package binarytree;
import java.util.LinkedList;
import java.util.Queue;
class Node {
Node left;
Node right;
int data;
}
class BinaryTree {
public int heightIteratively(Node node) {
if (node == null) {
return -1;
}
Queue<Node> q = new LinkedList<Node>();
q.add(node);
int height = 0;
while (true) {
int size = q.size();
if (size == 0) {
break;
}
while (size > 0) {
Node t = q.remove();
if (t.left != null) {
q.add(t.left);
}
if (t.right != null) {
q.add(t.right);
}
size--;
}
height = height + 1;
}
return height;
}
public int height(Node node) {
if(node == null) {
return -1;
}
return Math.max(height(node.left), height(node.right)) + 1;
}
public Node createNewNode(int val) {
Node newNode = new Node();
newNode.data = val;
newNode.left = null;
newNode.right = null;
return newNode;
}
}
public class BinaryTreeApp {
public static void main(String[] args) {
BinaryTree a = new BinaryTree();
Node root = a.createNewNode(2);
root.left = a.createNewNode(7);
root.right = a.createNewNode(5);
root.left.left = a.createNewNode(12);
root.left.right = a.createNewNode(6);
root.left.right.left = a.createNewNode(5);
root.left.right.right = a.createNewNode(11);
root.right.right = a.createNewNode(9);
root.right.right.left = a.createNewNode(4);
root.right.right.right = a.createNewNode(40);
System.out.println(a.heightIteratively(root));
}
}
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