生成一段PBA排序算法的代码

以下是一段基于PBA排序算法的Python代码示例：

def pba_sort(arr):
    n = len(arr)
    p = [i for i in range(n)]
    s = [0] * n
    for i in range(n):
        for j in range(i+1, n):
            if arr[i] > arr[j]:
                s[p[i]] += 1
            else:
                s[p[j]] += 1
    for k in range(n):
        i = 0
        while s[i] != 0:
            i += 1
        s[i] = -1
        j = p[i]
        arr[k] = arr[j]
        p[i] = p[j]
        s[j] = 0
        for j in range(i+1, n):
            if arr[i] > arr[j]:
                s[p[i]] += 1
            else:
                s[p[j]] += 1
    return arr

该算法的时间复杂度为 $O(n^2)$，适用于小规模数据的排序。