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This commit is contained in:
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||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week5/StackDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="68">
|
||||
<caret line="4" column="8" lean-forward="false" selection-start-line="4" selection-start-column="8" selection-end-line="4" selection-end-column="8" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="3570">
|
||||
<caret line="210" column="6" lean-forward="true" selection-start-line="204" selection-start-column="4" selection-end-line="212" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="765">
|
||||
<caret line="47" column="25" lean-forward="true" selection-start-line="47" selection-start-column="25" selection-end-line="47" selection-end-column="25" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="374">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="3468">
|
||||
<caret line="210" column="9" lean-forward="true" selection-start-line="204" selection-start-column="4" selection-end-line="212" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/Exam1Review.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="476">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="799">
|
||||
<caret line="47" column="30" lean-forward="false" selection-start-line="47" selection-start-column="30" selection-end-line="47" selection-end-column="30" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="1292">
|
||||
<caret line="82" column="0" lean-forward="false" selection-start-line="82" selection-start-column="0" selection-end-line="82" selection-end-column="0" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="935">
|
||||
<caret line="57" column="5" lean-forward="false" selection-start-line="57" selection-start-column="5" selection-end-line="57" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="374">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/Exam1Review.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="935">
|
||||
<caret line="57" column="5" lean-forward="false" selection-start-line="57" selection-start-column="5" selection-end-line="57" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="476">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="935">
|
||||
<caret line="57" column="5" lean-forward="false" selection-start-line="57" selection-start-column="5" selection-end-line="57" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="374">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="2040">
|
||||
<caret line="126" column="29" lean-forward="false" selection-start-line="126" selection-start-column="29" selection-end-line="126" selection-end-column="29" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="935">
|
||||
<caret line="57" column="5" lean-forward="false" selection-start-line="57" selection-start-column="5" selection-end-line="57" selection-end-column="5" />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="374">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/Exam1Review.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWArrayList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="782">
|
||||
<caret line="48" column="25" lean-forward="false" selection-start-line="48" selection-start-column="25" selection-end-line="48" selection-end-column="25" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week5/AdapterStack.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="136">
|
||||
<caret line="8" column="8" lean-forward="false" selection-start-line="8" selection-start-column="8" selection-end-line="8" selection-end-column="8" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedListDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="374">
|
||||
<caret line="28" column="34" lean-forward="false" selection-start-line="28" selection-start-column="34" selection-end-line="28" selection-end-column="34" />
|
||||
<folding>
|
||||
<element signature="e#0#807#0" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week5/KMStack.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="272">
|
||||
<caret line="23" column="0" lean-forward="false" selection-start-line="23" selection-start-column="0" selection-end-line="23" selection-end-column="0" />
|
||||
<folding>
|
||||
<element signature="e#178#179#0" expanded="true" />
|
||||
<element signature="e#216#217#0" expanded="true" />
|
||||
<element signature="e#258#259#0" expanded="true" />
|
||||
<element signature="e#295#296#0" expanded="true" />
|
||||
<element signature="e#329#330#0" expanded="true" />
|
||||
<element signature="e#377#378#0" expanded="true" />
|
||||
<marker date="1538432048000" expanded="true" signature="509:515" ph=" }" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week5/StackDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="68">
|
||||
<caret line="4" column="8" lean-forward="false" selection-start-line="4" selection-start-column="8" selection-end-line="4" selection-end-column="8" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week1/KWSingleLinkedList.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="3536">
|
||||
<caret line="214" column="6" lean-forward="false" selection-start-line="214" selection-start-column="6" selection-end-line="214" selection-end-column="6" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week6/BinaryTree.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week6/ComparableDriver.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week6/Student.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week9/AVLTree/Notes.java" />
|
||||
<entry file="file://$PROJECT_DIR$/src/Week6/BinaryTree/BSTDriver.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="68">
|
||||
<caret line="5" column="13" lean-forward="false" selection-start-line="5" selection-start-column="13" selection-end-line="5" selection-end-column="13" />
|
||||
<folding>
|
||||
<element signature="imports" expanded="true" />
|
||||
</folding>
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week9/AVLTree/BinarySearchTreeWithRotate.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="204">
|
||||
<caret line="12" column="13" lean-forward="false" selection-start-line="12" selection-start-column="13" selection-end-line="12" selection-end-column="13" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week9/AVLTree/AVLTree.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="1904">
|
||||
<caret line="114" column="9" lean-forward="false" selection-start-line="103" selection-start-column="10" selection-end-line="114" selection-end-column="9" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week6/BinaryTree/BinaryTree.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="4148">
|
||||
<caret line="258" column="7" lean-forward="false" selection-start-line="258" selection-start-column="7" selection-end-line="258" selection-end-column="7" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
<entry file="file://$PROJECT_DIR$/src/Week5/Recursion.java">
|
||||
<provider selected="true" editor-type-id="text-editor">
|
||||
<state relative-caret-position="442">
|
||||
<caret line="29" column="5" lean-forward="false" selection-start-line="20" selection-start-column="4" selection-end-line="29" selection-end-column="5" />
|
||||
<folding />
|
||||
</state>
|
||||
</provider>
|
||||
</entry>
|
||||
</component>
|
||||
<component name="masterDetails">
|
||||
<states>
|
||||
<state key="ArtifactsStructureConfigurable.UI">
|
||||
<settings>
|
||||
<artifact-editor />
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="FacetStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>No facets are configured</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="GlobalLibrariesConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="JdkListConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>1.8</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="ModuleStructureConfigurable.UI">
|
||||
<settings>
|
||||
<last-edited>Notes</last-edited>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
<option value="0.6" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
<state key="ProjectLibrariesConfigurable.UI">
|
||||
<settings>
|
||||
<splitter-proportions>
|
||||
<option name="proportions">
|
||||
<list>
|
||||
<option value="0.2" />
|
||||
</list>
|
||||
</option>
|
||||
</splitter-proportions>
|
||||
</settings>
|
||||
</state>
|
||||
</states>
|
||||
</component>
|
||||
</project>
|
||||
@@ -0,0 +1,11 @@
|
||||
<?xml version="1.0" encoding="UTF-8"?>
|
||||
<module type="JAVA_MODULE" version="4">
|
||||
<component name="NewModuleRootManager" inherit-compiler-output="true">
|
||||
<exclude-output />
|
||||
<content url="file://$MODULE_DIR$">
|
||||
<sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
|
||||
</content>
|
||||
<orderEntry type="inheritedJdk" />
|
||||
<orderEntry type="sourceFolder" forTests="false" />
|
||||
</component>
|
||||
</module>
|
||||
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
Binary file not shown.
