How do I insert an unsorted array into a Binary Search Tree as a Doubly Linked List in C++?
#include <iostream>
#include <cstdlib>
using namespace std;
class BinarySearchTree
{
private:
struct tree_node
{
tree_node* left;
tree_node* right;
int data;
};
tree_node* root;
public:
BinarySearchTree()
{
root = NULL;
}
bool isEmpty() const { return root == NULL; }
void print_inorder();
void inorder(tree_node*);
void insert(int);
};
// Smaller elements go left
// larger elements go right
void BinarySearchTree::insert(int d)
{
tree_node* t = new tree_node;
tree_node* parent;
t->data = d;
t->left = NULL;
t->right = NULL;
parent = NULL;
// is this a new tree?
if (isEmpty()) root = t;
else
{
//Note: ALL insertions are as leaf nodes
tree_node* curr;
curr = root;
// Find the Node's parent
while (curr)
{
parent = curr;
if (t->data > curr->data) curr = curr->right;
else curr = curr->left;
}
if (t->data < parent->data)
parent->left = t;
else
parent->right = t;
}
}
void BinarySearchTree::print_inorder()
{
inorder(root);
}
void BinarySearchTree::inorder(tree_node* p)
{
if (p != NULL)
{
if (p->left) inorder(p->left);
cout << " " << p->data << " ";
if (p->right) inorder(p->right);
}
else return;
}
int main()
{
BinarySearchTree b;
int arr[] = {10,4,3,6,1,2};
cout << " Insertion/Creation " << endl;
for(int i= 0 ; i<6;++i)
b.insert(arr[i]);
cout << " Insertion Done " << endl;
cout << " In-Order Traversal " << endl;
b.print_inorder();
}
===========================
See Output
Thanks, PLEASE UPVOTE if helpful
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