Build Binary Search Tree
#include <iostream>
#include <queue>
using namespace std;
struct TreeNode
{
int val;
TreeNode *left;
TreeNode *right;
TreeNode() : val(0), left(nullptr), right(nullptr) {}
TreeNode(int x) : val(x), left(nullptr), right(nullptr) {}
TreeNode(int x, TreeNode *left, TreeNode *right) :
val(x), left(left), right(right) {}
};
TreeNode *insert(int d, TreeNode *root)
{
if (root == NULL)
return new TreeNode(d);
else if (root->val == d)
return root;
else if (root->val < d)
root->right = insert(d, root->right);
else if (root->val > d)
root->left = insert(d, root->left);
return root;
}
TreeNode *BuildTree()
{
TreeNode *root = NULL;
int d;
cin >> d;
if (d == -1)
return NULL;
while (d != -1)
{
root = insert(d, root);
cout << "Enter another Value to be entered : ";
cin >> d;
}
return root;
}
void print(TreeNode *root)
{
if (root == NULL)
return;
print(root->left);
cout << root->val << " ";
print(root->right);
}
void bfs(TreeNode *root)
{
queue<TreeNode *> q;
q.push(root);
q.push(NULL);
while (!q.empty())
{
TreeNode *temp = q.front();
q.pop();
if (temp == NULL)
{
cout << endl;
if (!q.empty())
q.push(NULL);
}
else
{
cout << temp->val << " ";
if (temp->left != NULL)
q.push(temp->left);
if (temp->right != NULL)
q.push(temp->right);
}
}
}
int main()
{
TreeNode *root = BuildTree();
cout << "The inorder of Tree is : ";
print(root);
cout << "\nThe level order traversal will be : \n";
bfs(root);
}
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