@@ -0,0 +1,18 @@
|
||||
package Week1;
|
||||
|
||||
import java.util.Iterator;
|
||||
import java.util.List;
|
||||
|
||||
public class Exam1Review {
|
||||
|
||||
|
||||
private static double findMax(List<Double> listOfDoubles) {
|
||||
double max = 0.0;
|
||||
//could also use foreach
|
||||
Iterator<Double> it = listOfDoubles.iterator();
|
||||
while(it.hasNext()){
|
||||
max = Math.max(max,it.next());
|
||||
}
|
||||
return max;
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,84 @@
|
||||
package Week1;
|
||||
|
||||
import java.util.Arrays;
|
||||
|
||||
public class KWArrayList<E> {
|
||||
private static final int INITIAL_CAPACITY = 10;
|
||||
private static final int GROWTH_FACTOR = 2;
|
||||
private int size = 0;
|
||||
private int capacity;
|
||||
private E[] data;
|
||||
|
||||
public KWArrayList() {
|
||||
capacity = INITIAL_CAPACITY;
|
||||
data = (E[]) new Object[capacity];
|
||||
}
|
||||
|
||||
public E get(int index) throws IndexOutOfBoundsException{
|
||||
if(index < 0 || index > size) {
|
||||
throw new IndexOutOfBoundsException();
|
||||
}
|
||||
return data[index];
|
||||
}
|
||||
|
||||
public E set(int index, E newValue) throws IndexOutOfBoundsException{
|
||||
if(index < 0 || index > size) {
|
||||
throw new IndexOutOfBoundsException();
|
||||
}
|
||||
E oldValue = data[index];
|
||||
data[index] = newValue;
|
||||
return oldValue;
|
||||
}
|
||||
|
||||
public int size() {
|
||||
return this.size;
|
||||
}
|
||||
|
||||
//ArrayList add
|
||||
public boolean add(E entry) {
|
||||
if(size == data.length) {
|
||||
reallocate();
|
||||
}
|
||||
data[size] = entry;
|
||||
size++;
|
||||
return true;
|
||||
}
|
||||
//ArrayList add
|
||||
public void add(int index, E element) {
|
||||
if(size == data.length) {
|
||||
reallocate();
|
||||
}
|
||||
if (index < 0 || index >= size) {
|
||||
throw new IndexOutOfBoundsException();
|
||||
}
|
||||
for(int i = size; i < index; i--) {
|
||||
data[i] = data [i-1];
|
||||
}
|
||||
data[index] = element;
|
||||
++size;
|
||||
}
|
||||
|
||||
public void reallocate() {
|
||||
capacity *= GROWTH_FACTOR;
|
||||
data = Arrays.copyOf(data,capacity);
|
||||
}
|
||||
|
||||
//ArrayList remove
|
||||
public void remove(int index) {
|
||||
if (index < 0 || index >= size) {
|
||||
throw new IndexOutOfBoundsException();
|
||||
}
|
||||
for(int i = index; i == size; i++) {
|
||||
data[i] = data [i+1];
|
||||
}
|
||||
--size;
|
||||
}
|
||||
|
||||
public void remove(E target) {
|
||||
for (int i = 0; i > size ; i++) {
|
||||
if (data[i] == target) {
|
||||
remove(i);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,236 @@
|
||||
/*
|
||||
* CS2852
|
||||
* Spring 2018
|
||||
* KWLinkedList
|
||||
* Name: Sean Jones
|
||||
* Created: 03/07/2018
|
||||
*/
|
||||
package Week1;
|
||||
|
||||
/**
|
||||
* This class implements some of the methods of the Java ArrayList class. It
|
||||
* does not implement the List interface.
|
||||
* @param <E> Generic type that will be declared by the user
|
||||
*/
|
||||
public class KWSingleLinkedList<E> {
|
||||
private Node<E> head = null;
|
||||
private int size = 0;
|
||||
|
||||
/**
|
||||
* Returns the element at the specified index (not LinkedList behavior)
|
||||
*
|
||||
* Throws an ArrayIndexOutOfBoundsException on invalid index
|
||||
*
|
||||
* @param index The index of the element to be returned
|
||||
* @return The element stored in the specified index
|
||||
* @throws ArrayIndexOutOfBoundsException thrown when index is invalid
|
||||
*/
|
||||
public E get(int index) throws ArrayIndexOutOfBoundsException {
|
||||
if(index < 0 || index >= size) {
|
||||
throw new ArrayIndexOutOfBoundsException(index);
|
||||
}
|
||||
Node<E> node = getNode(index);
|
||||
return node.data;
|
||||
}
|
||||
|
||||
/**
|
||||
* Sets a specified value at a specified index in the list (not LinkedList behavior)
|
||||
*
|
||||
* @param index The index where the new value will be stored
|
||||
* @param newValue The value to be stored in the specified index
|
||||
* @return The element previously stored at the specified index
|
||||
* @throws ArrayIndexOutOfBoundsException thrown when index is invalid
|
||||
*/
|
||||
public E set(int index, E newValue) throws ArrayIndexOutOfBoundsException {
|
||||
if(index < 0 || index >= size) {
|
||||
throw new ArrayIndexOutOfBoundsException(index);
|
||||
}
|
||||
Node<E> node = getNode(index);
|
||||
E result = node.data;
|
||||
node.data = newValue;
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Special add method for adding the first Node to the KWSIngleLinkedList.
|
||||
*
|
||||
* @param item The element to be added as the head of the list
|
||||
*/
|
||||
public void addFirst(E item) {
|
||||
head = new Node<>(item, head);
|
||||
size++;
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a new Node to a specified index of the KWSingleLinkedList (not LinkedList behavior)
|
||||
* @param index The index where the element will be added
|
||||
* @param item The element to be added
|
||||
* @throws ArrayIndexOutOfBoundsException thrown when index is invalid
|
||||
*/
|
||||
public void add(int index, E item) throws ArrayIndexOutOfBoundsException {
|
||||
if(index < 0 || index > size) {
|
||||
throw new ArrayIndexOutOfBoundsException(index);
|
||||
}
|
||||
if(index == 0) {
|
||||
addFirst(item);
|
||||
} else {
|
||||
Node<E> node = getNode(index - 1);
|
||||
addAfter(node, item);
|
||||
}
|
||||
|
||||
|
||||
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a new Node at the end of the list
|
||||
*
|
||||
* @param item The element to be added to the list
|
||||
* @return true if the element was successfully added, false otherwise
|
||||
*/
|
||||
public boolean add(E item) {
|
||||
add(size, item);
|
||||
return true;
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes a Node from the specified index
|
||||
* @param index The index of the Node to remove
|
||||
* @return The element removed from the list
|
||||
* @throws ArrayIndexOutOfBoundsException thrown when index is invalid
|
||||
*/
|
||||
public E remove(int index) throws ArrayIndexOutOfBoundsException {
|
||||
//TODO
|
||||
return removeAfter(getNode(index-1));
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the size (number of elements) in the list
|
||||
* @return The number of elements in the list
|
||||
*/
|
||||
public int size() {
|
||||
int s = 0;
|
||||
while (getNode(s) != null) {
|
||||
s++;
|
||||
}
|
||||
return s;
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the index of first instance of a specified element
|
||||
* @param item The specified element
|
||||
* @return The index of the first instance of the specified, -1 if not found
|
||||
*/
|
||||
public int indexOf(E item) {
|
||||
// TODO
|
||||
int index = 0;
|
||||
while (item != get(index) && index < size()-1) {
|
||||
index++;
|
||||
}
|
||||
if (item == get(index)) {
|
||||
return index;
|
||||
} else {
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns a String representation of the list, showing the next relationships with
|
||||
* a "==>"
|
||||
* @return The String representation of the list.
|
||||
*/
|
||||
@Override
|
||||
public String toString() {
|
||||
Node<E> node = head;
|
||||
StringBuilder result = new StringBuilder();
|
||||
while(node != null) {
|
||||
result.append(node.data);
|
||||
if(node.next != null) {
|
||||
result.append(" ==> ");
|
||||
}
|
||||
node = node.next;
|
||||
}
|
||||
return result.toString();
|
||||
}
|
||||
|
||||
/*
|
||||
* Helper method that finds and returns the Node at the specified index
|
||||
*/
|
||||
private Node<E> getNode(int index) {
|
||||
if(index < 0 || index > size) {
|
||||
throw new ArrayIndexOutOfBoundsException(index);
|
||||
}
|
||||
Node<E> node = head;
|
||||
for(int i = 0; i < index && node != null; i++) {
|
||||
node = node.next;
|
||||
}
|
||||
return node;
|
||||
}
|
||||
|
||||
/*
|
||||
* Helper method that adds an element after the specified Node. A new Node is
|
||||
* created, the element is assigned to the new Node, and that Node is set as
|
||||
* the next Node of the specified Node. The size is then incremented to reflect
|
||||
* the added Node.
|
||||
*/
|
||||
private void addAfter(Node<E> node, E item) {
|
||||
node.next = new Node<>(item, node.next);
|
||||
size++;
|
||||
}
|
||||
|
||||
/*
|
||||
* Helper method that removes the Node that follow (is the next of) a specified
|
||||
* Node. The specified Node's next is set to it's next Node's next. The size is
|
||||
* then decremented to reflect the removed Node.
