#include<bits/stdc++.h>
using namespace std;
struct node
{
int key;
struct node *left, *right;
};
// A function to create a new BST node
struct node *newNode(int item)
{
struct node *temp = (struct node
*)malloc(sizeof(struct node));
temp->key = item;
temp->left = temp->right = NULL;
return temp;
}
/* A function to insert a new node with given key in BST
*/
struct node* add(struct node* node, int key)
{
if (node == NULL) return newNode(key);
if (key < node->key)
node->left =
add(node->left, key);
else if (key > node->key)
node->right =
add(node->right, key);
return node;
}
/* Given a non-empty binary search tree, return the node with
minimum
key value found in that tree. Note that the entire
tree does not
need to be searched. */
struct node * minValueNode(struct node* node)
{
struct node* current = node;
/* loop down to find the leftmost leaf
*/
while (current->left != NULL)
current =
current->left;
return current;
}
/* Given a binary search tree and a key, this function deletes
the key
and returns the new root */
struct node* remove(struct node* root, int key)
{
// base case
if (root == NULL) return root;
// If the key to be deleted is smaller than
the root's key,
// then it lies in left subtree
if (key < root->key)
root->left =
remove(root->left, key);
// If the key to be deleted is greater than
the root's key,
// then it lies in right subtree
else if (key > root->key)
root->right =
remove(root->right, key);
// if key is same as root's key, then This is
the node
// to be deleted
else
{
// node with only one
child or no child
if (root->left ==
NULL)
{
struct node *temp = root->right;
free(root);
return temp;
}
else if (root->right
== NULL)
{
struct node *temp = root->left;
free(root);
return temp;
}
// node with two
children: Get the inorder successor (smallest
// in the right
subtree)
struct node* temp =
minValueNode(root->right);
// Copy the inorder
successor's content to this node
root->key =
temp->key;
// Delete the inorder
successor
root->right =
remove(root->right, temp->key);
}
return root;
}
// A function to do inorder traversal of BST
void inorder(struct node *root)
{
if (root != NULL)
{
inorder(root->left);
printf("%d ",
root->key);
inorder(root->right);
}
}
int main()
{
struct node *root = NULL;
root = add(root, 50);
add(root, 20);
add(root, 75);
add(root, 98);
add(root, 80);
add(root, 31);
add(root, 150);
add(root, 39);
add(root, 23);
add(root, 11);
add(root, 77);
cout<<"inoreder traversal of binary search
tree: \n";
inorder(root);
return 0;
}
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