代码如下，快排采用分治的思想

python">def quick(arr,f,l):
    if f >= l:
        return
    else:
        i = f - 1
        for j in range(f,l):
            if arr[j] <= arr[l]:
                i += 1
                arr[i], arr[j] = arr[j],arr[i]
        arr[i+1] , arr[l] = arr[l],arr[i+1]
        quick(arr,f,i)
        quick(arr,i+1,l)

arr=[0,8,6,5,8,9,4,7]
quick(arr,0,7)
print(arr)