20200628 快速排序算法

快速排序算法

def quick_sort(collection):
    """Pure implementation of quick sort algorithm in Python

    :param collection: some mutable ordered collection with heterogeneous
    comparable items inside
    :return: the same collection ordered by ascending

    Examples:
    >>> quick_sort([0, 5, 3, 2, 2])
    [0, 2, 2, 3, 5]

    >>> quick_sort([])
    []

    >>> quick_sort([-2, -5, -45])
    [-45, -5, -2]
    """
    length = len(collection)
    if length <= 1:
        return collection
    else:
        # Use the last element as the first pivot 选基线
        pivot = collection.pop()
        # Put elements greater than pivot in greater list
        # Put elements lesser than pivot in lesser list
        greater, lesser = [], []
        for element in collection:
            if element > pivot:
                greater.append(element)
            else:
                lesser.append(element)
        return quick_sort(lesser) + [pivot] + quick_sort(greater)

LeetCode 刷题拓展

https://cloud.tencent.com/developer/column/78755