LeetCode 80. Remove Duplicates from Sorted Array II（删除重复）

原题网址：https://leetcode.com/problems/remove-duplicates-from-sorted-array-ii/

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.

方法：直接扫描。

public class Solution {
    public int removeDuplicates(int[] nums) {
        if (nums.length <= 2) return nums.length;
        int len = 2;
        for(int i=2; i<nums.length; i++) {
            if (nums[i] != nums[len-1] || nums[i] != nums[len-2]) nums[len++] = nums[i];
        }
        return len;
    }
}