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  1. /**
  2.  * Remove Leaf Nodes from a Given Binary Tree
  3.  * @author Prateek
  4.  */
  5.  class RemoveLeaves {
  6. 	/**
  7. 	 *Remove Leave Nodes 
  8. 	 */
  9. 	public Node pruneLeaves(Node root){
  10. 		if(root.left== null && root.right==null)
  11. 			return null;
  12. 		else
  13. 		{
  14. 			if(root.left!=null)
  15. 			root.left = pruneLeaves(root.left);
  16. 			if(root.right!=null)
  17. 			root.right = pruneLeaves(root.right);
  18. 		}
  19. 		return root;
  20. 	}
  21.  
  22. 	/**
  23. 	 * Inorder Traversal
  24. 	 */
  25. 	public void inorder(Node root) {
  26. 		if (root != null) {
  27. 			inorder(root.left);
  28. 			System.out.print(root.data + "\t");
  29. 			inorder(root.right);
  30. 		}
  31. 	}
  32.  
  33. 	public static void main(String[] args) {
  34. 		Node root = new Node(1);
  35. 		root.left = new Node(2);
  36. 		root.left.left = new Node(4);
  37. 		root.left.right = new Node(5);
  38. 		root.left.right.left = new Node(8);
  39. 		root.left.right.left.right = new Node(9);
  40. 		root.left.right.left.right.left = new Node(10);
  41.  
  42. 		root.right = new Node(3);
  43. 		root.right.left = new Node(6);
  44. 		root.right.right = new Node(7);
  45.  
  46. 		RemoveLeaves obj=new RemoveLeaves();
  47. 		System.out.println("Before: ");
  48. 		obj.inorder(root);
  49. 		obj.pruneLeaves(root);
  50. 		System.out.println("\nAfter: ");
  51. 		obj.inorder(root);
  52. 	}
  53. }
  54.  
  55. class Node {
  56. 	public Node left;
  57. 	public int data;
  58. 	public Node right;
  59.  
  60. 	public Node(int val)	{
  61. 		this.data=val;
  62. 	}
  63.  
  64. 	@Override
  65. 	public String toString(){
  66. 		return this.data + "";
  67. 	}
  68. }
  69.  
  70.  
Success #stdin #stdout 0.06s 380224KB
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Standard input is empty
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Before: 
4	2	8	10	9	5	1	6	3	7	
After: 
2	8	9	5	1	3
https://ideone.com/orTldp
Remove Leaf Nodes
language:
Java (12.0.1)
created:
10 years ago
visibility:
public

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