接到左指针域 */
parent->left = p;
}else{
parent->right = p;
}
return;
}
/* 3.建立 */
void createBSTree(struct BTreeNode* *bst, elemType a, int n)
{
int i;
*bst = NULL;
for (i = 0; i < n; i++){
insertBSTree1(bst, a[i]);
}
return;
}
/* 4.删除值为x的结点,成功返回1,失败返回0 */
int deleteBSTree(struct BTreeNode* *bst, elemType x)
{
struct BTreeNode *temp = *bst;
if (*bst == NULL){
return 0;
}
if (x < (*bst)->data){
return deleteBSTree(&((*bst)->left), x); /* 向左子树递归 */
}
if (x > (*bst)->data){
return deleteBSTree(&((*bst)->right), x); /* 向右子树递归 */
}
/* 待删除的元素等于树根结点值且左子树为空,将右子树作为整个树并返回1 */
if ((*bst)->left == NULL){
*bst = (*bst)->right;
free(temp);
return 1;
}
/* 待删除的元素等于树根结点值且右子树为空,将左子树作为整个树并返回1 */
if ((*bst)->right == NULL){
*bst = (*bst)->left;
free(temp);
return 1;
}else{
/* 中序前驱结点为空时,把左孩子结点值赋给树根结点,然后从左子树中删除根结点 */
if ((*bst)->left->right == NULL){
(*bst)->data = (*bst)->left->data;
return deleteBSTree(&((*bst)->left), (*bst)->data);
}else{ /* 定位到中序前驱结点,把该结点值赋给树根结点,然后从以中序前驱结点为根的
树上删除根结点*/
struct BTreeNode *p1 = *bst, *p2 = p1->left;
while (p2->right != NULL){
p1 = p2;
p2 = p2->right;
}
(*bst)->data = p2->data;
return deleteBSTree(&(p1->right), p2->data);
}
}
}
/************************************************************************/
int main(int argc, char *argv)
{
int x, *px;
elemType a = {30, 50, 20, 40, 25, 70, 54, 23, 80, 92};
struct BTreeNode *bst = NULL;
createBSTree(&bst, a, 10);
printf("建立的二叉搜索树的广义表形式为: ");
printBTree(bst);
printf(" ");
printf("中序遍历: ");
inOrder(bst);
printf(" ");
printf("输入待查找元素的值:");
scanf(" %d", &x);
if (px = findBSTree1(bst, x)){
printf("查找成功!得到的x为:%d ", *px);
}else{
printf("查找失败! ");
}
printf("输入待插入的元素值:");
scanf(" %d", &x);
insertBSTree1(&bst, x);
printf("输入待删除元素值:");
scanf(" %d", &x);
if (deleteBSTree(&bst, x)){
printf("1 ");
}else{
printf("0 ");
}
printf("进行相应操作后的中序遍历为: ");
inOrder(bst);
printf(" ");