算法--快排

Posted 2020-12-14 libbin

核心：对于增序，目标值target左边元素的值都小于target，右边元素的值都大于target，然后使用递归的方式使得每一位元素都有序

def quicksort(nums:List[int], left:int, right:int):
    if left < right:
        # 为了方便，一般以左边元素为target，更好地方式的随机位置
        target = nums[left]
        low, high = left, right
        while low < high:
            while target <= nums[high] and low < high:
                high -= 1
            nums[low] = nums[high]
            while target >= nums[low] and low < high:
                low += 1
            nums[high] = nums[low]
            
        nums[low] = target
        quicksort(nums, left, low - 1)
        quicksort(nums, low + 1, right)