Anup Kumar Panwar
GitHub
commit
affcbac394
@ -1,109 +1,100 @@
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import java.util.Scanner;
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/**
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* This class implements MergeSort
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* @author Unknown
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*
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* @author Varun Upadhyay (https://github.com/varunu28)
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*
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*/
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public class MergeSort {
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/** Array for mergeSort*/
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private int[] array;
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/** Temp Merge Array*/
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private int[] tempMergArr;
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/** Length of the array*/
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private int length;
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class MergeSort {
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/**
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* Sorts inputArr with merge sort algorithm
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* This method implements the Generic Merge Sort
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*
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* @param inputArr Array to be sorted
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*/
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public final void sort(int inputArr[]) {
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this.array = inputArr;
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this.length = inputArr.length;
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this.tempMergArr = new int[this.length];
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this.mergeSort(0, this.length - 1);
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* @param arr The array to be sorted
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* @param temp The copy of the actual array
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* @param left The first index of the array
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* @param right The last index of the array
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* Recursively sorts the array in increasing order
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**/
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public static <T extends Comparable<T>> void MS(T[] arr, T[] temp, int left, int right) {
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if (left < right) {
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int mid = left + (right - left) / 2;
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MS(arr, temp, left, mid);
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MS(arr, temp,mid + 1, right);
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merge(arr, temp, left, mid, right);
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}
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}
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/**
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* Partitions Array into recursively smaller pieces
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* This method implements the merge step of the merge sort
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*
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* @param lowerIndex lower bound to include in the first partition
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* @param higherIndex upper bound to include in the third partition
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*/
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private void mergeSort(int lowerIndex, int higherIndex) {
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if (lowerIndex < higherIndex) {
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int middle = lowerIndex + (higherIndex - lowerIndex) / 2;
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// Below step sorts the left side of the array
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this.mergeSort(lowerIndex, middle);
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// Below step sorts the right side of the array
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this.mergeSort(middle + 1, higherIndex);
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// Now merge both sides
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this.mergeParts(lowerIndex, middle, higherIndex);
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}
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* @param arr The array to be sorted
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* @param temp The copy of the actual array
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* @param left The first index of the array
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* @param mid The middle index of the array
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* @param right The last index of the array
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* merges two parts of an array in increasing order
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**/
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public static <T extends Comparable<T>> void merge(T[] arr, T[] temp, int left, int mid, int right) {
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for (int i=left;i<=right;i++) {
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temp[i] = arr[i];
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}
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/**
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* Merges partitions
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*
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* @param lowerIndex The lower index
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* @param middle The middle index
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* @param higherIndex The higher index
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*/
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private void mergeParts(int lowerIndex, int middle, int higherIndex) {
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for (int i = lowerIndex; i <= higherIndex; i++) {
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this.tempMergArr[i] = this.array[i];
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}
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int i = lowerIndex;
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int j = middle + 1;
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int k = lowerIndex;
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while (i <= middle && j <= higherIndex) {
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if (this.tempMergArr[i] <= this.tempMergArr[j]) {
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this.array[k] = this.tempMergArr[i];
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int i= left;
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int j = mid + 1;
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int k = left;
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while (i<=mid && j<=right) {
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if (temp[i].compareTo(temp[j]) <= 0) {
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arr[k] = temp[i];
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i++;
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} else {
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this.array[k] = this.tempMergArr[j];
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}
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else {
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arr[k] = temp[j];
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j++;
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}
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k++;
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}
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while (i <= middle) {
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this.array[k] = this.tempMergArr[i];
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k++;
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while (i <= mid) {
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arr[k] = temp[i];
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i++;
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k++;
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}
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}
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// Driver program
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public static void main(String[] args) {
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// Integer Input
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int[] arr = {4,23,6,78,1,54,231,9,12};
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Integer[] array = new Integer[arr.length];
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for (int i=0;i<array.length;i++) {
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array[i] = arr[i];
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}
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/**
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* Gets input to sort
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*
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* @return unsorted array of integers to sort
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*/
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public static int[] getInput() {
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final int numElements = 6;
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int[] unsorted = new int[numElements];
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Scanner input = new Scanner(System.in);
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System.out.println("Enter any 6 Numbers for Unsorted Array : ");
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for (int i = 0; i < numElements; i++) {
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unsorted[i] = input.nextInt();
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}
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input.close();
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return unsorted;
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}
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// Copy of actual array
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Integer[] temp = new Integer[arr.length];
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/**
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* Main Method
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*
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* @param args Command line arguments
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*/
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public static void main(String args[]) {
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int[] inputArr = getInput();
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MergeSort mergeSort = new MergeSort();
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mergeSort.sort(inputArr);
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for (int i : inputArr) {
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System.out.print(i);
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System.out.print(" ");
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MS(array, temp, 0, arr.length-1);
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// Output => 1 4 6 9 12 23 54 78 231
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for (int i=0;i<arr.length;i++) {
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System.out.print(array[i] + " ");
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}
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System.out.println();
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// String Input
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String[] array1 = {"c", "a", "e", "b","d"};
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String[] temp1 = new String[array1.length];
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MS(array1, temp1, 0, array1.length-1);
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//Output => a b c d e
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for(int i=0; i<array1.length; i++)
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{
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System.out.print(array1[i]+"\t");