|
||||
*
|
||||
* The removed Node is then returned.
|
||||
*/
|
||||
private E removeAfter(Node<E> node) {
|
||||
Node<E> temp = node.next;
|
||||
if (temp != null) {
|
||||
node.next = temp.next;
|
||||
size--;
|
||||
return temp.data;
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* Helper method that removes the head of the list. The head's next Node is
|
||||
* set as the new head of the list. The size is then decremented to reflect
|
||||
* the removed Node.
|
||||
*/
|
||||
private E removeFirst() {
|
||||
Node<E> temp = head;
|
||||
if (head != null) {
|
||||
size--;
|
||||
return temp.data;
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* A private class that wraps data in a Node object to be referenced by the list. Notice that
|
||||
* all methods, including constructors are private. Since this is a private class and only
|
||||
* exists inside the containing class, all private fields and methods are accessible by the
|
||||
* containing class.
|
||||
*/
|
||||
private static class Node<E> {
|
||||
private E data;
|
||||
private Node<E> next;
|
||||
|
||||
private Node(E dataItem) {
|
||||
this.data = dataItem;
|
||||
this.next = null;
|
||||
}
|
||||
|
||||
private Node(E dataItem, Node<E> next) {
|
||||
this.data = dataItem;
|
||||
this.next = next;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@@ -0,0 +1,31 @@
|
||||
/*
|
||||
* CS2852
|
||||
* Spring 2018
|
||||
* KWSingleLinkedList Driver
|
||||
* Name: Sean Jones
|
||||
* Created: 03/07/2018
|
||||
*/
|
||||
|
||||
package Week1;
|
||||
|
||||
public class KWSingleLinkedListDriver {
|
||||
public static void main(String[] args) {
|
||||
KWSingleLinkedList<String> names = new KWSingleLinkedList<>();
|
||||
names.addFirst("Alice");
|
||||
names.add("Bob");
|
||||
names.add("Charlie");
|
||||
names.add("Diane");
|
||||
names.add("Elaine");
|
||||
names.add("Fido");
|
||||
|
||||
System.out.println(names);
|
||||
System.out.println(names.get(3));
|
||||
System.out.println(names.set(5, "Frank"));
|
||||
names.add(4, "Ernie");
|
||||
System.out.println(names);
|
||||
names.remove(5);
|
||||
System.out.println(names.size());
|
||||
System.out.println(names.indexOf("Diane"));
|
||||
System.out.println(names);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,10 @@
|
||||
package Week5;
|
||||
|
||||
import java.util.Stack;
|
||||
|
||||
public class AdapterStack<E> {
|
||||
// Original
|
||||
private Stack<E> stack = new Stack<>();
|
||||
// Adapter Methods
|
||||
//public
|
||||
}
|
||||
@@ -0,0 +1,32 @@
|
||||
package Week5;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
public class KMStack<E> {
|
||||
// Backing Structure
|
||||
List<E> data;
|
||||
|
||||
// Constructor
|
||||
public KMStack() {
|
||||
data = new ArrayList();
|
||||
}
|
||||
// empty
|
||||
public boolean empty() {
|
||||
return data.isEmpty();
|
||||
}
|
||||
// peek
|
||||
public E peek() {
|
||||
return data.get(data.size() - 1);
|
||||
}
|
||||
// pop
|
||||
public E pop() {
|
||||
E temp = data.get(data.size()-1);
|
||||
data.remove(data.size()-1);
|
||||
return temp;
|
||||
}
|
||||
//push
|
||||
public boolean push(E element) {
|
||||
return data.add(element);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,31 @@
|
||||
package Week5;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Iterator;
|
||||
import java.util.LinkedList;
|
||||
import java.util.List;
|
||||
|
||||
public class Recursion {
|
||||
public static void main(String[] args) {
|
||||
List<Integer> list = new LinkedList<>();
|
||||
Iterator<Integer> it = list.iterator();
|
||||
for (int i = 0; i < 10; i++) {
|
||||
list.add((int)Math.random()* 10 + 1);
|
||||
}
|
||||
// size
|
||||
System.out.println(recursiveSize(it,0));
|
||||
// search
|
||||
|
||||
// greatest common divisor
|
||||
}
|
||||
public static int recursiveSize(Iterator<Integer> it, int count) {
|
||||
// base case
|
||||
if (!it.hasNext()) {
|
||||
return count;
|
||||
}
|
||||
// recursive call
|
||||
count++;
|
||||
it.next();
|
||||
return recursiveSize(it,count);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,20 @@
|
||||
package Week5;
|
||||
|
||||
public class StackDriver {
|
||||
public static void main(String[] args) {
|
||||
KMStack<Integer> stack = new KMStack<>();
|
||||
// test if empty
|
||||
System.out.println(stack.empty());
|
||||
// test add
|
||||
System.out.println(stack.push(5));
|
||||
System.out.println(stack.empty());
|
||||
System.out.println(stack.peek());
|
||||
stack.push(7);
|
||||
System.out.println(stack.peek());
|
||||
// test remove
|
||||
System.out.println(stack.pop());
|
||||
System.out.println(stack.peek());
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
@@ -0,0 +1,36 @@
|
||||
package Week6.BinaryTree;
|
||||
|
||||
import Week6.BinaryTree.BinarySearchTree;
|
||||
import Week6.BinaryTree.BinaryTree;
|
||||
|
||||
public class BSTDriver {
|
||||
public static void main(String[] args) {
|
||||
BinarySearchTree<Integer> tree = new BinarySearchTree<>();
|
||||
tree.add(13);
|
||||
tree.add(5);
|
||||
tree.add(18);
|
||||
tree.add(9);
|
||||
tree.add(1);
|
||||
tree.add(17);
|
||||
tree.add(8);
|
||||
tree.add(12);
|
||||
tree.add(3);
|
||||
tree.add(7);
|
||||
|
||||
tree.preOrderTraverse((e, f) -> System.out.println(e));
|
||||
// Week6.BinaryTree<Integer> tree2 = new Week6.BinaryTree(13,
|
||||
// new Week6.BinaryTree(new Week6.BinaryTree.Node(5)),
|
||||
// new Week6.BinaryTree(new Week6.BinaryTree.Node(18)));
|
||||
|
||||
// tree.delete(9);
|
||||
// System.out.println(tree);
|
||||
// System.out.println(tree.toList());
|
||||
// System.out.println(tree.size());
|
||||
// System.out.println(tree.contains(9));
|
||||
// System.out.println(tree.min());
|
||||
// System.out.println(tree.max());
|
||||
|
||||
// System.out.println(tree.minValue());
|
||||
// System.out.println(tree2.minValue());
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,284 @@
|
||||
package Week6.BinaryTree;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
/**
|
||||
* A class to represent a binary search tree.
|
||||
*
|
||||
* @param <E> The element type
|
||||
* @author Koffman and Wolfgang
|
||||
*/
|
||||
public class BinarySearchTree<E extends Comparable<E>> extends BinaryTree<E>
|
||||
implements SearchTree<E> {
|
||||
// Data Fields
|
||||
|
||||
/**
|
||||
* Return value from the public add method.
|
||||
*/
|
||||
protected boolean addReturn;
|
||||
/**
|
||||
* Return value from the public delete method.
|
||||
*/
|
||||
protected E deleteReturn;
|
||||
|
||||
private int size;
|
||||
|
||||
/**
|
||||
* Starter method find.
|
||||
*
|
||||
* @param target The Comparable object being sought
|
||||
* @return The object, if found, otherwise null
|
||||
*/
|
||||
@Override
|
||||
public E find(E target) {
|
||||
return find(root, target);
|
||||
}
|
||||
|
||||
/**
|
||||
* Recursive find method.
