【LeetCode with Python】 Remove Duplicates from Sorted Array II

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原题页面： https://oj.leetcode.com/problems/remove-duplicates-from-sorted-array-ii/
题目类型：
难度评价：★

本文地址：http://blog.youkuaiyun.com/nerv3x3/article/details/38929163

Follow up for "Remove Duplicates":

What if duplicates are allowed at most twice?

For example,
Given sorted array nums = [1,1,1,2,2,3],

Your function should return length = 5, with the first five elements of nums being 1, 1, 2, 2 and 3. It doesn't matter what you leave beyond the new length.

class Solution:
    # @param a list of integers
    # @return an integer
    def removeDuplicates(self, A):
        if None == A:
            return 0
        len_A = len(A)
        if len_A <= 1:
            return len_A
        
        m = 0
        n = 1
        count = 1
        while n < len_A:
            if A[m] != A[n]:
                count = 1
                m += 1
                if m != n:
                    A[m] = A[n]
            elif count >= 2:
                count += 1
            else:
                m += 1
                count += 1
                if m != n:
                    A[m] = A[n]
            n += 1
        A = A[0:m+1]    # A must be modified
        return m + 1