Balanced Binary Tree in C++

This is a C++ Program to create a balanced binary tree. In computer science, a self-balancing (or height-balanced) binary search tree is any node-based binary search tree that automatically keeps its height (maximal number of levels below the root) small in the face of arbitrary item insertions and deletions.

Here is source code of the C++ Program to Create a Balanced Binary Tree of the Incoming Data. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

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#include <iostream>
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using namespace std;
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typedef struct bin_tree_node
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{
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        int v;
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        struct bin_tree_node *left;
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        struct bin_tree_node *right;
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} BTNode;
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BTNode *create_bin_tree_node(int v)
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{
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    BTNode *p = new BTNode;
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    if (p != NULL)
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    {
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        p->v = v;
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        p->left = NULL;
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        p->right = NULL;
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    }
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    return p;
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}
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void create_balanced_bin_tree(BTNode **root, int arr[], int start, int end)

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{
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    if (start <= end)
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    {
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        int mid = (start + end + 1) / 2;

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```

        *root = create_bin_tree_node(arr[mid]);

        create_balanced_bin_tree(&((*root)->left), arr, start, mid - 1);

        create_balanced_bin_tree(&((*root)->right), arr, mid + 1, end);

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    }
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}
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void print_bin_tree(BTNode *root)
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{
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    if (root != NULL)
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    {
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        cout << root->v << " ";
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        print_bin_tree(root->left);
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        print_bin_tree(root->right);
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    }
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}
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void print_bin_tree1(BTNode *root)
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{
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    if (root != NULL)
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    {
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        print_bin_tree1(root->left);
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        cout << root->v << " ";
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        print_bin_tree1(root->right);
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    }
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}
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int main(int argc, char* argv[])
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{
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    int arr[30];
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    for (int i = 0; i < 30; i++)
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    {
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        arr[i] = i;
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    }
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    BTNode *root = NULL;
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    create_balanced_bin_tree(&root, arr, 0, 29);

    cout << "Preorder of balanced tree is: ";

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    print_bin_tree(root);
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    cout << "\nInorder of balanced tree is: ";

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    print_bin_tree1(root);
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    return 0;
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}
```

Output:

$ g++ BalancedBinaryTree.cpp
$ a.out
 
Preorder of balanced tree is: 15 7 3 1 0 2 5 4 6 11 9 8 10 13 12 14 23 19 17 16 18 21 20 22 27 25 24 26 29 28 
Inorder of balanced tree is: 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 
 
------------------
(program exited with code: 0)
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