Add merge sort algorithm
This commit is contained in:
parent
e761b0c857
commit
db62e6140b
23 changed files with 624 additions and 0 deletions
28
.idea/codeStyles/Project.xml
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28
.idea/codeStyles/Project.xml
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@ -0,0 +1,28 @@
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<component name="ProjectCodeStyleConfiguration">
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<code_scheme name="Project" version="173">
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<DBN-PSQL>
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<case-options enabled="false">
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<option name="KEYWORD_CASE" value="lower" />
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<option name="FUNCTION_CASE" value="lower" />
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<option name="PARAMETER_CASE" value="lower" />
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<option name="DATATYPE_CASE" value="lower" />
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<option name="OBJECT_CASE" value="preserve" />
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</case-options>
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<formatting-settings enabled="false" />
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</DBN-PSQL>
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<DBN-SQL>
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<case-options enabled="false">
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<option name="KEYWORD_CASE" value="lower" />
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<option name="FUNCTION_CASE" value="lower" />
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<option name="PARAMETER_CASE" value="lower" />
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<option name="DATATYPE_CASE" value="lower" />
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<option name="OBJECT_CASE" value="preserve" />
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</case-options>
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<formatting-settings enabled="false">
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<option name="STATEMENT_SPACING" value="one_line" />
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<option name="CLAUSE_CHOP_DOWN" value="chop_down_if_statement_long" />
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<option name="ITERATION_ELEMENTS_WRAPPING" value="chop_down_if_not_single" />
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</formatting-settings>
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</DBN-SQL>
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</code_scheme>
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</component>
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5
.idea/codeStyles/codeStyleConfig.xml
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5
.idea/codeStyles/codeStyleConfig.xml
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@ -0,0 +1,5 @@
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<component name="ProjectCodeStyleConfiguration">
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<state>
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<option name="PREFERRED_PROJECT_CODE_STYLE" value="Default" />
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</state>
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</component>
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11
.idea/compiler.xml
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11
.idea/compiler.xml
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@ -0,0 +1,11 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="CompilerConfiguration">
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<bytecodeTargetLevel>
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<module name="algorithms_main" target="1.8" />
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<module name="algorithms_test" target="1.8" />
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<module name="sorting_main" target="1.8" />
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<module name="sorting_test" target="1.8" />
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</bytecodeTargetLevel>
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</component>
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</project>
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17
.idea/gradle.xml
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17
.idea/gradle.xml
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@ -0,0 +1,17 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="GradleSettings">
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<option name="linkedExternalProjectsSettings">
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<GradleProjectSettings>
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<option name="distributionType" value="DEFAULT_WRAPPED" />
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<option name="externalProjectPath" value="$PROJECT_DIR$" />
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<option name="modules">
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<set>
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<option value="$PROJECT_DIR$" />
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<option value="$PROJECT_DIR$/sorting" />
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</set>
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</option>
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</GradleProjectSettings>
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</option>
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</component>
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</project>
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6
.idea/misc.xml
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6
.idea/misc.xml
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@ -0,0 +1,6 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="false" project-jdk-name="1.8" project-jdk-type="JavaSDK">
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<output url="file://$PROJECT_DIR$/out" />
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</component>
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</project>
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13
.idea/modules.xml
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13
.idea/modules.xml
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@ -0,0 +1,13 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<project version="4">
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<component name="ProjectModuleManager">
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<modules>
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<module fileurl="file://$PROJECT_DIR$/.idea/modules/algorithms.iml" filepath="$PROJECT_DIR$/.idea/modules/algorithms.iml" />
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<module fileurl="file://$PROJECT_DIR$/.idea/modules/algorithms_main.iml" filepath="$PROJECT_DIR$/.idea/modules/algorithms_main.iml" group="algorithms" />
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<module fileurl="file://$PROJECT_DIR$/.idea/modules/algorithms_test.iml" filepath="$PROJECT_DIR$/.idea/modules/algorithms_test.iml" group="algorithms" />
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<module fileurl="file://$PROJECT_DIR$/.idea/modules/sorting.iml" filepath="$PROJECT_DIR$/.idea/modules/sorting.iml" group="sorting" />
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<module fileurl="file://$PROJECT_DIR$/.idea/modules/sorting/sorting_main.iml" filepath="$PROJECT_DIR$/.idea/modules/sorting/sorting_main.iml" group="sorting" />
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<module fileurl="file://$PROJECT_DIR$/.idea/modules/sorting/sorting_test.iml" filepath="$PROJECT_DIR$/.idea/modules/sorting/sorting_test.iml" group="sorting" />
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</modules>
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</component>
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</project>
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13
.idea/modules/algorithms.iml
