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博客域名： http://www.xnerv.wang
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/39453377

Follow up for "Remove Duplicates":
What if duplicates are allowed at most twice?

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

Your function should return length = 5, and A is now [1,1,2,2,3].

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