32일: 셰이커 정렬

import java.util.Random;



public class Day32 

{
    public static void printSequence(int[] sorted_sequence) 

    {

        for (int i = 0; i < sorted_sequence.length; i++)

            System.out.print(sorted_sequence[i] + " ");

    }

    public static int[] shakerSort(int[] array) {

        for (int i = 0; i < array.length/2; i++) {

            boolean swapped = false;

            for (int j = i; j < array.length - i - 1; j++) {

                if (array[j] < array[j+1]) {

                    int tmp = array[j];

                    array[j] = array[j+1];

                    array[j+1] = tmp;

                }

            }

            for (int j = array.length - 2 - i; j > i; j--) {

                if (array[j] > array[j-1]) {

                    int tmp = array[j];

                    array[j] = array[j-1];

                    array[j-1] = tmp;

                    swapped = true;

                }

            }

            if(!swapped) break;

        }

        return array;
    }

    public static void main(String args[]) 

    {

        System.out

                .println("Sorting of a randomly generated array with shaker sort");

        Random random = new Random();

        int N = 20;

        int[] sequence = new int[N];



        for (int i = 0; i < N; i++)

            sequence[i] = Math.abs(random.nextInt(100));

        System.out.println("\nOriginal: ");
        printSequence(sequence);

        System.out.println("\nSorted: ");
        printSequence(shakerSort(sequence));

    }
}