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.Â
Java
// Java Program to implement// Odd-Even / Brick Sortimport java.io.*;Â
class GFG {Â Â Â Â public static void oddEvenSort(int arr[], int n)Â Â Â Â {Â Â Â Â Â Â Â Â boolean isSorted = false; // Initially array is unsortedÂ
        while (!isSorted) {            isSorted = true;            int temp = 0;Â
            // 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;                }            }Â
            // 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;                }            }        }Â
        return;    }    public static void main(String[] args)    {        int arr[] = { 34, 2, 10, -9 };        int n = arr.length;Â
        oddEvenSort(arr, n);        for (int i = 0; i < n; i++)            System.out.print(arr[i] + " ");Â
        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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