快速排序的partition版本实现

int partition(int arr[], int low, int high)  
{  
    int pivot = arr[high];  
    int i = low-1;  
    for (int j = low; j < high; j++)  
    {  
        if(arr[j] <= pivot)  
        {  
            i++;  
            swap(arr[i], arr[j]);  
        }  
    }  
    swap(arr[i+1],arr[high]);  
    return i+1;  
}  
void quickSort(int arr[], int low, int high)  
{  
    if(low < high)  
    {  
        int mid = partition(arr, low, high);   
        quickSort(arr, low, mid-1);  
        quickSort(arr, mid+1, up);  
    }  
}