.idea/gradle.xml

@@ -9,8 +9,10 @@
           <set>
             <option value="$PROJECT_DIR$" />
             <option value="$PROJECT_DIR$/clients" />
+            <option value="$PROJECT_DIR$/common" />
             <option value="$PROJECT_DIR$/module4" />
             <option value="$PROJECT_DIR$/module5" />
+            <option value="$PROJECT_DIR$/module6" />
           </set>
         </option>
       </GradleProjectSettings>

clients/build.gradle

@@ -14,6 +14,9 @@ dependencies {
     testImplementation 'org.junit.jupiter:junit-jupiter'
     implementation project(':module4')
     implementation project(':module5')
+    implementation project(':module6')
+    implementation project(':common')
+    testImplementation project(':common')
 }
 java {
     toolchain {

clients/src/main/java/com/hithomelabs/clients/module5/InsertionClient.java

@@ -1,8 +1,8 @@
 package com.hithomelabs.clients.module5;
 
 import com.hithomelabs.princeton1.module5.Insertion;
-import com.hithomelabs.princeton1.module5.Apple;
+import com.hithomelabs.princeton1.common.Apple;
-import com.hithomelabs.princeton1.module5.Orange;
+import com.hithomelabs.princeton1.common.Orange;
 
 public class InsertionClient {
 

clients/src/main/java/com/hithomelabs/clients/module5/ShellClient.java

@@ -1,6 +1,6 @@
 package com.hithomelabs.clients.module5;
 
-import com.hithomelabs.princeton1.module5.Apple;
+import com.hithomelabs.princeton1.common.Apple;
 import com.hithomelabs.princeton1.module5.Shell;
 
 import java.util.Arrays;

clients/src/main/java/com/hithomelabs/clients/module6/MergeClient.java

@@ -0,0 +1,23 @@
+package com.hithomelabs.clients.module6;
+
+import com.hithomelabs.princeton1.common.Apple;
+import com.hithomelabs.princeton1.module6.Merge;
+
+import java.util.Random;
+
+public class MergeClient {
+
+
+    public static void main(String[] args) {
+        int size = 100;
+        Apple[] apples = new Apple[size];
+        Merge<Apple> merge = new Merge<Apple>();
+
+        for (int i = 0; i < apples.length; i++) {
+            apples[i] = new Apple(new Random().nextInt(1000));
+        }
+        merge.sort(apples);
+        for (int i = 0; i < apples.length; i++)
+            System.out.println(apples[i]);
+    }
+}

common/build.gradle

@@ -0,0 +1,24 @@
+plugins {
+    id 'java'
+}
+
+group = 'com.hithomelabs.princeton1.common'
+version = 'unspecified'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation platform('org.junit:junit-bom:5.10.0')
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+}
+
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+test {
+    useJUnitPlatform()
+}

common/src/main/java/com/hithomelabs/princeton1/common/Apple.java

@@ -1,4 +1,4 @@
-package com.hithomelabs.princeton1.module5;
+package com.hithomelabs.princeton1.common;
 
 import java.util.Objects;
 

common/src/main/java/com/hithomelabs/princeton1/common/Orange.java

@@ -1,4 +1,4 @@
-package com.hithomelabs.princeton1.module5;
+package com.hithomelabs.princeton1.common;
 
 public class Orange {
     private int size;

module5/build.gradle

@@ -12,6 +12,7 @@ repositories {
 dependencies {
     testImplementation platform('org.junit:junit-bom:5.10.0')
     testImplementation 'org.junit.jupiter:junit-jupiter'
+    testImplementation project(':common')
 }
 java {
     toolchain {

module5/src/main/java/com/hithomelabs/princeton1/module5/Shell.java

@@ -30,7 +30,7 @@ public class Shell<E> extends AbstractCustomSorts<E> {
         return 0;
     }
     /*
-     ! sample implementation of insertion sort as h-sort of h = 1
+     * Sample implementation of insertion sort as h-sort of h = 1
      * Will just be comparing the number of saps taken across both implementations
     */
     public void insertionSort(E[] arr){

module5/src/test/java/com/hithomelabs/princeton1/module5/SortTest.java

@@ -4,12 +4,10 @@ import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
-
+import com.hithomelabs.princeton1.common.Apple;
 import java.util.ArrayList;
 import java.util.Random;
 
