LeetCode 75. Sort Colors--Python解法

题目地址：Sort Colors - LeetCode

Given an array with n objects colored red, white or blue, sort them in-place so that objects of the same color are adjacent, with the colors in the order red, white and blue.

Here, we will use the integers 0, 1, and 2 to represent the color red, white, and blue respectively.

Note: You are not suppose to use the library’s sort function for this problem.

Example:

Input: [2,0,2,1,1,0]
Output: [0,0,1,1,2,2]

Follow up:

A rather straight forward solution is a two-pass algorithm using counting sort.
First, iterate the array counting number of 0’s, 1’s, and 2’s, then overwrite array with total number of 0’s, then 1’s and followed by 2’s.
Could you come up with a one-pass algorithm using only constant space?

这道题目很简单，就是排序

Python解法如下：

class Solution:def sortColors(self, nums: List[int]) -> None:"""Do not return anything, modify nums in-place instead."""if nums==[]:returna = [0, 0, 0]j = 0for i in nums:a[i] += 1for i in range(0, len(nums)):while a[j] <= 0:j += 1nums[i] = ja[j] -= 1

太简单了，其他解法就不写了。

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