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}
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}
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}
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93
Sorts/QuickSort.java
Normal file
93
Sorts/QuickSort.java
Normal file
@ -0,0 +1,93 @@
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/**
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*
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* @author Varun Upadhyay (https://github.com/varunu28)
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*
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*/
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class QuickSort {
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/**
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* This method implements the Generic Quick Sort
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*
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* @param array The array to be sorted
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* @param start The first index of an array
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* @param end The last index of an array
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* Sorts the array in increasing order
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**/
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public static <T extends Comparable<T>> void QS(T array[], int start, int end) {
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if (start < end) {
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int PIndex = partition(array, start, end);
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QS(array, start, PIndex - 1);
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QS(array, PIndex + 1, end);
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}
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}
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/**
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* This method finds the partition index for an array
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*
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* @param array The array to be sorted
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* @param start The first index of an array
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* @param end The last index of an array
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* Finds the partition index of an array
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**/
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public static <T extends Comparable<T>> int partition(T array[], int start, int end) {
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T pivot = array[end];
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int PIndex = start;
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for (int i=start;i<end;i++) {
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if (array[i].compareTo(pivot) <= 0) {
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swap(array, i, PIndex);
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PIndex++;
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}
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}
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swap(array, PIndex, end);
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return PIndex;
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}
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/**
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* This method swaps two elements of an array
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*
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* @param array The array to be sorted
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* @param initial The first element
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* @param fin The second element
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* Swaps initial and fin element
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**/
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public static <T extends Comparable<T>> void swap(T[] array, int initial, int fin) {
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T temp = array[initial];
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array[initial] = array[fin];
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array[fin] = temp;
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}
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// Driver Program
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public static void main(String[] args) {
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// For integer input
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int[] arr = {3,4,1,32,0,2,44,111,5};
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Integer[] array = new Integer[arr.length];
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for (int i=0;i<arr.length;i++) {
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array[i] = arr[i];
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}
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QS(array, 0, arr.length-1);
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//Output => 0 1 2 3 4 5 32 44 111
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for (int i=0;i<array.length;i++) {
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System.out.print(array[i] + " ");
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}
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System.out.println();
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// String Input
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String[] array1 = {"c", "a", "e", "b","d"};
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QS(array1, 0,array1.length-1);
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//Output => a b c d e
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for(int i=0; i<array1.length; i++)
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{
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System.out.print(array1[i]+"\t");
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}
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}
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}
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@ -1,102 +0,0 @@
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import java.util.Scanner;
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/**
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* Implementation of QuickSort
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*
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* @author Unknown
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*
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*/
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public class Quicksort{
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/**
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* The main method
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*
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* @param args Command line arguments
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*/
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public static void main(String[] args){
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Scanner input = new Scanner(System.in);
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int[] array;
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int size = 0;
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//Prompt user to create array and its elements
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System.out.print("Enter the size of the array: ");
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size = input.nextInt();
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array = new int[size];
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for (int i = 0; i < size; i++){
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System.out.print("For index " + i + ", give an integer input: ");
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array[i] = input.nextInt();
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}
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//Output inputted array
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System.out.println("The array is: ");
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printarray(array);
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System.out.println();
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//Run quicksort, and output sorted array
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quicksort(array, 0, array.length - 1);
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System.out.println("The sorted array is: ");
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printarray(array);
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System.out.println();
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input.close();
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}
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/**
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* QuickSort method
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*
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* @param ar Array to perform QuickSort
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* @param start Start of the array
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* @param end End of the array
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*/
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public static void quicksort(int[] ar, int start, int end){
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int[] array;
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int i = start, j = end;
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if (end-start >= 1){
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int pivot = ar[end];
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while (i< j){
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while (ar[i]<pivot && i<end){
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i++;
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}
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while (ar[j]>=pivot && j>start){
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j--;
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}
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if (i<j){
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swap(ar, i, j);
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}
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} swap(ar, end, i);
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quicksort(ar, start, i-1);
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quicksort(ar, i+1, end);
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} else{
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return;
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}
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}
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/**
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* Helper Method 1 - Swaps elements of an array
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*
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* @param ar Array to be used
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* @param index1 Index 1 to be switched with Index 2
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* @param index2 Index 2 to be switched with Index 1
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*/
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public static void swap(int[] ar, int index1, int index2){
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int temp = ar[index1];
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ar[index1] = ar[index2];
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ar[index2] = temp;
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}
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/**
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* Helper Method 2 - Prints the elements of an array
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*
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* @param array Array to be printed
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*/
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public static void printarray(int[] array){
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for (int data : array){
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System.out.print(data + " ");
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}
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}
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}
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