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13
.idea/modules/algorithms.iml
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@ -0,0 +1,13 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module external.linked.project.id="algorithms" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$/../..">
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<excludeFolder url="file://$MODULE_DIR$/../../.gradle" />
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<excludeFolder url="file://$MODULE_DIR$/../../build" />
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<excludeFolder url="file://$MODULE_DIR$/../../out" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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13
.idea/modules/algorithms_main.iml
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13
.idea/modules/algorithms_main.iml
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<?xml version="1.0" encoding="UTF-8"?>
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<module external.linked.project.id="algorithms:main" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager">
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<output url="file://$MODULE_DIR$/../../out/production/classes" />
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<exclude-output />
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<content url="file://$MODULE_DIR$/../../src/main">
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<sourceFolder url="file://$MODULE_DIR$/../../src/main/java" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/../../src/main/resources" type="java-resource" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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17
.idea/modules/algorithms_test.iml
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17
.idea/modules/algorithms_test.iml
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@ -0,0 +1,17 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module external.linked.project.id="algorithms:test" external.linked.project.path="$MODULE_DIR$/../.." external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager">
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<output-test url="file://$MODULE_DIR$/../../out/test/classes" />
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<exclude-output />
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<content url="file://$MODULE_DIR$/../../src/test">
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<sourceFolder url="file://$MODULE_DIR$/../../src/test/java" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/../../src/test/resources" type="java-test-resource" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="module" module-name="algorithms_main" />
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<orderEntry type="library" name="Gradle: junit:junit:4.12" level="project" />
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<orderEntry type="library" name="Gradle: org.hamcrest:hamcrest-core:1.3" level="project" />
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</component>
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<component name="TestModuleProperties" production-module="algorithms_main" />
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</module>
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13
.idea/modules/sorting.iml
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13
.idea/modules/sorting.iml
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@ -0,0 +1,13 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<module external.linked.project.id=":sorting" external.linked.project.path="$MODULE_DIR$/../../sorting" external.root.project.path="$MODULE_DIR$/../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager" inherit-compiler-output="true">
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<exclude-output />
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<content url="file://$MODULE_DIR$/../../sorting">
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<excludeFolder url="file://$MODULE_DIR$/../../sorting/.gradle" />
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<excludeFolder url="file://$MODULE_DIR$/../../sorting/build" />
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<excludeFolder url="file://$MODULE_DIR$/../../sorting/out" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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13
.idea/modules/sorting/sorting_main.iml
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13
.idea/modules/sorting/sorting_main.iml
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<?xml version="1.0" encoding="UTF-8"?>
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<module external.linked.project.id=":sorting:main" external.linked.project.path="$MODULE_DIR$/../../../sorting" external.root.project.path="$MODULE_DIR$/../../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager">
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<output url="file://$MODULE_DIR$/../../../sorting/out/production/classes" />
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<exclude-output />
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<content url="file://$MODULE_DIR$/../../../sorting/src/main">
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<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/main/java" isTestSource="false" />
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<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/main/resources" type="java-resource" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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</component>
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</module>
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17
.idea/modules/sorting/sorting_test.iml
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17
.idea/modules/sorting/sorting_test.iml
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<?xml version="1.0" encoding="UTF-8"?>
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<module external.linked.project.id=":sorting:test" external.linked.project.path="$MODULE_DIR$/../../../sorting" external.root.project.path="$MODULE_DIR$/../../.." external.system.id="GRADLE" external.system.module.group="com.wbrawner" external.system.module.type="sourceSet" external.system.module.version="1.0-SNAPSHOT" type="JAVA_MODULE" version="4">
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<component name="NewModuleRootManager">
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<output-test url="file://$MODULE_DIR$/../../../sorting/out/test/classes" />
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<exclude-output />
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<content url="file://$MODULE_DIR$/../../../sorting/src/test">
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<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/test/java" isTestSource="true" />
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<sourceFolder url="file://$MODULE_DIR$/../../../sorting/src/test/resources" type="java-test-resource" />
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</content>
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<orderEntry type="inheritedJdk" />
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<orderEntry type="sourceFolder" forTests="false" />
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<orderEntry type="module" module-name="sorting_main" />
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<orderEntry type="library" name="Gradle: junit:junit:4.12" level="project" />
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<orderEntry type="library" name="Gradle: org.hamcrest:hamcrest-core:1.3" level="project" />
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</component>
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<component name="TestModuleProperties" production-module="sorting_main" />
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</module>
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13
README.md
13
README.md
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@ -4,3 +4,16 @@ This repository is meant for me to compile a list of examples of different
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algorithms that I have learned of, and develop a working implementation.
