python: 经典排序 汇总

冒泡排序

def bubble_sort(x):
    for i in range(len(x)):
        for j in range(1, len(x)-i):
            if x[j-1] > x[j]:
                x[j-1], x[j] = x[j], x[j-1]
    return x

插入排序

def insert_sort(x):
    for i in range(len(x)):
        for j in range(i):
            if x[i] < x[j]:
                tmp = x[i]
                for p in range(i, j, -1):
                    x[p] = x[p-1]
                x[j] = tmp
    return x

选择排序

def select_sort(x):
    for i in range(len(x)):
        for j in range(i+1, len(x)):
            if x[i] > x[j]:
                x[i], x[j] = x[j], x[i]
    return x

归并排序

def merge(left, right):
    i, j, res = 0, 0, []
    while i < len(left) and j < len(right):
        if left[i] <= right[j]:
            res.append(left[i])
            i += 1
        else:
            res.append(right[j])
            j += 1
    res += left[i:] or right[j:]
    return res
def merge_sort(x):
    if len(x) <= 1:
        return x
    mid = len(x) // 2
    left = merge_sort(x[:mid])
    right = merge_sort(x[mid:])
    return merge(left, right)

快速排序

def quick_sort(x, low, high):
    if low >= high:
        return x
    base, left, right = x[low], low, high
    while left < right:
        while left < right and x[right] >= base:
            right -= 1
        x[left] = x[right]
        while left < right and x[left] <= base:
            left += 1
        x[right] = x[left]
    x[left] = base
    quick_sort(x, low, left-1)
    quick_sort(x, left+1, high)
    return x

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