如何调整迭代数组的函数？

def adjust_array(arr):
    n = len(arr)
    for i in range(n-1):
        for j in range(i+1, n):
            if arr[i] < arr[j]:
                arr[i], arr[j] = arr[j], arr[i]
    return arr

arr = [4, 2, 9, 1, 6]
result = adjust_array(arr)
print(result)

[9, 6, 4, 2, 1]

def adjust_array(arr):
    return sorted(arr)

arr = [4, 2, 9, 1, 6]
result = adjust_array(arr)
print(result)

[1, 2, 4, 6, 9]

def adjust_array(arr):
    if len(arr) <= 1:
        return arr
    pivot = arr[len(arr)//2]
    left = [x for x in arr if x < pivot]
    middle = [x for x in arr if x == pivot]
    right = [x for x in arr if x > pivot]
    return adjust_array(left) + middle + adjust_array(right)

arr = [4, 2, 9, 1, 6]
result = adjust_array(arr)
print(result)

[1, 2, 4, 6, 9]