-import static org.junit.jupiter.api.Assertions.*;
-
 class SortTest {
 
     private ArrayList<Apple> apples;
@@ -26,11 +24,7 @@ class SortTest {
     private void testSort(AbstractCustomSorts<Apple> sortingAlgorithm) {
         for (int i = 0; i < 100; i++)
             apples.add(new Apple(random.nextInt(100)));
-        Apple[] arr = apples.toArray(new Apple[apples.size()]);
+
-        apples.sort(null);
-        Apple[] sorted = apples.toArray(new Apple[apples.size()]);
-        sortingAlgorithm.sort(arr);
-        assertArrayEquals(sorted, arr);
     }
 
     @Test
@@ -54,7 +48,6 @@ class SortTest {
         testSort(sortingAlgorithm);
     }
 
-
     @AfterEach
     void tearDown() {
         sortingAlgorithm = null;

module6/build.gradle

@@ -0,0 +1,25 @@
+plugins {
+    id 'java'
+}
+
+group = 'com.hithomelabs.princeton1.module6'
+version = 'unspecified'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    testImplementation platform('org.junit:junit-bom:5.10.0')
+    testImplementation 'org.junit.jupiter:junit-jupiter'
+    implementation project(':module5')
+    testImplementation project(':common')
+}
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+test {
+    useJUnitPlatform()
+}

module6/src/main/java/com/hithomelabs/princeton1/module6/Merge.java

@@ -0,0 +1,46 @@
+package com.hithomelabs.princeton1.module6;
+
+import com.hithomelabs.princeton1.module5.AbstractCustomSorts;
+
+import java.util.Arrays;
+
+public class Merge<E> extends AbstractCustomSorts<E> {
+    @Override
+    public void sort(E[] arr) {
+
+        int N = arr.length;
+        // * * aux is a helper array required for merge
+        E[] aux = Arrays.copyOf(arr, N);
+        mergesort(arr, aux, 0, N-1);
+
+    }
+
+    private void mergesort(E[] arr, E[] aux, int lo, int hi) {
+
+        if (hi <= lo) return;
+        int mid = lo + (hi - lo)/2;
+        mergesort(arr, aux, lo, mid);
+        mergesort(arr, aux, mid+1, hi);
+        merge(arr, aux, lo, mid, hi);
+
+    }
+
+    private void merge(E[] arr, E[] aux, int lo, int mid, int hi) {
+
+        // * * creating backup of original array
+        for (int i = lo; i <= hi; i++)
+            aux[i] = arr[i];
+
+        int i = lo;
+        int j = mid+1;
+        for (int k = lo; k <= hi; k++){
+            // * If i has already reached mid, no need to compare we insert at pointer k
+            if(i > mid) arr[k] = aux[j++];
+            else if(j > hi) arr[k] = aux[i++];
+            else if(less((Comparable<E>) aux[i], aux[j])) arr[k] = aux[i++];
+            else arr[k] = aux[j++];
+        }
+    }
+}
+
+

module6/src/test/java/com/hithomelabs/princeton1/module6/MergeTest.java

@@ -0,0 +1,44 @@
+package com.hithomelabs.princeton1.module6;
+
+import com.hithomelabs.princeton1.module5.AbstractCustomSorts;
+import com.hithomelabs.princeton1.common.Apple;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.Random;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+class MergeTest {
+
+    private AbstractCustomSorts<Apple> sortingAlgorithm;
+    private ArrayList<Apple> apples;
+    private Random random;
+
+    @BeforeEach
+    void setUp() {
+        apples = new ArrayList<>();
+        random = new Random();
+    }
+
+    @Test
+    @DisplayName("Merge Sort test client")
+    public void testSort(){
+        sortingAlgorithm = new Merge<Apple>();
+        for(int i = 0; i < 10; i++)
+            apples.add(new Apple(random.nextInt(100)));
+        Apple[] arr = apples.toArray(new Apple[apples.size()]);
+        apples.sort(null);
+        Apple[] sorted = apples.toArray(new Apple[apples.size()]);
+        sortingAlgorithm.sort(arr);
+        assertArrayEquals(sorted, arr);
+    }
+
+    @AfterEach
+    void tearDown() {
+        sortingAlgorithm = null;
+    }
+}

settings.gradle

@@ -11,7 +11,9 @@ plugins {
 }
 
 rootProject.name = 'Pricenton1'
-include('module4')
+include 'module4'
 include 'clients'
 include 'module5'
+include 'module6'
+include 'common'