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问题描述:
BinarySearchTree
问题分析:
基本的实现
代码实现:
package c04; /** * @project: DataStructureAndAlgorithmAnalysis * @filename: BinarySearchTree.java * @version: 0.10 * @author: JM Han * @date: 18:38 2015/10/19 * @comment: Test Purpose * @result: */ import c02.BinarySearch; import master.UnderflowException; import java.util.Comparator; import static tool.util.*; public class BinarySearchTree<AnyType extends Comparable<? super AnyType>> { private static class BinaryNode<AnyType>{ BinaryNode(AnyType theElement) {this(theElement, null, null);} BinaryNode(AnyType theElement, BinaryNode<AnyType> lt, BinaryNode<AnyType> rt) {element = theElement; left = lt; right = rt;} AnyType element; BinaryNode<AnyType> left; BinaryNode<AnyType> right; } private BinaryNode<AnyType> root; public BinarySearchTree(){ root = null; } public void makeEmpty(){ root = null; } public boolean isEmpty(){ return null == root; } public boolean contains(AnyType x){ return contains(x, root); } public AnyType findMin(){ if(isEmpty()) throw new UnderflowException(); return findMin(root).element; } public AnyType findMax(){ if(isEmpty()) throw new UnderflowException(); return findMax(root).element; } public void insert(AnyType x){ root = insert(x, root); } public void remove(AnyType x){ root = remove(x, root); } public void printTree(){ if(isEmpty()) System.out.println("Empty Tree"); else printTree(root); } private boolean contains(AnyType x, BinaryNode<AnyType> t){ if(t == null) return false; int comparableResult = x.compareTo(t.element); if(comparableResult < 0) return contains(x, t.left); else if(comparableResult > 0) return contains(x, t.right); else return true; } private BinaryNode<AnyType> findMin(BinaryNode<AnyType> t){ if(null == t) return null; else if(t.left == null) return t; return findMax(t.left); } private BinaryNode<AnyType> findMax(BinaryNode<AnyType> t){ if(t != null) while(t.right != null) t = t.right; return t; } private BinaryNode<AnyType> insert(AnyType x, BinaryNode<AnyType> t){ if(null == t) return new BinaryNode<AnyType>(x, null, null); int compareResult = x.compareTo(t.element); if(compareResult < 0) t.left = insert(x, t.left); else if(compareResult > 0) t.right = insert(x, t.right); else ; return t; } private BinaryNode<AnyType> remove(AnyType x, BinaryNode<AnyType> t){ if(null == t) return t; int compareResult = x.compareTo(t.element); if(compareResult < 0) t.left = remove(x, t.left); else if(compareResult > 0) t.right = remove(x, t.right); else if(t.left != null && t.right != null){ t.element = findMin(t.right).element; t.right = remove(t.element, t.right); } else t = (t.left != null)?t.left:t.right; return t; } private void printTree(BinaryNode<AnyType> t){ if(null != t){ printTree(t.left); System.out.println(t.element); printTree(t.right); } } public static void main(String[] args) { BinarySearchTree<Integer> bst = new BinarySearchTree<Integer>(); bst.insert(4); bst.insert(3); bst.insert(6); bst.insert(0); bst.insert(2); bst.insert(3); bst.printTree(); } }
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原文地址:http://my.oschina.net/jimmyhan/blog/519351