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These implementations may not be the most efficient, so please do point it
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out to me if you see something that could be improved upon.
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## Sorting
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- [Merge Sort](sorting/src/main/java/com/wbrawner/algorithms/sorting/MergeSort.java)
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- [Tests](sorting/src/test/java/com/wbrawner/algorithms/sorting/ParameterizedMergeSortTest.java)
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## Building/Testing
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./gradlew test
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To keep things simple, the tests share the same data where possible.
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- [Sorting test data](sorting/src/test/java/com/wbrawner/algorithms/sorting/SortData.java)
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14
build.gradle
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14
build.gradle
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group 'com.wbrawner'
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version '1.0-SNAPSHOT'
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apply plugin: 'java'
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sourceCompatibility = 1.8
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repositories {
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mavenCentral()
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}
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dependencies {
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testCompile group: 'junit', name: 'junit', version: '4.12'
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}
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BIN
gradle/wrapper/gradle-wrapper.jar
vendored
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BIN
gradle/wrapper/gradle-wrapper.jar
vendored
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Binary file not shown.
6
gradle/wrapper/gradle-wrapper.properties
vendored
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6
gradle/wrapper/gradle-wrapper.properties
vendored
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#Thu Oct 04 23:45:47 CDT 2018
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distributionBase=GRADLE_USER_HOME
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distributionPath=wrapper/dists
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zipStoreBase=GRADLE_USER_HOME
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zipStorePath=wrapper/dists
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distributionUrl=https\://services.gradle.org/distributions/gradle-4.0-all.zip
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172
gradlew
vendored
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172
gradlew
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#!/usr/bin/env sh
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##############################################################################
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##
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## Gradle start up script for UN*X
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##
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##############################################################################
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# Attempt to set APP_HOME
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# Resolve links: $0 may be a link
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PRG="$0"
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# Need this for relative symlinks.
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while [ -h "$PRG" ] ; do
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ls=`ls -ld "$PRG"`
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link=`expr "$ls" : '.*-> \(.*\)$'`
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if expr "$link" : '/.*' > /dev/null; then
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PRG="$link"
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else
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PRG=`dirname "$PRG"`"/$link"
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fi
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done
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SAVED="`pwd`"
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cd "`dirname \"$PRG\"`/" >/dev/null
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APP_HOME="`pwd -P`"
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cd "$SAVED" >/dev/null
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APP_NAME="Gradle"
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APP_BASE_NAME=`basename "$0"`
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# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
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DEFAULT_JVM_OPTS=""
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# Use the maximum available, or set MAX_FD != -1 to use that value.
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MAX_FD="maximum"
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warn () {
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echo "$*"
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}
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die () {
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echo
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echo "$*"
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echo
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exit 1
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}
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# OS specific support (must be 'true' or 'false').
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cygwin=false
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msys=false
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darwin=false
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nonstop=false
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case "`uname`" in
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CYGWIN* )
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cygwin=true
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;;
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Darwin* )
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darwin=true
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;;
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MINGW* )
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msys=true
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;;
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NONSTOP* )
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nonstop=true
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;;
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esac
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CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
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# Determine the Java command to use to start the JVM.
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if [ -n "$JAVA_HOME" ] ; then
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if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
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# IBM's JDK on AIX uses strange locations for the executables
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JAVACMD="$JAVA_HOME/jre/sh/java"
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else
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JAVACMD="$JAVA_HOME/bin/java"
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fi
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if [ ! -x "$JAVACMD" ] ; then
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die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
|
||||
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||||
Please set the JAVA_HOME variable in your environment to match the
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location of your Java installation."
