# include <stdio.h>
# include <malloc.h>

void Quicksort(int * a, int low, int high);
int FindPos(int * a, int loe, int high);

int main()
{
    int i;
    int len;
    int *a;

    printf("输入需要排序的个数:");
    scanf("%d",&len);
    a = (int *)malloc(sizeof(int)*len);
     for (i = 0; i < len; i++)
     {
       scanf("%d",&a[i]);
     }
    Quicksort(a , 0, len-1);/* 0 表示第一个元素的下标， len-1 表示最后一个元素的下标*/

    for (i = 0; i < len; i++)
        printf("%d ", a[i]);
    puts("\n");


    return 0;
}

void Quicksort(int * a, int low, int high)
{
    int pos;
    if (low < high)
    {
        pos = FindPos(a, low, high);
        Quicksort(a, low, pos-1);
        Quicksort(a, pos+1, high);
    }
}

int FindPos(int * a, int low, int high)
{
    int val = a[low];

    while (low < high)
    {
        while (low < high && a[high] >= val)
            --high;
        a[low] = a[high];

        while (low < high && a[high] <= val)
          low++;
        a[high] = a[low];
    }/*终止 while 循环之后， low 和 high 是相等的*/

    a[low] = val;
    return high; /* high 可以改成 low， 但不能改成 val, a[low], a[high]*/
}


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