C ++ Shell sort

#include <iostream>
#include <time.h>
#include <sys/timeb.h>

using namespace std;

#define MAX 10000

void SortArr(int arr[],int length) {
	int i = 0, j = 0, k = 0;
	int interval = length;
	do
	{
		interval = interval / 3 + 1;//确定分组的增量
		for (i = 0; i < interval; i++)//分组
		{
			for (j = i+ interval; j < length; j+= interval)//分组后根据分组的增量来排序
			{
				if (arr[j]<arr[j-interval])//当前元素与根据分组的增量前元素比较
				{
					int temp = arr[j];
					for (k = j- interval; k >=0&& temp<arr[k]; k-= interval)//往当前元素的前面对比,直到比当前元素小
					{
						arr[k + interval] = arr[k];//满足条件则后移
					}
					arr[k + interval] = temp;//(不满足条件)在比当前元素小的元素的下一个位置插入
				}
			}
		}
	} while (interval>1);
	
}
void PrintArr(int arr[],int length) {
	for (int i = 0; i < length; i++)
	{
		cout << arr[i] << " ";
	}
	cout << endl;
}

long GetTime() {
	timeb t;
	ftime(&t);
	return t.time * 1000 + t.millitm;
}
int main() {

	srand((unsigned int)time(NULL));

	int arr[MAX];

	for (int i = 0; i < MAX; i++)
	{
		arr[i] = rand() % MAX;
	}

	//PrintArr(arr, MAX);

	long after = GetTime();
	SortArr(arr, MAX);
	long before = GetTime();
	//PrintArr(arr, MAX);

	cout << "希尔排序" << MAX << "次，耗时:" << before - after << "毫秒" << endl;//1毫秒
	return 0;
}

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