希尔排序

package com.insert;

import java.util.Arrays;

/**
 * 希尔排序
 * 
 * @author wanjn
 *
 */
public class ShellSort {
    public static void main(String[] args) {
        int[] a = { 50, 3, 6, 1, 7, 9, 6, 2, 23, 5, 7, 234, 34, 6, 2, 7, 99,
                65, 3, 5, 675, 23 };
        int[] b = { 9, 5, 1 };
        System.out.println(Arrays.toString(shellInsertSort(a, b)));
        ;
    }

    private static int[] shellInsertSort(int[] a, int[] b) {
        int temp;
        int j;
        int addIndex;
        //可以和直接插入排序代码类比，基本上相同，只是比较一次移动的范围是一个增量序列
        for (int k = 0; k < b.length; k++) {
            //增量序列
            addIndex = b[k];
            for (int i = addIndex; i < a.length; i++) {
                temp = a[i];
                for (j = i - addIndex; j >= 0 && temp < a[j]; j-=addIndex) {
                    a[j + addIndex] = a[j];
                }
                a[j + addIndex] = temp;
            }
        }
        return a;
    }
}