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- /*
- * To change this license header, choose License Headers in Project Properties.
- * To change this template file, choose Tools | Templates
- * and open the template in the editor.
- */
- package pkg1zad;
- class BNode<E extends Comparable<E>> {
- public E info;
- public BNode<E> left;
- public BNode<E> right;
- public BNode(E info) {
- this.info = info;
- left = null;
- right = null;
- }
- public BNode(E info, BNode<E> left, BNode<E> right) {
- this.info = info;
- this.left = left;
- this.right = right;
- }
- }
- //
- // CONSTRUCTION: with no initializer
- //
- // ******************PUBLIC OPERATIONS*********************
- // void insert( x ) --> Insert x
- // void remove( x ) --> Remove x
- // Comparable find( x ) --> Return item that matches x
- // Comparable findMin( ) --> Return smallest item
- // Comparable findMax( ) --> Return largest item
- // boolean isEmpty( ) --> Return true if empty; else false
- // void makeEmpty( ) --> Remove all items
- // void printTree( ) --> Print tree in sorted order
- /**
- * Implements an unbalanced binary search tree.
- * Note that all "matching" is based on the compareTo method.
- * @author Mark Allen Weiss
- */
- class BinarySearchTree<E extends Comparable<E>> {
- /** The tree root. */
- private BNode<E> root;
- /**
- * Construct the tree.
- */
- public BinarySearchTree() {
- root = null;
- }
- /**
- * Insert into the tree; duplicates are ignored.
- * @param x the item to insert.
- */
- public void insert(E x) {
- root = insert(x, root);
- }
- /**
- * Remove from the tree. Nothing is done if x is not found.
- * @param x the item to remove.
- */
- public void remove(E x) {
- root = remove(x, root);
- }
- /**
- * Find the smallest item in the tree.
- * @return smallest item or null if empty.
- */
- public E findMin() {
- return elementAt(findMin(root));
- }
- /**
- * Find the largest item in the tree.
- * @return the largest item of null if empty.
- */
- public E findMax() {
- return elementAt(findMax(root));
- }
- /**
- * Find an item in the tree.
- * @param x the item to search for.
- * @return the matching item or null if not found.
- */
- public BNode<E> find(E x) {
- return find(x, root);
- }
- /**
- * Make the tree logically empty.
- */
- public void makeEmpty() {
- root = null;
- }
- /**
- * Test if the tree is logically empty.
- * @return true if empty, false otherwise.
- */
- public boolean isEmpty() {
- return root == null;
- }
- /**
- * Print the tree contents in sorted order.
- */
- public void printTree() {
- if (isEmpty()) {
- System.out.println("Empty tree");
- } else {
- printTree(root);
- }
- }
- /**
- * Internal method to get element field.
- * @param t the node.
- * @return the element field or null if t is null.
- */
- private E elementAt(BNode<E> t) {
- if (t == null)
- return null;
- return t.info;
- }
- /**
- * Internal method to insert into a subtree.
- * @param x the item to insert.
- * @param t the node that roots the tree.
- * @return the new root.
- */
- private BNode<E> insert(E x, BNode<E> t) {
- if (t == null) {
- t = new BNode<E>(x, null, null);
- } else if (x.compareTo(t.info) < 0) {
- t.left = insert(x, t.left);
- } else if (x.compareTo(t.info) > 0) {
- t.right = insert(x, t.right);
- } else; // Duplicate; do nothing
- return t;
- }
- /**
- * Internal method to remove from a subtree.
- * @param x the item to remove.
- * @param t the node that roots the tree.
- * @return the new root.
- */
- private BNode<E> remove(Comparable x, BNode<E> t) {
- if (t == null)
- return t; // Item not found; do nothing
- if (x.compareTo(t.info) < 0) {
- t.left = remove(x, t.left);
- } else if (x.compareTo(t.info) > 0) {
- t.right = remove(x, t.right);
- } else if (t.left != null && t.right != null) { // Two children
- t.info = findMin(t.right).info;
- t.right = remove(t.info, t.right);
- } else {
- if (t.left != null)
- return t.left;
- else
- return t.right;
- }
- return t;
- }
- /**
- * Internal method to find the smallest item in a subtree.
- * @param t the node that roots the tree.
- * @return node containing the smallest item.
- */
- private BNode<E> findMin(BNode<E> t) {
- if (t == null) {
- return null;
- } else if (t.left == null) {
- return t;
- }
- return findMin(t.left);
- }
- /**
- * Internal method to find the largest item in a subtree.
- * @param t the node that roots the tree.
- * @return node containing the largest item.
- */
- private BNode<E> findMax(BNode<E> t) {
- if (t == null) {
- return null;
- } else if (t.right == null) {
- return t;
- }
- return findMax(t.right);
- }
- /**
- * Internal method to find an item in a subtree.
- * @param x is item to search for.
- * @param t the node that roots the tree.
- * @return node containing the matched item.
- */
- private BNode<E> find(E x, BNode<E> t) {
- if (t == null)
- return null;
- if (x.compareTo(t.info) < 0) {
- return find(x, t.left);
- } else if (x.compareTo(t.info) > 0) {
- return find(x, t.right);
- } else {
- return t; // Match
- }
- }
- /**
- * Internal method to print a subtree in sorted order.
- * @param t the node that roots the tree.
- */
- private void printTree(BNode<E> t) {
- if (t != null) {
- printTree(t.left);
- System.out.println(t.info);
- printTree(t.right);
- }
- }
- // Test program
- }
- public class Main {
- /**
- * @param args the command line arguments
- */
- public static void main(String[] args) {
- // TODO code application logic here
- int niza[];
- niza = new int[]{23,5,17,32,2,8,4,37,3,5,27,12,15,19,20,6,3,9,29,11};
- //smestuvanje na niza vo drvo
- BinarySearchTree<Integer> tree=new BinarySearchTree();
- for(int i=0;i<niza.length;i++)
- {
- tree.insert(niza[i]);
- }
- //izbrisi el 6
- tree.remove(6);
- tree.printTree();
- }
- }
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