【python】快排的三種實現

def quick_sort(x, low, high):
    if len(x) <= 1 or low >= high:
        return x
    base, l, r = x[low], low, high
    while l < r:
        while l < r and x[r] >= base:
            r -= 1
        x[l] = x[r]
        while l < r and x[l] <= base:
            l += 1
        x[r] = x[l]
    x[l] = base
    quick_sort(x, low, l-1)
    quick_sort(x, l+1, high)
    return x

def qsort(x):
    if not x:
        return []
    base = x[0]
    less = [ele for ele in x[1:] if ele < base]
    more = [ele for ele in x[1:] if ele >= base]
    return qsort(less) + [base] + qsort(more)

def quick_sort(x, low, high):
    if len(x) <= 1 or low >= high:
        return
    stack = [low, high]
    while stack:
        l, r = stack.pop(0), stack.pop(0)
        if l >= r:
            continue
        i = l - 1
        for j in range(l, r):
            if x[j] < x[r]:
                i += 1
                x[i], x[j] = x[j], x[i]
        x[i + 1], x[r] = x[r], x[i + 1]
        stack.extend([l, i, i + 2, r])