Height of a Binary Tree - The Coding Shala

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Height of a Binary Tree

The Binary tree is given you have to find the height of the given binary tree. The height of a binary tree h the number of edges between the tree's root and its furthest leaf. (Maximum depth of a Binary Tree.)

Example
Height of a Binary Tree - The Coding Shala

Height of a Binary Tree Java Program


Method 1:

Using recursion.

Java Code: 
public static int height(Node root) {
       // Write your code here.
          int hi = -1;
          if(root == null) return hi;
          return 1+ Math.max(height(root.left), height(root.right));
    }

Method 2:
Using the queue(level order traversal).

 Java Code: 

public static int height(Node root) {
       // Write your code here.
          int hi = 0;
          if(root == null) return hi;
          Queue<Node> queue = new LinkedList<>();
          queue.offer(root);
          while(!queue.isEmpty()){
              int size = queue.size();
              for(int i=0; i<size; i++){
                  Node curr = queue.poll();
                  if(curr.left != null) queue.offer(curr.left);
                  if(curr.right != null) queue.offer(curr.right);
              }
              hi++;
          }
        return hi-1;
    }




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