|
||||
*
|
||||
* @param localRoot The local subtree�s root
|
||||
* @param target The object being sought
|
||||
* @return The object, if found, otherwise null
|
||||
*/
|
||||
private E find(Node<E> localRoot, E target) {
|
||||
if(localRoot == null) {
|
||||
return null;
|
||||
}
|
||||
int result = target.compareTo(localRoot.data);
|
||||
|
||||
if(result == 0) {
|
||||
return localRoot.data;
|
||||
} else if (result < 0) {
|
||||
return find(localRoot.left, target);
|
||||
} else {
|
||||
return find(localRoot.right, target);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Starter method add.
|
||||
*
|
||||
* @param item The object being inserted
|
||||
* @return true if the object is inserted, false if the object already
|
||||
* exists in the tree
|
||||
*/
|
||||
@Override
|
||||
public boolean add(E item) {
|
||||
root = add(root, item);
|
||||
return addReturn;
|
||||
}
|
||||
|
||||
/**
|
||||
* Recursive add method.
|
||||
*
|
||||
* @post The data field addReturn is set true if the item is added to the
|
||||
* tree, false if the item is already in the tree.
|
||||
* @param localRoot The local root of the subtree
|
||||
* @param item The object to be inserted
|
||||
* @return The new local root that now contains the inserted item
|
||||
*/
|
||||
private Node<E> add(Node<E> localRoot, E item) {
|
||||
if(localRoot == null) {
|
||||
addReturn = true;
|
||||
return new Node<>(item);
|
||||
} else if (item.compareTo(localRoot.data) == 0) {
|
||||
addReturn = false;
|
||||
return localRoot;
|
||||
} else if (item.compareTo(localRoot.data) < 0) {
|
||||
localRoot.left = add(localRoot.left, item);
|
||||
return localRoot;
|
||||
} else {
|
||||
localRoot.right = add(localRoot.right, item);
|
||||
return localRoot;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Starter method delete.
|
||||
*
|
||||
* @post The object is not in the tree.
|
||||
* @param target The object to be deleted
|
||||
* @return The object deleted from the tree or null if the object was not in
|
||||
* the tree
|
||||
*/
|
||||
@Override
|
||||
public E delete(E target) {
|
||||
root = delete(root, target);
|
||||
return deleteReturn;
|
||||
}
|
||||
|
||||
/**
|
||||
* Recursive delete method.
|
||||
*
|
||||
* @post The item is not in the tree; deleteReturn is equal to the deleted
|
||||
* item as it was stored in the tree or null if the item was not found.
|
||||
* @param localRoot The root of the current subtree
|
||||
* @param item The item to be deleted
|
||||
* @return The modified local root that does not contain the item
|
||||
*/
|
||||
private Node<E> delete(Node<E> localRoot, E item) {
|
||||
if(localRoot == null) {
|
||||
deleteReturn = null;
|
||||
return localRoot;
|
||||
}
|
||||
int result = item.compareTo(localRoot.data);
|
||||
if(result < 0) {
|
||||
localRoot.left = delete(localRoot.left, item);
|
||||
return localRoot;
|
||||
} else if (result > 0) {
|
||||
localRoot.right = delete(localRoot.right, item);
|
||||
return localRoot;
|
||||
} else {
|
||||
deleteReturn = localRoot.data;
|
||||
if(localRoot.left == null) {
|
||||
return localRoot.right;
|
||||
} else if (localRoot.right == null) {
|
||||
return localRoot.left;
|
||||
} else {
|
||||
// 2 children
|
||||
if(localRoot.left.right == null) {
|
||||
localRoot.data = localRoot.left.data;
|
||||
localRoot.left = localRoot.left.left;
|
||||
return localRoot;
|
||||
} else {
|
||||
localRoot.data = findLargestChild(localRoot.left);
|
||||
return localRoot;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Find the node that is the in-order predecessor and replace it with its
|
||||
* left child (if any).
|
||||
*
|
||||
* @post The in-order predecessor is removed from the tree.
|
||||
* @param parent The parent of possible in-order predecessor (ip)
|
||||
* @return The data in the ip
|
||||
*/
|
||||
private E findLargestChild(Node<E> parent) {
|
||||
if(parent.right.right == null) {
|
||||
E returnValue = parent.right.data;
|
||||
parent.right = parent.right.left;
|
||||
return returnValue;
|
||||
} else {
|
||||
return findLargestChild(parent.right);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Removes target from tree.
|
||||
*
|
||||
* @param target Item to be removed
|
||||
* @return true if the object was in the tree, false otherwise
|
||||
* @post target is not in the tree
|
||||
*/
|
||||
@Override
|
||||
public boolean remove(E target) {
|
||||
return delete(target) != null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Determine if an item is in the tree
|
||||
*
|
||||
* @param target Item being sought in tree
|
||||
* @return true If the item is in the tree, false otherwise
|
||||
* @throws ClassCastException if target is not Comparable
|
||||
*/
|
||||
@Override
|
||||
public boolean contains(E target) {
|
||||
return find(target) != null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Find the node that is the in-order successor and replace it with its
|
||||
* right child (if any).
|
||||
*
|
||||
* @post The in-order successor is removed from the tree.
|
||||
* @param parent The parent of possible in-order successor (is)
|
||||
* @return The data in the is
|
||||
*/
|
||||
private E findSmallestChild(Node<E> parent) {
|
||||
if(parent.left.left == null) {
|
||||
E returnValue = parent.left.data;
|
||||
parent.left = parent.left.right;
|
||||
return returnValue;
|
||||
} else {
|
||||
return findSmallestChild(parent.left);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the size of the tree.
|
||||
* @return the number of nodes with non-null data in the tree
|
||||
*/
|
||||
public int size() {
|
||||
size = 0;
|
||||
inOrderTraverse((e, d) -> { if (e != null) {
|
||||
++size;
|
||||
}
|
||||
});
|
||||
return size;
|
||||
}
|
||||
|
||||
public E minValue() {
|
||||
return minimum(root);
|
||||
}
|
||||
|
||||
private E minimum(Node<E> node) {
|
||||
if(node == null) {
|
||||
return null;
|
||||
}
|
||||
if(node.left == null) {
|
||||
return node.data;
|
||||
}
|
||||
return minimum(node.left);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the smallest data value contained in the tree
|
||||
* @return The smallest value
|
||||
*/
|
||||
public E min() {
|
||||
return findSmallestChild(root);
|
||||
}
|
||||
|
||||
/**
|
||||
* Returns the largest data value contained in the tree
|
||||
* @return The largest value
|
||||
*/
|
||||
public E max() {
|
||||
return findLargestChild(root);
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the contents of the BinarySearchTree as a List of items in
|
||||
* ascending order. (Note the exercise suggests returning a string of item
|
||||
* separated by newline characters, but a List is more general and useful
|
||||
* for the testing performed by the exercise. Also, the toString method of
|
||||
* the Week6.BinaryTree class would be hidden and it is useful to verify some of
|
||||
* the tests.
|
||||
*
|
||||
* @return A list containing the contents of the binary search tree
|
||||
*/
|
||||
@Override
|
||||
public List<E> toList() {
|
||||
List<E> result = new ArrayList<>();
|
||||
inOrderTraverse((e, d)-> {
|
||||
if(e != null) {
|
||||
result.add(e);
|
||||
}
|
||||
});
|
||||
return result;
|
||||
}
|
||||
|
||||
/**
|
||||
* Empty this BinarySearchTree
|
||||
*/
|
||||
public void clear() {
|
||||
root = null;
|
||||
}
|
||||
|
||||
}
|
||||
@@ -0,0 +1,273 @@
|
||||
package Week6.BinaryTree;
|
||||
|
||||
import java.io.Serializable;
|
||||
import java.util.Scanner;
|
||||
import java.util.function.BiConsumer;
|
||||
|
||||
/**
|
||||
* Class for a binary tree that stores type E objects.
|
||||
*
|
||||
* @param <E> The element type
|
||||
* @author Koffman and Wolfgang
|
||||
*
|
||||
*/
|
||||
public class BinaryTree<E extends Comparable<E>> implements Serializable {
|
||||
/**
|
||||
* Class to encapsulate a tree node.