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||||
fi
|
||||
else
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JAVACMD="java"
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||||
which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
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||||
|
||||
Please set the JAVA_HOME variable in your environment to match the
|
||||
location of your Java installation."
|
||||
fi
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||||
|
||||
# Increase the maximum file descriptors if we can.
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||||
if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
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MAX_FD_LIMIT=`ulimit -H -n`
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if [ $? -eq 0 ] ; then
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||||
if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
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MAX_FD="$MAX_FD_LIMIT"
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fi
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ulimit -n $MAX_FD
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if [ $? -ne 0 ] ; then
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warn "Could not set maximum file descriptor limit: $MAX_FD"
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fi
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else
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warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
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fi
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||||
fi
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# For Darwin, add options to specify how the application appears in the dock
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if $darwin; then
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||||
GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
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||||
fi
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||||
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# For Cygwin, switch paths to Windows format before running java
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if $cygwin ; then
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APP_HOME=`cygpath --path --mixed "$APP_HOME"`
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||||
CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
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JAVACMD=`cygpath --unix "$JAVACMD"`
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# We build the pattern for arguments to be converted via cygpath
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ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
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SEP=""
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for dir in $ROOTDIRSRAW ; do
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ROOTDIRS="$ROOTDIRS$SEP$dir"
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||||
SEP="|"
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||||
done
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||||
OURCYGPATTERN="(^($ROOTDIRS))"
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||||
# Add a user-defined pattern to the cygpath arguments
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||||
if [ "$GRADLE_CYGPATTERN" != "" ] ; then
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||||
OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
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||||
fi
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||||
# Now convert the arguments - kludge to limit ourselves to /bin/sh
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||||
i=0
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for arg in "$@" ; do
|
||||
CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
|
||||
CHECK2=`echo "$arg"|egrep -c "^-"` ### Determine if an option
|
||||
|
||||
if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then ### Added a condition
|
||||
eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
|
||||
else
|
||||
eval `echo args$i`="\"$arg\""
|
||||
fi
|
||||
i=$((i+1))
|
||||
done
|
||||
case $i in
|
||||
(0) set -- ;;
|
||||
(1) set -- "$args0" ;;
|
||||
(2) set -- "$args0" "$args1" ;;
|
||||
(3) set -- "$args0" "$args1" "$args2" ;;
|
||||
(4) set -- "$args0" "$args1" "$args2" "$args3" ;;
|
||||
(5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
|
||||
(6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
|
||||
(7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
|
||||
(8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
|
||||
(9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
|
||||
esac
|
||||
fi
|
||||
|
||||
# Escape application args
|
||||
save () {
|
||||
for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
|
||||
echo " "
|
||||
}
|
||||
APP_ARGS=$(save "$@")
|
||||
|
||||
# Collect all arguments for the java command, following the shell quoting and substitution rules
|
||||
eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
|
||||
|
||||
# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
|
||||
if [ "$(uname)" = "Darwin" ] && [ "$HOME" = "$PWD" ]; then
|
||||
cd "$(dirname "$0")"
|
||||
fi
|
||||
|
||||
exec "$JAVACMD" "$@"
|
||||
84
gradlew.bat
vendored
Normal file
84
gradlew.bat
vendored
Normal file
|
|
@ -0,0 +1,84 @@
|
|||
@if "%DEBUG%" == "" @echo off
|
||||
@rem ##########################################################################
|
||||
@rem
|
||||
@rem Gradle startup script for Windows
|
||||
@rem
|
||||
@rem ##########################################################################
|
||||
|
||||
@rem Set local scope for the variables with windows NT shell
|
||||
if "%OS%"=="Windows_NT" setlocal
|
||||
|
||||
set DIRNAME=%~dp0
|
||||
if "%DIRNAME%" == "" set DIRNAME=.
|
||||
set APP_BASE_NAME=%~n0
|
||||
set APP_HOME=%DIRNAME%
|
||||
|
||||
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
|
||||
set DEFAULT_JVM_OPTS=
|
||||
|
||||
@rem Find java.exe
|
||||
if defined JAVA_HOME goto findJavaFromJavaHome
|
||||
|
||||
set JAVA_EXE=java.exe
|
||||
%JAVA_EXE% -version >NUL 2>&1
|
||||
if "%ERRORLEVEL%" == "0" goto init
|
||||
|
||||
echo.
|
||||
echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
|
||||
echo.
