first commit
This commit is contained in:
16
Notes/.idea/checkstyle-idea.xml
generated
Normal file
16
Notes/.idea/checkstyle-idea.xml
generated
Normal file
@@ -0,0 +1,16 @@
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6
Notes/.idea/misc.xml
generated
Normal file
6
Notes/.idea/misc.xml
generated
Normal file
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8
Notes/.idea/modules.xml
generated
Normal file
8
Notes/.idea/modules.xml
generated
Normal file
@@ -0,0 +1,8 @@
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<?xml version="1.0" encoding="UTF-8"?>
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956
Notes/.idea/workspace.xml
generated
Normal file
956
Notes/.idea/workspace.xml
generated
Normal file
@@ -0,0 +1,956 @@
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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||||
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|
||||
<caret line="48" column="25" lean-forward="false" selection-start-line="48" selection-start-column="25" selection-end-line="48" 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/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>
|
||||
11
Notes/Notes.iml
Normal file
11
Notes/Notes.iml
Normal file
@@ -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>
|
||||
BIN
Notes/out/production/Notes/Week1/Exam1Review.class
Normal file
BIN
Notes/out/production/Notes/Week1/Exam1Review.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week1/KWArrayList.class
Normal file
BIN
Notes/out/production/Notes/Week1/KWArrayList.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedList$1.class
Normal file
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedList$1.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedList$Node.class
Normal file
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedList$Node.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedList.class
Normal file
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedList.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedListDriver.class
Normal file
BIN
Notes/out/production/Notes/Week1/KWSingleLinkedListDriver.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week5/AdapterStack.class
Normal file
BIN
Notes/out/production/Notes/Week5/AdapterStack.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week5/KMStack.class
Normal file
BIN
Notes/out/production/Notes/Week5/KMStack.class
Normal file
Binary file not shown.
BIN
Notes/out/production/Notes/Week5/StackDriver.class
Normal file
BIN
Notes/out/production/Notes/Week5/StackDriver.class
Normal file
Binary file not shown.
18
Notes/src/Week1/Exam1Review.java
Normal file
18
Notes/src/Week1/Exam1Review.java
Normal file
@@ -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;
|
||||
}
|
||||
}
|
||||
84
Notes/src/Week1/KWArrayList.java
Normal file
84
Notes/src/Week1/KWArrayList.java
Normal file
@@ -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);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
236
Notes/src/Week1/KWSingleLinkedList.java
Normal file
236
Notes/src/Week1/KWSingleLinkedList.java
Normal file
@@ -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;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
31
Notes/src/Week1/KWSingleLinkedListDriver.java
Normal file
31
Notes/src/Week1/KWSingleLinkedListDriver.java
Normal file
@@ -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);
|
||||
}
|
||||
}
|
||||
10
Notes/src/Week5/AdapterStack.java
Normal file
10
Notes/src/Week5/AdapterStack.java
Normal file
@@ -0,0 +1,10 @@
|
||||
package Week5;
|
||||
|
||||
import java.util.Stack;
|
||||
|
||||
public class AdapterStack<E> {
|
||||
// Original
|
||||
private Stack<E> stack = new Stack<>();
|
||||
// Adapter Methods
|
||||
//public
|
||||
}
|
||||
32
Notes/src/Week5/KMStack.java
Normal file
32
Notes/src/Week5/KMStack.java
Normal file
@@ -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);
|
||||
}
|
||||
}
|
||||
31
Notes/src/Week5/Recursion.java
Normal file
31
Notes/src/Week5/Recursion.java
Normal file
@@ -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);
|
||||
}
|
||||
}
|
||||
20
Notes/src/Week5/StackDriver.java
Normal file
20
Notes/src/Week5/StackDriver.java
Normal file
@@ -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());
|
||||
}
|
||||
|
||||
|
||||
}
|
||||
36
Notes/src/Week6/BinaryTree/BSTDriver.java
Normal file
36
Notes/src/Week6/BinaryTree/BSTDriver.java
Normal file
@@ -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());
|
||||
}
|
||||
}
|
||||
284
Notes/src/Week6/BinaryTree/BinarySearchTree.java
Normal file
284
Notes/src/Week6/BinaryTree/BinarySearchTree.java
Normal file
@@ -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<65>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;
|
||||
}
|
||||
|
||||
}
|
||||
273
Notes/src/Week6/BinaryTree/BinaryTree.java
Normal file
273
Notes/src/Week6/BinaryTree/BinaryTree.java
Normal file
@@ -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>*/
|
||||
72
Notes/src/Week6/BinaryTree/SearchTree.java
Normal file
72
Notes/src/Week6/BinaryTree/SearchTree.java
Normal file
@@ -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();
|
||||
}
|
||||
491
Notes/src/Week9/AVLTree/AVLTree.java
Normal file
491
Notes/src/Week9/AVLTree/AVLTree.java
Normal file
@@ -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);
|
||||
}
|
||||
}
|
||||
51
Notes/src/Week9/AVLTree/BinarySearchTreeWithRotate.java
Normal file
51
Notes/src/Week9/AVLTree/BinarySearchTreeWithRotate.java
Normal file
@@ -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