|
||||
*
|
||||
* @param <E> The element type
|
||||
*/
|
||||
protected static class Node<E extends Comparable<E>> implements Serializable {
|
||||
// Data Fields
|
||||
|
||||
/**
|
||||
* The information stored in this node.
|
||||
*/
|
||||
public E data;
|
||||
/**
|
||||
* Reference to the left child.
|
||||
*/
|
||||
public Node<E> left;
|
||||
/**
|
||||
* Reference to the right child.
|
||||
*/
|
||||
public Node<E> right;
|
||||
|
||||
// Constructors
|
||||
|
||||
/**
|
||||
* Construct a node with given data and no children.
|
||||
*
|
||||
* @param data The data to store in this node
|
||||
*/
|
||||
public Node(E data) {
|
||||
this.data = data;
|
||||
left = null;
|
||||
right = null;
|
||||
}
|
||||
|
||||
// Methods
|
||||
|
||||
/**
|
||||
* Returns a string representation of the node.
|
||||
*
|
||||
* @return A string representation of the data fields
|
||||
*/
|
||||
@Override
|
||||
public String toString() {
|
||||
return data.toString();
|
||||
}
|
||||
|
||||
}
|
||||
// Data Field
|
||||
/**
|
||||
* The root of the binary tree
|
||||
*/
|
||||
protected Node<E> root;
|
||||
|
||||
/**
|
||||
* Construct an empty Week6.BinaryTree
|
||||
*/
|
||||
public BinaryTree() {
|
||||
this.root = null;
|
||||
}
|
||||
|
||||
/**
|
||||
* Construct a Week6.BinaryTree with a specified root. Should only be used by
|
||||
* subclasses.
|
||||
*
|
||||
* @param root The node that is the root of the tree.
|
||||
*/
|
||||
protected BinaryTree(Node<E> root) {
|
||||
this.root = root;
|
||||
}
|
||||
|
||||
/**
|
||||
* Constructs a new binary tree with data in its root,leftTree as its left
|
||||
* subtree and rightTree as its right subtree.
|
||||
*
|
||||
* @param data The data item to store in the root
|
||||
* @param leftTree the left child
|
||||
* @param rightTree the right child
|
||||
*/
|
||||
public BinaryTree(E data, BinaryTree<E> leftTree,
|
||||
BinaryTree<E> rightTree) {
|
||||
root = new Node<E>(data);
|
||||
if (leftTree != null) {
|
||||
this.root.left = leftTree.root;
|
||||
} else {
|
||||
this.root.left = null;
|
||||
}
|
||||
if (rightTree != null) {
|
||||
this.root.right = rightTree.root;
|
||||
} else {
|
||||
this.root.right = null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the left subtree.
|
||||
*
|
||||
* @return The left subtree or null if either the root or the left subtree
|
||||
* is null
|
||||
*/
|
||||
public BinaryTree<E> getLeftSubtree() {
|
||||
if (this.root != null && this.root.left != null) {
|
||||
return new BinaryTree<E>(this.root.left);
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the right sub-tree
|
||||
*
|
||||
* @return the right sub-tree or null if either the root or the right
|
||||
* subtree is null.
|
||||
*/
|
||||
public BinaryTree<E> getRightSubtree() {
|
||||
if (this.root != null && this.root.right != null) {
|
||||
return new BinaryTree<E>(this.root.right);
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Return the data field of the root
|
||||
*
|
||||
* @return the data field of the root or null if the root is null
|
||||
*/
|
||||
public E getData() {
|
||||
if (this.root != null) {
|
||||
return root.data;
|
||||
} else {
|
||||
return null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Determine whether this tree is a leaf.
|
||||
*
|
||||
* @return true if the root has no children
|
||||
*/
|
||||
public boolean isLeaf() {
|
||||
return this.root == null || this.root.left == null
|
||||
&& this.root.right == null;
|
||||
}
|
||||
|
||||
@Override
|
||||
public String toString() {
|
||||
final StringBuilder sb = new StringBuilder();
|
||||
inOrderTraverse((e, d) -> {
|
||||
for (int i = 1; i < d; i++) {
|
||||
sb.append(" ");
|
||||
}
|
||||
sb.append(e);
|
||||
sb.append("\n");
|
||||
});
|
||||
return sb.toString();
|
||||
}
|
||||
|
||||
|
||||
/*<listing chapter="6" section="4">
|
||||
/**
|
||||
* Starter method for preorder traversal
|
||||
* @param consumer an object that instantiates the BiConsumer interface.
|
||||
* Its method implements the abstract method apply.
|
||||
*/
|
||||
public void preOrderTraverse(BiConsumer<E, Integer> consumer) {
|
||||
preOrderTraverse(root, 1, consumer);
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs a recursive pre-order traversal of the tree,
|
||||
* applying the action specified in the consumer object.
|
||||
* @param node The local root
|
||||
* @param depth The depth
|
||||
* @param consumer object whose accept method specifies the action
|
||||
* to be performed on each node.
|
||||
*/
|
||||
private void preOrderTraverse(Node<E> node, int depth,
|
||||
BiConsumer<E, Integer> consumer) {
|
||||
if(node == null) {
|
||||
consumer.accept(null, depth);
|
||||
} else {
|
||||
consumer.accept(node.data, depth);
|
||||
preOrderTraverse(node.left, depth + 1, consumer);
|
||||
preOrderTraverse(node.right, depth + 1, consumer);
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Starter method for inorder traversal
|
||||
* @param consumer an object that instantiates the BiConsumer interface.
|
||||
* Its method implements the abstract method apply.
|
||||
*/
|
||||
public void inOrderTraverse(BiConsumer<E, Integer> consumer) {
|
||||
inOrderTraverse(root, 1, consumer);
|
||||
}
|
||||
|
||||
/**
|
||||
* Performs a recursive inorder traversal of the tree,
|
||||
* applying the action specified in the consumer object.
|
||||
* @param node The local root
|
||||
* @param depth The depth
|
||||
* @param consumer object whose accept method specifies the action
|
||||
* to be performed on each node.
|
||||
*/
|
||||
private void inOrderTraverse(Node<E> node, int depth,
|
||||
BiConsumer<E, Integer> consumer) {
|
||||
if(node == null) {
|
||||
consumer.accept(null, depth);
|
||||
} else {
|
||||
inOrderTraverse(node.left, depth + 1, consumer);
|
||||
consumer.accept(node.data, depth);
|
||||
inOrderTraverse(node.right, depth + 1, consumer);
|
||||
}
|
||||
}
|
||||
|
||||
public E minValue() {
|
||||
return minimum(root);
|
||||
}
|
||||
|
||||
private E minimum(Node<E> node) {
|
||||
if(node == null) {
|
||||
return null;
|
||||
}
|
||||
|
||||
E min = node.data;
|
||||
E left = null;
|
||||
E right = null;
|
||||
|
||||
if(node.left != null) {
|
||||
left = minimum(node.left);
|
||||
}
|
||||
if(node.right != null) {
|
||||
right = minimum(node.right);
|
||||
}
|
||||
if(left != null && left.compareTo(min) < 0) {
|
||||
return left;
|
||||
}
|
||||
if(right != null && right.compareTo(min) < 0) {
|
||||
return right;
|
||||
}
|
||||
return min;
|
||||
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to read a binary tree.
|
||||
*
|
||||
* @pre The input consists of a pre-order traversal of the binary tree. The
|
||||
* line "null" indicates a null tree.
|
||||
* @param scan the Scanner attached to the input file
|
||||
* @return The binary tree
|
||||
*/
|
||||
public static BinaryTree<String> readBinaryTree(Scanner scan) {
|
||||
// Read a line and trim leading and trailing spaces.
