快速排序（非递归）

以下代码经测试，排序5000000（五千万）int型数据没有问题！

第一个参数是数组首地址
第二个参数是数组元素个数

typedef struct _BUFF {    int *LeftBuff;    int *RightBuff;    DWORD number;//有多少个    struct _BUFF *next;}BUFF;void QuickSort(int * const arr, DWORD number)//快速排序{    int tmp;    int key;    DWORD left, right;    DWORD tmpLeft, tmpRight;    BUFF *p = NULL;    BUFF buff = {NULL, NULL, 0, NULL};    buff.LeftBuff = (int *)malloc(1024*1024*sizeof (int));    buff.RightBuff = (int *)malloc(1024*1024*sizeof (int));    if ((NULL == buff.LeftBuff) || (NULL == buff.LeftBuff))    {        free(buff.LeftBuff);        free(buff.LeftBuff);        printf("分配缓存出错！\n");        return;    }    buff.LeftBuff[buff.number] = 0;    buff.RightBuff[buff.number] = number-1;    buff.number++;    p = &buff;    while (buff.number/* && (NULL == buff.next)*/)    {        tmpLeft = p->LeftBuff[p->number-1];        tmpRight = p->RightBuff[p->number-1];        left = tmpLeft;        right = tmpRight;        key = arr[left++];        do        {            while ((arr[left] < key) && (left < tmpRight))            {                left++;            }            while ((arr[right] >= key) && (right > tmpLeft))            {                right--;            }            if (left < right)            {                tmp = arr[left];                arr[left] = arr[right];                arr[right] = tmp;            }        }        while (left < right);        tmp = arr[right];        arr[right] = arr[tmpLeft];        arr[tmpLeft] = tmp;        if (p->number >= 1024*1024-1)        {            p->next = (BUFF *)malloc(sizeof (BUFF));            if (NULL != p->next)            {                p = p->next;                p->LeftBuff = (int *)malloc(1024*1024*sizeof (int));                p->RightBuff = (int *)malloc(1024*1024*sizeof (int));                p->number = 0;                p->next = NULL;            }            if ((0 != p->number) || (NULL == p->LeftBuff) || (NULL == p->RightBuff))            {                printf("分配缓存出错！\n");                while (NULL != buff.next)                {                    p = buff.next;                    do                    {                        p = p->next;                    }                    while (NULL != p->next);                    free(p);                }                getch();                return;            }        }        else        {            p->number--;        }        if (tmpLeft+1 < right)        {            p->LeftBuff[p->number] = tmpLeft;            p->RightBuff[p->number] = right-1;            p->number++;        }        if (tmpRight > left)        {            p->LeftBuff[p->number] = left;            p->RightBuff[p->number] = tmpRight;            p->number++;        }        if ((0 == p->number) && (NULL != buff.next))        {            p = &buff;            while (NULL == p->next->next)            {                p = p->next;            }            free(p->next);            p->next = NULL;        }    }}

测试代码：

#include <stdio.h>#include <conio.h>#include <windows.h>typedef struct _BUFF {    int *LeftBuff;    int *RightBuff;    DWORD number;//有多少个    struct _BUFF *next;}BUFF;void QuickSort(int * const arr, DWORD number);//快速排序void ExamineArr(const int * const arr, DWORD number);//检查排序结果int main(int argc, char *argv[]){    DWORD StartTime, EndTime;    DWORD i;    DWORD num = 50000000;    int *arr = NULL;    arr = (int *)malloc(num * sizeof (int));    if (NULL == arr)    {        free(arr);        printf("内存分配失败，程序退出！\n");        getch();        return -1;    }    StartTime = GetTickCount();    for (i=0; i<num; i++)    {        *(arr+i) = rand();    }    EndTime = GetTickCount();    printf("生成%u个随机数耗时：%ums\n", num, EndTime - StartTime);        StartTime = GetTickCount();    QuickSort(arr, num);    EndTime = GetTickCount();    printf("快速排序耗时：%ums\n", EndTime - StartTime);    ExamineArr(arr, num);//检查排序结果    free(arr);    getch();    return 0;}void QuickSort(int * const arr, DWORD number)//快速排序{    int tmp;    int key;    DWORD left, right;    DWORD tmpLeft, tmpRight;    BUFF *p = NULL;    BUFF buff = {NULL, NULL, 0, NULL};    buff.LeftBuff = (int *)malloc(1024*1024*sizeof (int));    buff.RightBuff = (int *)malloc(1024*1024*sizeof (int));    if ((NULL == buff.LeftBuff) || (NULL == buff.LeftBuff))    {        free(buff.LeftBuff);        free(buff.LeftBuff);        printf("分配缓存出错！\n");        return;    }    buff.LeftBuff[buff.number] = 0;    buff.RightBuff[buff.number] = number-1;    buff.number++;    p = &buff;    while (buff.number/* && (NULL == buff.next)*/)    {        tmpLeft = p->LeftBuff[p->number-1];        tmpRight = p->RightBuff[p->number-1];        left = tmpLeft;        right = tmpRight;        key = arr[left++];        do        {            while ((arr[left] < key) && (left < tmpRight))            {                left++;            }            while ((arr[right] >= key) && (right > tmpLeft))            {                right--;            }            if (left < right)            {                tmp = arr[left];                arr[left] = arr[right];                arr[right] = tmp;            }        }        while (left < right);        tmp = arr[right];        arr[right] = arr[tmpLeft];        arr[tmpLeft] = tmp;        if (p->number >= 1024*1024-1)        {            p->next = (BUFF *)malloc(sizeof (BUFF));            if (NULL != p->next)            {                p = p->next;                p->LeftBuff = (int *)malloc(1024*1024*sizeof (int));                p->RightBuff = (int *)malloc(1024*1024*sizeof (int));                p->number = 0;                p->next = NULL;            }            if ((0 != p->number) || (NULL == p->LeftBuff) || (NULL == p->RightBuff))            {                printf("分配缓存出错！\n");                while (NULL != buff.next)                {                    p = buff.next;                    do                    {                        p = p->next;                    }                    while (NULL != p->next);                    free(p);                }                getch();                return;            }        }        else        {            p->number--;        }        if (tmpLeft+1 < right)        {            p->LeftBuff[p->number] = tmpLeft;            p->RightBuff[p->number] = right-1;            p->number++;        }        if (tmpRight > left)        {            p->LeftBuff[p->number] = left;            p->RightBuff[p->number] = tmpRight;            p->number++;        }        if ((0 == p->number) && (NULL != buff.next))        {            p = &buff;            while (NULL == p->next->next)            {                p = p->next;            }            free(p->next);            p->next = NULL;        }    }}void ExamineArr(const int * const arr, DWORD number){    DWORD i=0, j=1;    if (number <2)    {        return;    }    for (; j<number; i++,j++)    {        if (arr[i] > arr[j])        {            printf("第%u个数大于第%u个数！\n", i, j);            return;        }    }}