LeetCode Remove Duplicates from Sorted Array II移掉重复数值

Remove Duplicates from Sorted Array II

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

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].

只要能记住重复出现多少次，就可以了。

增加一个c记录，出现两次的时候，继续出现的数值就跳过，不填写了。

很简单的一道题目。

class Solution {
public:
	int removeDuplicates(int A[], int n) {
		if (n == 0) return 0;
		int i = 0, j = 1, c = 1;

		for ( ; j<n; j++)
		{
			if (A[j] == A[j-1]) c++;
			else c = 1;
			if (c <= 2) A[++i] = A[j];
		}
		return i+1;
	}
};

//2014-2-12 update
	int removeDuplicates(int A[], int n) 
	{
		int i = 1, j = 1, c = 0;
		for (; j < n; j++)
		{
			if (A[j] != A[j-1])
			{
				c = 0;
				A[i++] = A[j];
			}
			else if (!c)
			{
				c++;
				A[i++] = A[j];
			}
		}
		return n? i:0;
	}