|
||||
//TODO
|
||||
return null;
|
||||
}
|
||||
}
|
||||
/*</listing>*/
|
||||
@@ -0,0 +1,72 @@
|
||||
package Week6.BinaryTree;
|
||||
|
||||
import java.util.List;
|
||||
|
||||
/**
|
||||
* Interface to define a search tree
|
||||
*
|
||||
* @param <E> The element type
|
||||
* @author Koffman and Wolfgang
|
||||
*
|
||||
*/
|
||||
public interface SearchTree<E extends Comparable<E>> {
|
||||
|
||||
/**
|
||||
* Inserts item where it belongs in the tree.
|
||||
*
|
||||
* @param item The item to be inserted
|
||||
* @return true If the item is inserted, false if the item was already in
|
||||
* the tree.
|
||||
*/
|
||||
boolean add(E item);
|
||||
|
||||
/**
|
||||
* Determine if an item is in the tree
|
||||
*
|
||||
* @param target Item being sought in tree
|
||||
* @return true If the item is in the tree, false otherwise
|
||||
*/
|
||||
boolean contains(E target);
|
||||
|
||||
/**
|
||||
* Find an object in the tree
|
||||
*
|
||||
* @param target The item being sought
|
||||
* @return A reference to the object in the tree that compares equal as
|
||||
* determined by compareTo to the target. If not found null is returned.
|
||||
*/
|
||||
E find(E target);
|
||||
|
||||
/**
|
||||
* Removes target from tree.
|
||||
*
|
||||
* @param target Item to be removed
|
||||
* @return A reference to the object in the tree that compares equal as
|
||||
* determined by compareTo to the target. If not found null is returned.
|
||||
* @post target is not in the tree
|
||||
*/
|
||||
E delete(E target);
|
||||
|
||||
/**
|
||||
* Removes target from tree.
|
||||
*
|
||||
* @param target Item to be removed
|
||||
* @return true if the object was in the tree, false otherwise
|
||||
* @post target is not in the tree
|
||||
*/
|
||||
boolean remove(E target);
|
||||
|
||||
/**
|
||||
* Return a list containing the contents of the search tree in ascending
|
||||
* order.
|
||||
*
|
||||
* @return a list containing the contents of the search tree in ascending
|
||||
* order.
|
||||
*/
|
||||
List<E> toList();
|
||||
|
||||
/**
|
||||
* Empty this SearchTree
|
||||
*/
|
||||
void clear();
|
||||
}
|
||||
@@ -0,0 +1,491 @@
|
||||
package Week9.AVLTree;
|
||||
|
||||
/**
|
||||
* Self-balancing binary search tree using the algorithm defined
|
||||
* by Adelson-Velskii and Landis.
|
||||
* @param <E> The element type
|
||||
* @author Koffman and Wolfgang
|
||||
*/
|
||||
public class AVLTree<E extends Comparable<E>> extends BinarySearchTreeWithRotate<E> {
|
||||
|
||||
// Insert nested class AVLNode<E> here.
|
||||
/** Class to represent an AVL Node. It extends the
|
||||
* Week6.BinaryTree.Node by adding the balance field.
|
||||
*/
|
||||
private static class AVLNode<E extends Comparable<E>> extends Node<E> {
|
||||
|
||||
/** Constant to indicate left-heavy */
|
||||
public static final int LEFT_HEAVY = -1;
|
||||
/** Constant to indicate balanced */
|
||||
public static final int BALANCED = 0;
|
||||
/** Constant to indicate right-heavy */
|
||||
public static final int RIGHT_HEAVY = 1;
|
||||
/** balance is right subtree height - left subtree height */
|
||||
private int balance;
|
||||
|
||||
// Methods
|
||||
/**
|
||||
* Construct a node with the given item as the data field.
|
||||
* @param item The data field
|
||||
*/
|
||||
public AVLNode(E item) {
|
||||
super(item);
|
||||
balance = BALANCED;
|
||||
}
|
||||
|
||||
/**
|
||||
* Return a string representation of this object.
|
||||
* The balance value is appended to the contents.
|
||||
* @return String representation of this object
|
||||
*/
|
||||
@Override
|
||||
public String toString() {
|
||||
return balance + ": " + super.toString();
|
||||
}
|
||||
}
|
||||
|
||||
// Data Fields
|
||||
/** Flag to indicate that height of tree has increased. */
|
||||
private boolean increase;
|
||||
|
||||
/** Flag to indicate that height of tree has decreased */
|
||||
private boolean decrease;
|
||||
/*</exercise>*/
|
||||
|
||||
// Methods
|
||||
/**
|
||||
* add starter method.
|
||||
* @pre the item to insert implements the Comparable interface.
|
||||
* @param item The item being inserted.
|
||||
* @return true if the object is inserted; false
|
||||
* if the object already exists in the tree
|
||||
* @throws ClassCastException if item is not Comparable
|
||||
*/
|
||||
@Override
|
||||
public boolean add(E item) {
|
||||
increase = false;
|
||||
root = add((AVLNode<E>) root, item);
|
||||
return addReturn;
|
||||
}
|
||||
|
||||
/**
|
||||
* Recursive add method. Inserts the given object into the tree.
|
||||
* @post addReturn is set true if the item is inserted,
|
||||
* false if the item is already in the tree.
|
||||
* @param localRoot The local root of the subtree
|
||||
* @param item The object to be inserted
|
||||
* @return The new local root of the subtree with the item
|
||||
* inserted
|
||||
*/
|
||||
private AVLNode<E> add(AVLNode<E> localRoot, E item) {
|
||||
if (localRoot == null) {
|
||||
addReturn = true;
|
||||
increase = true;
|
||||
return new AVLNode<>(item);
|
||||
}
|
||||
|
||||
if (item.compareTo(localRoot.data) == 0) {
|
||||
// Item is already in the tree.
|
||||
increase = false;
|
||||
addReturn = false;
|
||||
return localRoot;
|
||||
} else if (item.compareTo(localRoot.data) < 0) {
|
||||
// item < data
|
||||
localRoot.left = add((AVLNode<E>) localRoot.left, item);
|
||||
|
||||
if (increase) {
|
||||
decrementBalance(localRoot);
|
||||
if (localRoot.balance < AVLNode.LEFT_HEAVY) {
|
||||
increase = false;
|
||||
return rebalanceLeft(localRoot);
|
||||
}
|
||||
}
|
||||
return localRoot; // Rebalance not needed.
|
||||
} else { // item > data
|
||||
//TODO: Implement case where item.compareTo(localRoot.data) > 0
|
||||
localRoot.right = add((AVLNode<E>) localRoot.right, item);
|
||||
if (decrease) {
|
||||
incrementBalance(localRoot);
|
||||
if (localRoot.balance < AVLNode.RIGHT_HEAVY) {
|
||||
decrease = false;
|
||||
return rebalanceRight(localRoot);
|
||||
}
|
||||
}
|
||||
return localRoot;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to rebalance left.
|
||||
* @pre localRoot is the root of an AVL subtree that is
|
||||
* critically left-heavy.
|
||||
* @post Balance is restored.
|
||||
* @param localRoot Root of the AVL subtree
|
||||
* that needs rebalancing
|
||||
* @return a new localRoot
|
||||
*/
|
||||
private AVLNode<E> rebalanceLeft(AVLNode<E> localRoot) {
|
||||
// Obtain reference to left child.
|
||||
AVLNode<E> leftChild = (AVLNode<E>) localRoot.left;
|
||||
// See whether left-right heavy.
|
||||
if (leftChild.balance > AVLNode.BALANCED) {
|
||||
// Obtain reference to left-right child.
|
||||
AVLNode<E> leftRightChild = (AVLNode<E>) leftChild.right;
|
||||
// Adjust the balances to be their new values after
|
||||
// the rotations are performed.
