下列Python快速排序算法的横线处应填入的正确代码是?
def quick(arr):
if len(arr) <= 1:
return arr
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left = [x for x in arr if x < p]
middle = [x for x in arr if x == p]
right = [x for x in arr if x > p]
return quick(left) + middle + quick(right)
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