归并排序

/************************************************************************/
/*Shell Sort                                                            */
/************************************************************************/

#include <iostream>
#include <time.h>
#include "Timer.h"
using namespace std;

#define Swap(x, y) {int temp = x; x = y; y = temp;}

const int MAX = 100000;
int* auxiliary = new int[MAX];

void Input(int* numbers)
{
	srand((unsigned)time(NULL));

	for (int i = 0; i < MAX; i++)
	{
		numbers[i] = rand() % (MAX * 10);
	}
}

void Output(int* numbers)
{
	for (int i = 1; i <= MAX; i++)		
	{
		cout << numbers[i-1] << " ";

		if (0 == i % 10)
		{
			cout << endl;
		}
	}

	cout << endl;
}

void Merge(int* numbers, int low, int mid, int high)
{
	int i = low;
	int j = mid + 1;
	int k = low;

	while (i <= mid && j <= high)
	{
		if (numbers[i] < numbers[j])
		{
			auxiliary[k++] = numbers[i++];
		}
		else
		{
			auxiliary[k++] = numbers[j++];
		}
	}

	//对未处理完的序列进行收尾处理
	if (i <= mid)
	{
		while (i <= mid)
		{
			auxiliary[k++] = numbers[i++];
		}
	}
	else
	{
		while (j <= high)
		{
			auxiliary[k++] = numbers[j++];
		}
	}

	for (int i = low; i <= high; i++)
	{
		numbers[i] = auxiliary[i];
	}
}

void MergeSort(int* numbers, int low, int high)
{
	if (low < high)
	{
		int mid = (low + high) / 2;

		MergeSort(numbers, low, mid);
		MergeSort(numbers, mid+1, high);
		Merge(numbers, low, mid, high);
	}
}

void main()
{
	//int num[MAX];
	int* num = new int[MAX];
	Input(num);

	cout << "Bubble before: " << endl;
	//Output(num);
	
	
	Timer timer;
	MergeSort(num, 0, MAX-1);
	cout <<"\nTime Elapsed: " << timer.GetElapsedTime() << "s" << endl;

	cout << "\nBubble after: " << endl;
	//Output(num);

	delete[] num;
	delete[] auxiliary;
}