|
||||
if (leftRightChild.balance < AVLNode.BALANCED) {
|
||||
leftChild.balance = AVLNode.LEFT_HEAVY;
|
||||
leftRightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
} else if (leftRightChild.balance > AVLNode.BALANCED) {
|
||||
leftChild.balance = AVLNode.BALANCED;
|
||||
leftRightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.RIGHT_HEAVY;
|
||||
} else {
|
||||
leftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
}
|
||||
// Perform left rotation.
|
||||
localRoot.left = rotateLeft(leftChild);
|
||||
} else { //Left-Left case
|
||||
// In this case the leftChild (the new root)
|
||||
// and the root (new right child) will both be balanced
|
||||
// after the rotation.
|
||||
leftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
}
|
||||
// Now rotate the local root right.
|
||||
return (AVLNode<E>) rotateRight(localRoot);
|
||||
}
|
||||
/*</listing>*/
|
||||
|
||||
/**
|
||||
* Method to rebalance right.
|
||||
* @pre localRoot is the root of an AVL subtree that is
|
||||
* critically right-heavy.
|
||||
* @post Balance is restored.
|
||||
* @param localRoot Root of the AVL subtree
|
||||
* that needs rebalancing
|
||||
* @return a new localRoot
|
||||
*/
|
||||
private AVLNode<E> rebalanceRight(AVLNode<E> localRoot) {
|
||||
AVLNode<E> rightChild = (AVLNode<E>) localRoot.right;
|
||||
|
||||
if (rightChild.balance < AVLNode.BALANCED) {
|
||||
AVLNode<E> rightLeftChild = (AVLNode<E>) rightChild.left;
|
||||
|
||||
if (rightLeftChild.balance > AVLNode.BALANCED) {
|
||||
rightChild.balance = AVLNode.RIGHT_HEAVY;
|
||||
rightLeftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
|
||||
} else if (rightLeftChild.balance < AVLNode.BALANCED) {
|
||||
rightChild.balance = AVLNode.BALANCED;
|
||||
rightLeftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.LEFT_HEAVY;
|
||||
|
||||
} else {
|
||||
rightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
|
||||
}
|
||||
localRoot.right = rotateRight(rightChild);
|
||||
|
||||
} else {
|
||||
rightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
|
||||
}
|
||||
|
||||
return (AVLNode<E>) rotateLeft(localRoot);
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to decrement the balance field and to reset the value of
|
||||
* increase.
|
||||
* @pre The balance field was correct prior to an insertion [or
|
||||
* removal,] and an item is either been added to the left[
|
||||
* or removed from the right].
|
||||
* @post The balance is decremented and the increase flags is set
|
||||
* to false if the overall height of this subtree has not
|
||||
* changed.
|
||||
* @param node The AVL node whose balance is to be incremented
|
||||
*/
|
||||
private void decrementBalance(AVLNode<E> node) {
|
||||
// Decrement the balance.
|
||||
node.balance--;
|
||||
if (node.balance == AVLNode.BALANCED) {
|
||||
// If now balanced, overall height has not increased.
|
||||
increase = false;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to increment the balance field and to reset the value of
|
||||
* increase.
|
||||
* @pre The balance field was correct prior to an insertion [or
|
||||
* removal,] and an item is either been added to the right[ or removed
|
||||
* from the left].
|
||||
* @post The balance is incremented and the increase flags is set to
|
||||
* false if the overall height of this subtree has not changed.
|
||||
* @param node The AVL node whose balance is to be incremented
|
||||
*/
|
||||
private void incrementBalance(AVLNode<E> node) {
|
||||
node.balance++;
|
||||
if (node.balance == AVLNode.BALANCED) {
|
||||
decrease = false;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Delete starter method. Removes the given object
|
||||
* from the AVL tree.
|
||||
* @post The object is not in the tree
|
||||
* @param item - The object to be removed.
|
||||
* @return The object from the tree that was removed
|
||||
* or null if the object was not in the tree.
|
||||
*/
|
||||
@Override
|
||||
public E delete(E item) {
|
||||
decrease = false;
|
||||
root = delete((AVLNode<E>) root, item);
|
||||
return deleteReturn;
|
||||
}
|
||||
|
||||
/**
|
||||
* Recursive delete method. Removes the given object
|
||||
* from the AVL tree.
|
||||
* @post The object is not in the tree and removeReturn
|
||||
* is set to the object that was removed, otherwise
|
||||
* it is set false.
|
||||
* @param localRoot The root of the local subtree
|
||||
* @param item The item to be removed
|
||||
* @return The new root of the local subtree with the item
|
||||
* removed.
|
||||
*/
|
||||
private AVLNode<E> delete(AVLNode<E> localRoot, E item) {
|
||||
if (localRoot == null) { // item is not in tree
|
||||
deleteReturn = null;
|
||||
return localRoot;
|
||||
}
|
||||
if (item.compareTo(localRoot.data) == 0) {
|
||||
// item is in the tree -- need to remove it
|
||||
deleteReturn = localRoot.data;
|
||||
return findReplacementNode(localRoot);
|
||||
} else if (item.compareTo(localRoot.data) < 0) {
|
||||
// item is < localRoot.data
|
||||
localRoot.left = delete((AVLNode<E>) localRoot.left, item);
|
||||
if (decrease) {
|
||||
incrementBalance(localRoot);
|
||||
if (localRoot.balance > AVLNode.RIGHT_HEAVY) {
|
||||
return rebalanceRightL(localRoot);
|
||||
} else {
|
||||
return localRoot;
|
||||
}
|
||||
} else {
|
||||
return localRoot;
|
||||
}
|
||||
} else {
|
||||
// item is > localRoot.data
|
||||
localRoot.right = delete((AVLNode<E>) localRoot.right, item);
|
||||
if (decrease) {
|
||||
decrementBalance(localRoot);
|
||||
if (localRoot.balance < AVLNode.LEFT_HEAVY) {
|
||||
return rebalanceLeftR(localRoot);
|
||||
} else {
|
||||
return localRoot;
|
||||
}
|
||||
} else {
|
||||
return localRoot;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Function to find a replacement for a node that is being
|
||||
* deleted from a binary search tree. If the node has a null
|
||||
* child, then the replacement is the other child. If neither
|
||||
* are null, then the replacement is the largest value less
|
||||
* than the item being removed.
|
||||
* @pre node is not null
|
||||
* @post a node is deleted from the tree
|
||||
* @param node The node to be deleted or replaced
|
||||
* @return null if both of node's children are null
|
||||
* node.left if node.right is null
|
||||
* node.right if node.left is null
|
||||
* modified copy of node with its data field changed
|
||||
*/
|
||||
private AVLNode<E> findReplacementNode(AVLNode<E> node) {
|
||||
if (node.left == null) {
|
||||
decrease = true;
|
||||
return (AVLNode<E>) node.right;
|
||||
} else if (node.right == null) {
|
||||
decrease = true;
|
||||
return (AVLNode<E>) node.left;
|
||||
} else {
|
||||
if (node.left.right == null) {
|
||||
node.data = node.left.data;
|
||||
node.left = node.left.left;
|
||||
incrementBalance(node);
|
||||
return node;
|
||||
} else {
|
||||
node.data = findLargestChild((AVLNode<E>) node.left);
|
||||
if (((AVLNode<E>) node.left).balance < AVLNode.LEFT_HEAVY) {
|
||||
node.left = rebalanceLeft((AVLNode<E>) node.left);
|
||||
}
|
||||
if (decrease) {
|
||||
incrementBalance(node);
|
||||
}
|
||||
return node;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Find the node such that parent.right.right == null
|
||||
* @post The found node is removed from the tree and replaced
|
||||
* by its left child (if any)
|
||||
* @param parent - The possible parent
|
||||
* @return the value of the found node
|
||||
*/
|
||||
private E findLargestChild(AVLNode<E> parent) {
|
||||
if (parent.right.right == null) {
|
||||
E returnValue = parent.right.data;
|
||||
parent.right = parent.right.left;
|
||||
decrementBalance(parent);
|
||||
return returnValue;
|
||||
} else {
|
||||
E returnValue = findLargestChild((AVLNode<E>) parent.right);
|
||||
if (((AVLNode<E>) parent.right).balance < AVLNode.LEFT_HEAVY) {
|
||||
parent.right = rebalanceLeft((AVLNode<E>) parent.right);
|
||||
}
|
||||
if (decrease) {
|
||||
decrementBalance(parent);
|
||||
}
|
||||
return returnValue;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Rebalance Left with support for deletion
|
||||
* @pre localRoot is the root of an AVL subtree that is
|
||||
* more than one left heavy.
