Find Maximum in Binary Tree

Problem link

Recursion Steps:
  • If the node is null return Integers min value
  • Maximum is the max of node data, left subtree and right subtree.
Code:

package may;

public class MaximumInTree {
   
    Node root;
   
    int findMax(Node node){
        if(node == null)
            return Integer.MIN_VALUE;
       
        return Math.max(Math.max(node.data, findMax(node.left)), findMax(node.right));
    }
   
    public static void main(String args[])
    {
        MaximumInTree tree = new MaximumInTree();
        tree.root = new Node(2);
        tree.root.left = new Node(7);
        tree.root.right = new Node(5);
        tree.root.left.right = new Node(6);
        tree.root.left.right.left = new Node(1);
        tree.root.left.right.right = new Node(11);
        tree.root.right.right = new Node(9);
        tree.root.right.right.left = new Node(4);

        System.out.println("Maximum element is " +
                         tree.findMax(tree.root));
    }

}


Output:

Maximum element is 11
 

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