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Java Program for Odd-Even Sort / Brick Sort

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  • Last Updated : 31 May, 2022

This is basically a variation of bubble-sort. This algorithm is divided into two phases- Odd and Even Phase. The algorithm runs until the array elements are sorted and in each iteration two phases occurs- Odd and Even Phases. In the odd phase, we perform a bubble sort on odd indexed elements and in the even phase, we perform a bubble sort on even indexed elements. 

Java




// Java Program to implement
// Odd-Even / Brick Sort
import java.io.*;
 
class GFG {
    public static void oddEvenSort(int arr[], int n)
    {
        boolean isSorted = false; // Initially array is unsorted
 
        while (!isSorted) {
            isSorted = true;
            int temp = 0;
 
            // Perform Bubble sort on odd indexed element
            for (int i = 1; i <= n - 2; i = i + 2) {
                if (arr[i] > arr[i + 1]) {
                    temp = arr[i];
                    arr[i] = arr[i + 1];
                    arr[i + 1] = temp;
                    isSorted = false;
                }
            }
 
            // Perform Bubble sort on even indexed element
            for (int i = 0; i <= n - 2; i = i + 2) {
                if (arr[i] > arr[i + 1]) {
                    temp = arr[i];
                    arr[i] = arr[i + 1];
                    arr[i + 1] = temp;
                    isSorted = false;
                }
            }
        }
 
        return;
    }
    public static void main(String[] args)
    {
        int arr[] = { 34, 2, 10, -9 };
        int n = arr.length;
 
        oddEvenSort(arr, n);
        for (int i = 0; i < n; i++)
            System.out.print(arr[i] + " ");
 
        System.out.println(" ");
    }
}
// Code Contribute by Mohit Gupta_OMG <(0_o)>

Output:

-9 2 10 34

Time Complexity : O(N2) where, N = Number of elements in the input array.
Auxiliary Space : O(1). This is an in-place algorithm, so no extra space is required.

Please refer complete article on Odd-Even Sort / Brick Sort for more details!


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