|
||||
* @post balance is restored and increase and decrease
|
||||
* are updated as required
|
||||
* @param localRoot Root of the AVL subtree that needs rebalancing
|
||||
* @return a new localRoot
|
||||
*/
|
||||
private AVLNode<E> rebalanceLeftR(AVLNode<E> localRoot) {
|
||||
// Obtain reference to left child
|
||||
AVLNode<E> leftChild = (AVLNode<E>) localRoot.left;
|
||||
// See if left-right heavy
|
||||
if (leftChild.balance > AVLNode.BALANCED) {
|
||||
// Obtain reference to left-right child
|
||||
AVLNode<E> leftRightChild = (AVLNode<E>) leftChild.right;
|
||||
// Adjust the balances to be their new values after
|
||||
// the rotates are performed.
|
||||
if (leftRightChild.balance < AVLNode.BALANCED) {
|
||||
leftChild.balance = AVLNode.LEFT_HEAVY;
|
||||
leftRightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
} else if (leftRightChild.balance > AVLNode.BALANCED) {
|
||||
leftChild.balance = AVLNode.BALANCED;
|
||||
leftRightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.RIGHT_HEAVY;
|
||||
} else {
|
||||
leftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
}
|
||||
// After the rotates the overall height will be
|
||||
// reduced thus increase is now false, but
|
||||
// decrease is now true.
|
||||
increase = false;
|
||||
decrease = true;
|
||||
// Perform double rotation
|
||||
localRoot.left = rotateLeft(leftChild);
|
||||
return (AVLNode<E>) rotateRight(localRoot);
|
||||
}
|
||||
if (leftChild.balance < AVLNode.BALANCED) {
|
||||
// In this case both the leftChild (the new root)
|
||||
// and the root (new right child) will both be balanced
|
||||
// after the rotate. Also the overall height will be
|
||||
// reduced, thus increase will be false, but decrease
|
||||
// will be true.
|
||||
leftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
increase = false;
|
||||
decrease = true;
|
||||
} else {
|
||||
// After the rotate the leftChild (new root) will
|
||||
// be right heavy, and the local root (new right child)
|
||||
// will be left heavy. The overall height of the tree
|
||||
// will not change, thus increase and decrease remain
|
||||
// unchanged.
|
||||
leftChild.balance = AVLNode.RIGHT_HEAVY;
|
||||
localRoot.balance = AVLNode.LEFT_HEAVY;
|
||||
}
|
||||
// Now rotate the
|
||||
return (AVLNode<E>) rotateRight(localRoot);
|
||||
}
|
||||
|
||||
/**
|
||||
* Rebalance Right with support for deletion
|
||||
* @pre localRoot is the root of an AVL subtree that is
|
||||
* more than one right heavy.
|
||||
* @post balance is restored and increase is set false
|
||||
* @param localRoot Root of the AVL subtree that needs rebalancing
|
||||
* @return a new localRoot
|
||||
*/
|
||||
private AVLNode<E> rebalanceRightL(AVLNode<E> localRoot) {
|
||||
// Obtain reference to right child
|
||||
AVLNode<E> rightChild = (AVLNode<E>) localRoot.right;
|
||||
// See if right-left heavy
|
||||
if (rightChild.balance < AVLNode.BALANCED) {
|
||||
// Obtain reference to right-left child
|
||||
AVLNode<E> rightLeftChild = (AVLNode<E>) rightChild.left;
|
||||
// Adjust the balances to be their new values after
|
||||
// the rotates are performed.
|
||||
if (rightLeftChild.balance > AVLNode.BALANCED) {
|
||||
rightChild.balance = AVLNode.RIGHT_HEAVY;
|
||||
rightLeftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
} else if (rightLeftChild.balance < AVLNode.BALANCED) {
|
||||
rightChild.balance = AVLNode.BALANCED;
|
||||
rightLeftChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.LEFT_HEAVY;
|
||||
} else {
|
||||
rightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
}
|
||||
// After the rotates the overall height will be
|
||||
// reduced thus increase is now false, but
|
||||
// decrease is now true.
|
||||
increase = false;
|
||||
decrease = true;
|
||||
// Perform double rotation
|
||||
localRoot.right = rotateRight(rightChild);
|
||||
return (AVLNode<E>) rotateLeft(localRoot);
|
||||
}
|
||||
if (rightChild.balance > AVLNode.BALANCED) {
|
||||
// In this case both the rightChild (the new root)
|
||||
// and the root (new left child) will both be balanced
|
||||
// after the rotate. Also the overall height will be
|
||||
// reduced, thus increase will be false, but decrease
|
||||
// will be true.
|
||||
rightChild.balance = AVLNode.BALANCED;
|
||||
localRoot.balance = AVLNode.BALANCED;
|
||||
increase = false;
|
||||
decrease = true;
|
||||
} else {
|
||||
// After the rotate the rightChild (new root) will
|
||||
// be left heavy, and the local root (new left child)
|
||||
// will be right heavy. The overall height of the tree
|
||||
// will not change, thus increase and decrease remain
|
||||
// unchanged.
|
||||
rightChild.balance = AVLNode.LEFT_HEAVY;
|
||||
localRoot.balance = AVLNode.RIGHT_HEAVY;
|
||||
}
|
||||
// Now rotate the
|
||||
return (AVLNode<E>) rotateLeft(localRoot);
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,51 @@
|
||||
package Week9.AVLTree;
|
||||
|
||||
import Week6.BinaryTree.BinarySearchTree;
|
||||
|
||||
/**
|
||||
* This class extends the BinarySearchTree by adding the rotate
|
||||
* operations. Rotation will change the balance of a search
|
||||
* tree while preserving the search tree property.
|
||||
* Used as a common base class for self-balancing trees.
|
||||
* @param <E> The element type
|
||||
* @author Koffman and Wolfgang
|
||||
*/
|
||||
public class BinarySearchTreeWithRotate<E extends Comparable<E>> extends BinarySearchTree<E> {
|
||||
|
||||
// Methods
|
||||
/**
|
||||
* Method to perform a right rotation.
|
||||
* @pre root is the root of a binary search tree.
|
||||
* @post root.right is the root of a binary search tree,
|
||||
* root.right.right is raised one level,
|
||||
* root.right.left does not change levels,
|
||||
* root.left is lowered one level,
|
||||
* the new root is returned.
|
||||
* @param root The root of the binary tree to be rotated
|
||||
* @return The new root of the rotated tree
|
||||
*/
|
||||
protected Node<E> rotateRight(Node<E> root) {
|
||||
Node<E> temp = root.left;
|
||||
root.left = temp.right;
|
||||
temp.right = root;
|
||||
return temp;
|
||||
}
|
||||
|
||||
/**
|
||||
* Method to perform a left rotation (rotateLeft).
|
||||
* @pre localRoot is the root of a binary search tree
|
||||
* @post localRoot.right is the root of a binary search tree
|
||||
* localRoot.right.right is raised one level
|
||||
* localRoot.right.left does not change levels
|
||||
* localRoot.left is lowered one level
|
||||
* the new localRoot is returned.
|
||||
* @param localRoot The root of the binary tree to be rotated
|
||||
* @return the new root of the rotated tree
|
||||
*/
|
||||
protected Node<E> rotateLeft(Node<E> localRoot) {
|
||||
Node<E> temp = localRoot.right;
|
||||
localRoot.right = temp.left;
|
||||
temp.left = localRoot;
|
||||
return temp;
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user