|
||||
echo Please set the JAVA_HOME variable in your environment to match the
|
||||
echo location of your Java installation.
|
||||
|
||||
goto fail
|
||||
|
||||
:findJavaFromJavaHome
|
||||
set JAVA_HOME=%JAVA_HOME:"=%
|
||||
set JAVA_EXE=%JAVA_HOME%/bin/java.exe
|
||||
|
||||
if exist "%JAVA_EXE%" goto init
|
||||
|
||||
echo.
|
||||
echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
|
||||
echo.
|
||||
echo Please set the JAVA_HOME variable in your environment to match the
|
||||
echo location of your Java installation.
|
||||
|
||||
goto fail
|
||||
|
||||
:init
|
||||
@rem Get command-line arguments, handling Windows variants
|
||||
|
||||
if not "%OS%" == "Windows_NT" goto win9xME_args
|
||||
|
||||
:win9xME_args
|
||||
@rem Slurp the command line arguments.
|
||||
set CMD_LINE_ARGS=
|
||||
set _SKIP=2
|
||||
|
||||
:win9xME_args_slurp
|
||||
if "x%~1" == "x" goto execute
|
||||
|
||||
set CMD_LINE_ARGS=%*
|
||||
|
||||
:execute
|
||||
@rem Setup the command line
|
||||
|
||||
set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
|
||||
|
||||
@rem Execute Gradle
|
||||
"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %CMD_LINE_ARGS%
|
||||
|
||||
:end
|
||||
@rem End local scope for the variables with windows NT shell
|
||||
if "%ERRORLEVEL%"=="0" goto mainEnd
|
||||
|
||||
:fail
|
||||
rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
|
||||
rem the _cmd.exe /c_ return code!
|
||||
if not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
|
||||
exit /b 1
|
||||
|
||||
:mainEnd
|
||||
if "%OS%"=="Windows_NT" endlocal
|
||||
|
||||
:omega
|
||||
3
settings.gradle
Normal file
3
settings.gradle
Normal file
|
|
@ -0,0 +1,3 @@
|
|||
rootProject.name = 'algorithms'
|
||||
include 'sorting'
|
||||
|
||||
14
sorting/build.gradle
Normal file
14
sorting/build.gradle
Normal file
|
|
@ -0,0 +1,14 @@
|
|||
group 'com.wbrawner'
|
||||
version '1.0-SNAPSHOT'
|
||||
|
||||
apply plugin: 'java'
|
||||
|
||||
sourceCompatibility = 1.8
|
||||
|
||||
repositories {
|
||||
mavenCentral()
|
||||
}
|
||||
|
||||
dependencies {
|
||||
testCompile group: 'junit', name: 'junit', version: '4.12'
|
||||
}
|
||||
|
|
@ -0,0 +1,65 @@
|
|||
package com.wbrawner.algorithms.sorting;
|
||||
|
||||
import java.util.Arrays;
|
||||
|
||||
/**
|
||||
* The Merge Sort algorithm works by the "divide and conquer" strategy. The
|
||||
* given array of data is recursively split into two smaller arrays that are
|
||||
* sorted individually before being merged back together.
|
||||
*/
|
||||
public class MergeSort {
|
||||
/**
|
||||
* Sort a given array of ints using the Merge Sort algorithm
|
||||
*
|
||||
* @param unsorted an unsorted array of ints
|
||||
* @return a sorted array of ints
|
||||
*/
|
||||
public static int[] sort(int[] unsorted) {
|
||||
// An empty array or array with only a single value can't be sorted
|
||||
if (unsorted.length < 2) {
|
||||
return unsorted;
|
||||
}
|
||||
|
||||
// Since the array has at least 2 elements, we should evenly (or as
|
||||
// close as possible to evenly) split it, sort the values, and merge
|
||||
// them back together
|
||||
int midPoint = unsorted.length / 2;
|
||||
int[] first = Arrays.copyOfRange(unsorted, 0, midPoint);
|
||||
int[] second = Arrays.copyOfRange(unsorted, midPoint, unsorted.length);
|
||||
return merge(
|
||||
sort(first),
|
||||
sort(second)
|
||||
);
|
||||
}
|
||||
|
||||
private static int[] merge(int[] first, int[] second) {
|
||||
// Create a new array that can hold both of the given arrays
|
||||
int[] sorted = new int[first.length + second.length];
|
||||
// Three values are used here:
|
||||
// i - keeps track of the sorted array's index
|
||||
// j - keeps track of the first array's index
|
||||
// k - keeps track of the second array's index
|
||||
int i, j = 0, k = 0;
|
||||
for (i = 0; i < sorted.length; i++) {
|
||||
// If we still have values from the first array...
