4. Diameter of Binary tree

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4. Diameter of Binary tree


Problem link :- click here


package Binary_Tree;

public class BinaryTree__4
{
	static int diameter = Integer.MIN_VALUE;
	
	static int heightOfTree(Node root)
	{
		if(root == null)
			return 0;
		
		int left_height = heightOfTree(root.left);
		int right_height = heightOfTree(root.right);
		
		diameter = Math.max(diameter, (left_height + right_height + 1) );
		
		return Math.max(left_height, right_height) + 1;
	}
	
	static int diameterOfTTree(Node root)
	{
		if(root == null)
			return 0;
		heightOfTree(root);
		return diameter;
	}

	public static void main(String[] args)
	{
		BinaryTree tree = new BinaryTree();
		int arr[] = {10, 20, 30, 40, 60};
		tree.root = tree.createTree(arr, 0);
		
		int ans = diameterOfTTree(tree.root);
		System.out.println("Answer is : "  + ans);
	}

}

Time complexity :- O(n)
Space complexity :- O(Height of the tree)

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