From 0607bf9b474708e3f787471f6221990cd6648b90 Mon Sep 17 00:00:00 2001
From: JadenLeake333 <47929127+JadenLeake333@users.noreply.github.com>
Date: Sat, 30 Oct 2021 04:39:37 -0400
Subject: [PATCH] Add Odd-Even Sort (#2765)

---
 Sorts/OddEvenSort.java | 67 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)
 create mode 100644 Sorts/OddEvenSort.java

diff --git a/Sorts/OddEvenSort.java b/Sorts/OddEvenSort.java
new file mode 100644
index 000000000..160746c15
--- /dev/null
+++ b/Sorts/OddEvenSort.java
@@ -0,0 +1,67 @@
+package Sorts;
+
+import java.util.Random;
+
+// https://en.wikipedia.org/wiki/Odd%E2%80%93even_sort
+public class OddEvenSort {
+
+    public static void main(String[] args) {
+        int[] arr = new int[100];
+
+        Random random = new Random();
+
+        // Print out unsorted elements
+        for (int i = 0; i < arr.length; ++i) {
+            arr[i] = random.nextInt(100) - 50;
+            System.out.println(arr[i]);
+        }
+        System.out.println("--------------");
+
+        oddEvenSort(arr);
+
+        //Print Sorted elements
+        for (int i = 0; i < arr.length - 1; ++i) {
+            System.out.println(arr[i]);
+            assert arr[i] <= arr[i + 1];
+        }
+    }
+
+    /**
+     * Odd Even Sort algorithms implements
+     *
+     * @param arr the array contains elements
+     */
+    public static void oddEvenSort(int[] arr) {
+        boolean sorted = false;
+        while(!sorted) {
+            sorted = true;
+
+            for(int i = 1; i < arr.length-1; i += 2){
+                if (arr[i] > arr [i + 1]){
+                    swap(arr, i, i+1);
+                    sorted = false;
+                }
+            }
+
+            for (int i = 0; i < arr.length - 1; i+= 2){
+                if( arr[i] > arr[i + 1] ){
+                    swap(arr, i, i+1);
+                    sorted = false;
+                }
+            }
+        }
+    }
+
+    /**
+     * Helper function to swap two array values.
+     *
+     * @param arr the array contains elements
+     * @param i the first index to be swapped
+     * @param j the second index to be swapped
+     */
+    private static void swap(int[] arr, int i, int j) {
+        int temp = arr[i];
+        arr[i] = arr[j];
+        arr[j] = temp;
+    }
+}
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