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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4.  
  5. class Ideone
  6. {
  7. 	public static void main (String[] args) throws java.lang.Exception
  8. 	{
  9. 		BTree<Integer> btree = new BTree<Integer>();
  10.  
  11. 		// ①二分木にノードを追加する
  12. 		btree.add(Integer.valueOf(2));
  13.  
  14. 		// ②二分木からノードを削除する
  15. 		btree.delete(Integer.valueOf(2));
  16. 	}
  17. }
  18.  
  19.  
  20. class BTree<T extends Comparable>
  21. {
  22. 	private class Node<T extends Comparable>
  23. 	{
  24. 		T item = null;
  25. 		Node<T> left = null;
  26. 		Node<T> right = null;
  27.  
  28. 		void add(T item) {
  29. 			if (this.item == null) {
  30. 				this.item = item;
  31. 			} else {
  32. 				if (this.item.compareTo(item) < 0) {
  33. 					if (left == null) {
  34. 						left = new Node<T>();
  35. 					}
  36. 					left.add(item);
  37. 				} else {
  38. 					if (right == null) {
  39. 						right = new Node<T>();
  40. 					}
  41. 					right.add(item);
  42. 				}
  43. 			}
  44. 		}
  45.  
  46. 		boolean delete(T item) {
  47. 			if (this.item != null) {
  48. 				if (this.item.compareTo(item) == 0) {
  49. 					this.item = null;
  50. 					return true;
  51. 				}
  52. 			}
  53. 			if (left != null) {
  54. 				if (left.delete(item)) {
  55. 					return true;
  56. 				}
  57. 			}
  58. 			if (right != null) {
  59. 				if (right.delete(item)) {
  60. 					return true;
  61. 				}
  62. 			}
  63. 			return false;
  64. 		}
  65. 	}
  66.  
  67. 	private Node<T> root = new Node<T>();
  68.  
  69. 	public void add(T item) {
  70. 		root.add(item);
  71. 	}
  72.  
  73. 	public boolean delete(T item) {
  74. 		return root.delete(item);
  75. 	}
  76. }
Success #stdin #stdout 0.07s 380224KB
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https://ideone.com/xWnMDM
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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