80.Remove Duplicates from Sorted Array II

思路：

• 两个指针，比Remove Duplicates from Sorted Array多了一个count,记录是否超过两次。直接贴代码。

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        if(nums.size() <= 2) return nums.size();
        int pre = 0,count = 1;
        for(int i = 0; i < nums.size()-1; i++){
            if(nums[i] == nums[i+1]){
                if(count < 2){
                    count++;
                    pre++;
                    nums[pre] = nums[i];
                }
            }else if(nums[i] != nums[i+1]){
                count = 1;
                pre++;
                nums[pre] = nums[i+1];
            }
        }
        return pre+1;
    }
};