first commit

.idea/.gitignore

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+# Default ignored files
+/workspace.xml

.idea/_Programme.iml

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+<?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://$MODULE_DIR$" />
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>

.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="JavaScriptSettings">
+    <option name="languageLevel" value="ES6" />
+  </component>
+</project>

.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/_Programme.iml" filepath="$PROJECT_DIR$/.idea/_Programme.iml" />
+    </modules>
+  </component>
+</project>

.idea/vcs.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$" vcs="Git" />
+  </component>
+</project>

Mergesort/.idea/.name

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+Mergesort

Mergesort/.idea/misc.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_11" default="true" project-jdk-name="11" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
+</project>

Mergesort/.idea/modules.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/Mergesort.iml" filepath="$PROJECT_DIR$/Mergesort.iml" />
+    </modules>
+  </component>
+</project>

Mergesort/.idea/workspace.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ChangeListManager">
+    <list default="true" id="c8adc784-126f-470a-a7fd-698c37d72caf" name="Default Changelist" comment="" />
+    <option name="EXCLUDED_CONVERTED_TO_IGNORED" value="true" />
+    <option name="SHOW_DIALOG" value="false" />
+    <option name="HIGHLIGHT_CONFLICTS" value="true" />
+    <option name="HIGHLIGHT_NON_ACTIVE_CHANGELIST" value="false" />
+    <option name="LAST_RESOLUTION" value="IGNORE" />
+  </component>
+  <component name="FileTemplateManagerImpl">
+    <option name="RECENT_TEMPLATES">
+      <list>
+        <option value="Class" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectId" id="1QzzoweBm11mFzbea31cckI8MbE" />
+  <component name="PropertiesComponent">
+    <property name="WebServerToolWindowFactoryState" value="false" />
+    <property name="aspect.path.notification.shown" value="true" />
+  </component>
+  <component name="RunDashboard">
+    <option name="ruleStates">
+      <list>
+        <RuleState>
+          <option name="name" value="ConfigurationTypeDashboardGroupingRule" />
+        </RuleState>
+        <RuleState>
+          <option name="name" value="StatusDashboardGroupingRule" />
+        </RuleState>
+      </list>
+    </option>
+  </component>
+  <component name="RunManager">
+    <configuration name="Mergesort" type="Application" factoryName="Application" temporary="true" nameIsGenerated="true">
+      <option name="MAIN_CLASS_NAME" value="Mergesort" />
+      <module name="Mergesort" />
+      <method v="2">
+        <option name="Make" enabled="true" />
+      </method>
+    </configuration>
+    <recent_temporary>
+      <list>
+        <item itemvalue="Application.Mergesort" />
+      </list>
+    </recent_temporary>
+  </component>
+  <component name="SvnConfiguration">
+    <configuration />
+  </component>
+  <component name="TaskManager">
+    <task active="true" id="Default" summary="Default task">
+      <changelist id="c8adc784-126f-470a-a7fd-698c37d72caf" name="Default Changelist" comment="" />
+      <created>1568788391205</created>
+      <option name="number" value="Default" />
+      <option name="presentableId" value="Default" />
+      <updated>1568788391205</updated>
+      <workItem from="1568788394064" duration="53000" />
+    </task>
+    <servers />
+  </component>
+  <component name="TypeScriptGeneratedFilesManager">
+    <option name="version" value="1" />
+  </component>
+</project>

Mergesort/Mergesort.iml

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+<?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>

Mergesort/src/Mergesort.java

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+public class Mergesort {
+
+    public static int[] intArr = { 16, 23, 14, 7, 21, 20, 6, 1, 17, 13, 12, 9,
+            3, 19 };
+
+    public int[] sort(int l, int r) {
+
+        if (l < r) {
+            int q = (l + r) / 2;
+
+            sort(l, q);
+            sort(q + 1, r);
+            merge(l, q, r);
+        }
+        return intArr;
+    }
+
+    private void merge(int l, int q, int r) {
+        int[] arr = new int[intArr.length];
+        int i, j;
+        for (i = l; i <= q; i++) {
+            arr[i] = intArr[i];
+        }
+        for (j = q + 1; j <= r; j++) {
+            arr[r + q + 1 - j] = intArr[j];
+        }
+        i = l;
+        j = r;
+        for (int k = l; k <= r; k++) {
+            if (arr[i] <= arr[j]) {
+                intArr[k] = arr[i];
+                i++;
+            } else {
+                intArr[k] = arr[j];
+                j--;
+            }
+        }
+    }
+
+    public static void main(String[] args) {
+        Mergesort ms = new Mergesort();
+        int[] arr = ms.sort(0, intArr.length - 1);
+        for (int i = 0; i < arr.length; i++) {
+            System.out.println(i + 1 + ": " + arr[i]);
+        }
+    }
+}