|
||||
if (j < first.length
|
||||
// ... and we either don't have values from the second
|
||||
// array or the value at the current index of the first
|
||||
// array is less than the value at the current index of
|
||||
// the second array...
|
||||
&& (k >= second.length || first[j] < second[k])
|
||||
) {
|
||||
// ... then we append the value at the current index of the
|
||||
// first array to the sorted array.
|
||||
sorted[i] = first[j];
|
||||
j++;
|
||||
} else if (k < second.length) {
|
||||
// In any other case, we should add the value at the current
|
||||
// index of the second array
|
||||
sorted[i] = second[k];
|
||||
k++;
|
||||
}
|
||||
}
|
||||
return sorted;
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,31 @@
|
|||
package com.wbrawner.algorithms.sorting;
|
||||
|
||||
import org.junit.Test;
|
||||
import org.junit.runner.RunWith;
|
||||
import org.junit.runners.Parameterized;
|
||||
|
||||
import static org.junit.Assert.assertArrayEquals;
|
||||
|
||||
@RunWith(Parameterized.class)
|
||||
public class ParameterizedMergeSortTest {
|
||||
|
||||
|
||||
@Parameterized.Parameter(1)
|
||||
public int[] sorted;
|
||||
|
||||
@Parameterized.Parameter()
|
||||
public int[] unsorted;
|
||||
|
||||
@Test
|
||||
public void sortTest() {
|
||||
assertArrayEquals(
|
||||
sorted,
|
||||
MergeSort.sort(unsorted)
|
||||
);
|
||||
}
|
||||
|
||||
@Parameterized.Parameters
|
||||
public static int[][][] getData() {
|
||||
return SortData.get();
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,56 @@
|
|||
package com.wbrawner.algorithms.sorting;
|
||||
|
||||
public class SortData {
|
||||
/**
|
||||
* Test helper method to get test data for sorting tests
|
||||
*
|
||||
* @return a multidimensional array of unsorted and sorted arrays wrapped
|
||||
* in an array
|
||||
*/
|
||||
public static int[][][] get() {
|
||||
return new int[][][]{
|
||||
// First data set - even number of integers with no repeats
|
||||
new int[][]{
|
||||
// Unsorted values
|
||||
new int[]{5, 4, 1, 8, 7, 2, 6, 3},
|
||||
// Sorted values
|
||||
new int[]{1, 2, 3, 4, 5, 6, 7, 8}
|
||||
},
|
||||
// Second data set - odd number of integers with no repeats
|
||||
new int[][]{
|
||||
// Unsorted values
|
||||
new int[]{9, 5, 4, 1, 8, 7, 2, 6, 3},
|
||||
// Sorted values
|
||||
new int[]{1, 2, 3, 4, 5, 6, 7, 8, 9}
|
||||
},
|
||||
// Third data set - even number of integers with repeats
|
||||
new int[][]{
|
||||
// Unsorted values
|
||||
new int[]{9, 5, 4, 4, 8, 7, 2, 6, 3},
|
||||
// Sorted values
|
||||
new int[]{2, 3, 4, 4, 5, 6, 7, 8, 9}
|
||||
},
|
||||
// Fourth data set - odd number of integers with repeats
|
||||
new int[][]{
|
||||
// Unsorted values
|
||||
new int[]{9, 5, 4, 4, 8, 7, 2, 6, 3, 5},
|
||||
// Sorted values
|
||||
new int[]{2, 3, 4, 4, 5, 5, 6, 7, 8, 9}
|
||||
},
|
||||
// Fifth data set - empty array
|
||||
new int[][]{
|
||||
// Unsorted values
|
||||
new int[]{},
|
||||
// Sorted values
|
||||
new int[]{}
|
||||
},
|
||||
// Sixth data set - a single integer array
|
||||
new int[][]{
|
||||
// Unsorted values
|
||||
new int[]{1},
|
||||
// Sorted values
|
||||
new int[]{1}
|
||||
},
|
||||
};
|
||||
}
|
||||
}
|
||||
Loading…
Reference in a new issue