1. 图解

2， 代码

from typing import List


class Solution:
    # 快速排序
    def quick_sort(self, nums: List[int]) -> List[int]:
        less = list()
        more = list()
        cur = list()

        # 递归出口
        if len(nums) < 1:
            return nums
        else:
            # 将第一个值作为基准
            pivot = nums[0]
            for num in nums:
                # 将比基准值小的放到less 数列
                if num < pivot:
                    less.append(num)
                elif num > pivot:
                    more.append(num)
                else:
                    cur.append(num)
            less = self.quick_sort(less)
            more = self.quick_sort(more)
            return less + cur + more


if __name__ == "__main__":
    s = Solution()
    nums = [3,4,2,1,3,4,5,67,19]
    a = s.quick_sort(nums)
    print(a)